Make iOS FlutterViewController stop sending inactive/pause on app lifecycle events when not visible (#12128)

Makes the plugin registration structure consistent with macOS. This will
be used in generated plugin registrant files rather than a specific
implemenation class, so this helps unblock the creation of generated
registrants on Windows and Linux.

Per kenzieschmoll's request.

Will update https://github.com/flutter/flutter/wiki/Engine-specific-Service-Protocol-extensions once this is merged.

- The build command supports a `--watch` or `-w` flag to watch for
changes and rebuild.

Fixes https://github.com/flutter/flutter/issues/40392

https://skia.googlesource.com/skia.git/+log/df432d5efb70..d545bfbb94ca

git log df432d5efb70..d545bfbb94ca --date=short --no-merges --format='%ad %ae %s'
2019-09-17 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps

Created with:
  gclient setdep -r src/third_party/skia@d545bfbb94ca

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TBR=brianosman@google.com

Roll fuchsia/sdk/core/linux-amd64 from rwf0-... to RRgw-...

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https://skia.googlesource.com/skia.git/+log/f8486f2c5fb6..df432d5efb70

git log f8486f2c5fb6..df432d5efb70 --date=short --no-merges --format='%ad %ae %s'
2019-09-17 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 48c8f915e06e..c6edebc270af (390 commits)

Created with:
  gclient setdep -r src/third_party/skia@df432d5efb70

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https://skia.googlesource.com/skia.git/+log/b47704b0bd34..f8486f2c5fb6

git log b47704b0bd34..f8486f2c5fb6 --date=short --no-merges --format='%ad %ae %s'
2019-09-17 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-17 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/skia@f8486f2c5fb6

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Fix the declaration of setSystemGestureExclusionRects to match the PlatformMessageHandler interface (#12306)

Manage resource and onscreen contexts using separate IOSGLContext objects.

FlutterView owns the onscreen context, and PlatformViewIOS owns the resource context.

Made flutter startup faster by allowing initialization to be parallelized.  This resulting in a 15% decrease in startup time (~0.05ms)

https://skia.googlesource.com/skia.git/+log/c22498502cda..b47704b0bd34

git log c22498502cda..b47704b0bd34 --date=short --no-merges --format='%ad %ae %s'
2019-09-16 brianosman@google.com Fix license comment in skottie_ios
2019-09-16 jvanverth@google.com Revert "Add ETC2 support to Metal backend."
2019-09-16 reed@google.com update videoencoder, add scale option, remove motion-blur hack
2019-09-16 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-16 halcanary@google.com experimental/skottie_ios: Skottie iOS/Metal App
2019-09-16 nifong@google.com Add a wasm debugger test that uses a WebGL surface
2019-09-16 kjlubick@google.com [canvaskit] Add test for skottie to catch framebuffer issues
2019-09-16 halcanary@google.com gn: split out iOS templates to gn/ios.gni
2019-09-16 jvanverth@google.com Add ETC2 support to Metal backend.
2019-09-16 brianosman@google.com Particle effect scripting update
2019-09-16 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-16 brianosman@google.com Fix precompiling shaders on GLES / Android
2019-09-16 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-16 halcanary@google.com BUILD/iOS-App: simplify bundle
2019-09-16 brianosman@google.com android_gdbserver: Don't fail when trying to locate nonexistent files
2019-09-16 nigeltao@google.com Remove a deprecated Wuffs io_buffer::reader call

Created with:
  gclient setdep -r src/third_party/skia@b47704b0bd34

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dart-lang/sdk@dd1969a43a [pkg/vm] Train kernel service differently
dart-lang/sdk@41ad840e48 [dart2js] Fix constant folding of overflowing truncating divide

For https://github.com/flutter/flutter/issues/32170

This is to enable reading back SkSL persistent cache filenames
and decode them as SkData.

Additionally, we now use the engine directly as a delegate instead of storing potentially dead runtime_controller.

Unit tests have been updated to include an engine restart check which would fail before the fix.

This fixes https://github.com/flutter/flutter/issues/40303

1. Various functionalities offered by this tool are now organized into commands (e.g. `felt test`, `felt check-licenses`).
2. The felt tool can now be invoked from anywhere, not necessarily from the web_ui directory.
3. This new structure helps us scale better as we add more commands (e.g. soon a `build/watch` command is coming).

dart-lang/sdk@7799f424f4 [CFE] Encapsulate int operations in separate classes for VM and JS
dart-lang/sdk@eb1a375749 [CFE] Consolidate double special cases for == and identical.
dart-lang/sdk@7b60ae1a0d [cfe] Fix infer expression

https://skia.googlesource.com/skia.git/+log/86c48abc94f3..c22498502cda

git log 86c48abc94f3..c22498502cda --date=short --no-merges --format='%ad %ae %s'
2019-09-16 bsalomon@google.com Mark last render target bound ID invalid after clearing texture levels using glClear

Created with:
  gclient setdep -r src/third_party/skia@c22498502cda

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Cf. dart-lang/sdk@74cff6c7df3e8f212c7f41a3a25631e007abc0f7

dart-lang/sdk@a8f433820b [fasta] Add test for split dill

Roll fuchsia/sdk/core/linux-amd64 from Ha3yC... to rwf0-...

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Roll fuchsia/sdk/core/mac-amd64 from tg1Em... to xPX7p...

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dart-lang/sdk@f8f0b845c2 [vm/bytecode] Fix lazy lookup of line starts with bytecode and app-jit
dart-lang/sdk@aa318ee261 Add Class/TypeParameter/FunctionTypeAliasElement.instantiate() methods.
dart-lang/sdk@4575e4df37 fix for UNUSED_LOCAL_VARIABLE
dart-lang/sdk@4512b22595 [vm/fuzzer] Call all virtual methods
dart-lang/sdk@f7638fc2fb [vm/fuzzer] Filter exponential assigments
dart-lang/sdk@f234830998 Cut dart:ffi dependency to fix simarm build
dart-lang/sdk@64d4fc59fe [vm/bytecode] Load referenced classes more efficiently
dart-lang/sdk@3e1154cb5b [vm/bytecode] Move CheckStack after function type arguments handling
dart-lang/sdk@bded2e015e [vm/fuzzer] fix newline when printing timeouts
dart-lang/sdk@8d7daafdaf [dart_internal] Bump SDK upper-bound to <2.7.0
dart-lang/sdk@7ee192e7c7 [vm/bytecode] Do not create bytecode CodeBreakpoint if interpreter is not enabled
dart-lang/sdk@330fccbc0d Implement extension override in summary2
dart-lang/sdk@08518a6d5e Stop using ClassElement.type and InterfacecType.instantiate in TypeSystem tests.
dart-lang/sdk@d53086e005 Fix strict-inference failure on ctor call to allow upwards dynamic
dart-lang/sdk@ed9e89ea38 Implement a basic WASM API using wasmer.
dart-lang/sdk@e8413cd08d Add a fix to allow unqualified references to static members to be qualified.

https://skia.googlesource.com/skia.git/+log/cb52badca04a..86c48abc94f3

git log cb52badca04a..86c48abc94f3 --date=short --no-merges --format='%ad %ae %s'
2019-09-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 b1580a276713..d32dae1bb37c (5 commits)
2019-09-16 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-09-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader adb0d51ca672..30847688f059 (2 commits)
2019-09-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 465489971eea..48c8f915e06e (416 commits)

Created with:
  gclient setdep -r src/third_party/skia@86c48abc94f3

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https://skia.googlesource.com/skia.git/+log/2cb1315d99e4..cb52badca04a

git log 2cb1315d99e4..cb52badca04a --date=short --no-merges --format='%ad %ae %s'
2019-09-15 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update SKP version
2019-09-15 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-09-14 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-14 reed@google.com Revert "add guard to switch to SkPathTypes"
2019-09-14 reed@google.com add guard to switch to SkPathTypes

Created with:
  gclient setdep -r src/third_party/skia@cb52badca04a

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This reverts commit 3f76f55b.

This reverts commit b73cfdad.

https://skia.googlesource.com/skia.git/+log/cf4deab60e30..2cb1315d99e4

git log cf4deab60e30..2cb1315d99e4 --date=short --no-merges --format='%ad %ae %s'
2019-09-13 khushalsagar@chromium.org Reland "gpu: Update GrGLCaps usage of fTextureRectangle with chromium."

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  gclient setdep -r src/third_party/skia@2cb1315d99e4

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Roll fuchsia/sdk/core/mac-amd64 from gVBCH... to tg1Em...

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Roll fuchsia/sdk/core/linux-amd64 from Xfeuz... to Ha3yC...

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This reverts commit 1a2c16b3.

Made the flutter view controllers dealloc notification more
generic and started turning off semantics when the view controller
is remotely deleted.

dart-lang/sdk@d0052c1b31 [dart:_http] Fix potentially large List<int> allocation in _WebSocketPerMessageDeflate.processIncomingMessage
dart-lang/sdk@4aa820bbf5 Reland "[vm/bytecode] Switch kernel service dill to bytecode if building Dart SDK with --bytecode"
dart-lang/sdk@f20f619050 Add 'variance' experimental flag.
dart-lang/sdk@139889e2b9 Fix a couple of diagnostic messages and re-order several constants to restore alphabetic ordering
dart-lang/sdk@daa22105fd More clean up for TypeSystem tests.
dart-lang/sdk@3129ad9585 Only report a non-const initializer for const variables; fixes #35985
dart-lang/sdk@f8f7a5a6c1 Migration: add a test case documenting the need for definite assignment integration
dart-lang/sdk@366b4056e6 Migration: add a test case documenting a problem with back-propagation of non-nullability
dart-lang/sdk@25401964ab Pass proper file URI under both Windows and not
dart-lang/sdk@f35f9e8e24 [kernel] Don't lazy load classes when dills are concatenated
dart-lang/sdk@b65120eae7 [vm/ffi] Update CSP after Enter/ExitSafepoint slow-path stubs on ARM64.
dart-lang/sdk@2a12c63631 [cfe] Use SuperPropertySet for super assignment
dart-lang/sdk@4b72fffaaf [cfe] Use VariableSet for variable assignment
dart-lang/sdk@2153a06b82 [cfe] Use PropertySet for property assignment
dart-lang/sdk@4fd7bf7356 [cfe] Split inference of super property get from instance property get
dart-lang/sdk@f8f37c131b [cfe] Split inference of super method invocation from instance method invocation
dart-lang/sdk@7d2ebd3ce9 [cfe] Introduce InternalExpression
dart-lang/sdk@2c6f779a76 [cfe] Remove legacyMode
dart-lang/sdk@392cd3b26f [cfe] Delete InferredTypeVisitor
dart-lang/sdk@71534fe18c [cfe] Make *Impl classes
dart-lang/sdk@15ccf4c703 [cfe] Remove unneeded Judgments
dart-lang/sdk@7985b187ab [cfe] Remove ExpressionJudgment.inferredType