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This allows the framework to know that a frame with the resized view is
ready and to behave deterministically to workaround the jank issue
described in flutter/flutter/19572

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It turns out that Skia is much slower at drawing paint inside a clipped
path than directly drawing that path. (Average frame time of 22ms vs
18ms in flutter_galary transition test.)

This is needed to avoid jank when resizing an embedded Android view.
See
https://github.com/flutter/flutter/issues/19572#issuecomment-410400724

* Updated DartCallbackCache to write callback cache to disk which is
restored on engine startup
* Ensure cache isn't moved off disk in iOS

See https://github.com/flutter/flutter/issues/18665

* Reland "Updated background execution implementation for Android" w/ JNI fixes for merge breakages

This reverts commit 5442c0a7.

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Until https://chromium-review.googlesource.com/c/chromium/tools/build/+/1164636
landed, we'll use this to unblock the Chrome bot.

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This reverts commit f20c58f6.

dart-lang/sdk@17b54c7 Improve error detection in search code
dart-lang/sdk@0ac1178 Initial stress test for code completion
dart-lang/sdk@e0f6fdf Refactor testing:TestConfiguration to use smith:Configuration by inclusion.
dart-lang/sdk@95d1ebd Fix one cause of timeouts in tests
dart-lang/sdk@72b2542 Mark tests with Dart 1 constants in const context failing in all configs.
dart-lang/sdk@42b02e0 Add more test steps to the analyzer --use-cfe bots.
dart-lang/sdk@8bec83b Add the analyzer-use-cfe-linux bot to the commit queue.
dart-lang/sdk@315216e [dart2js] Avoid collision with getInterceptor.
dart-lang/sdk@f02d4d4 Fix bad merge
dart-lang/sdk@1a83245 Triage language tests for void
dart-lang/sdk@35a982b [VM kernel] Add missing type parameter finalization in type reader.
dart-lang/sdk@09a8660 fix typo
dart-lang/sdk@8cbbd7a [VM interpreter] Use write barrier in implicit setter.
dart-lang/sdk@91caf82 Do self-interceptor optimization on a per-use basis
dart-lang/sdk@8df84c0 Store resolution for out of range integer literals.
dart-lang/sdk@bfa890d [vm/compiler] Various 64-bit operator improvements.
dart-lang/sdk@92a7094 Fix three missing return warnings.
dart-lang/sdk@1babc13 [vm/kernel/bytecode] Report compile-time errors from constant evaluation while generating bytecode
dart-lang/sdk@8114ecb Fix tests after fixing constant fields with CFE.
dart-lang/sdk@85edb76 Fix field constants verifying with CFE.
dart-lang/sdk@8692936 Verify constants using Analyzer.
dart-lang/sdk@b83072c Clean up use of callFailingTest
dart-lang/sdk@8d3d82a [vm/kernel] Untangle the spaghetti-code in BuildGraphOfFunction and fix bugs.
dart-lang/sdk@368bcc4 Add parse dartdoc tests for fasta parser
dart-lang/sdk@cda3659 [fasta] Handle annotations on formals of typedefs
dart-lang/sdk@46743f3 Remove $runtime == drt sections and uses of drt from status files.
dart-lang/sdk@637e55d [kernel] Add VariableDeclarations to represent formals of Typedefs
dart-lang/sdk@4c455e7 [VM] During hot-reload check if .packages was modified, tell IKG to re-load it if so
dart-lang/sdk@5a259ac De-flake the analysis server integration tests.
dart-lang/sdk@380696f Set element/type for some resynthesized expressions.
dart-lang/sdk@4ab8408 [vm/kernel/bytecode] Support partial tear-off instantiation constants in bytecode generator and bytecode reader
dart-lang/sdk@62a2752 Translate ConstructorElement(s) of parameterized InterfaceType(s) to ConstructorMember(s).
dart-lang/sdk@a19a468 Revise CHANGELOG.
dart-lang/sdk@91c6130 CHANGELOG copyedits
dart-lang/sdk@5f4c617 Fix typo in CHANGELOG.md
dart-lang/sdk@5313553 Run the analysis server 'analysis-server-cold' with --use-cfe.
dart-lang/sdk@758e5ea Use '=' for default values of named parameters.
dart-lang/sdk@f625490 Attempt to fix failures on the windows bot
dart-lang/sdk@bbfc465 Cleaned up a few entries in the CHANGELOG
dart-lang/sdk@e402732 Improve documentation of the -O flag

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This reflects that we no longer uses travis. Scripts are moved to ci folder.

This reverts commit bc885f31.

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The behavior of acquire+release annotation handling has changed in
https://reviews.llvm.org/D49355 which breaks the build with the new
Clang. However, as has been pointed out, the acquire+release isn't
the right way to prevent double locking as the annotations negate
each other; the correct way is to use excludes or negative requires.
Using excludes annotations also requires using std::lock_guard instead
of std::unique_lock because the latter doesn't have the thread
annotations due to deferred locking which is not needed in Flutter and
so std::lock_guard is a sufficient alternative.

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If we want to avoid the bleeding edge artifact (flutter/flutter#18057 (comment)) using saveLayer, we have to call drawPaint instead of drawPath as anti-aliased drawPath will always have such artifacts.

This is discovered when I try to add golden tests for such bleeding artifacts using our new Clip enum. Here's the updated golden files: flutter/goldens@cb1fa8a?short_path=57b30ce#diff-57b30cea9b10b7ca689009854e12d70e

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* Flush all embedded Android view on hot restart.

Adds an OnEngineRestarted method to PlatformView, this is currently only
implemented for Android where we need to use it for embedded views.

* review comments followup

* rename to OnPreEngineRestart, call before Clone

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Instead, send them with the new unknown PointerDeviceKind.

We hit this when running `adb shell input tap` in tests which sends events with
an unknown tool type.

This also fills in a missing conversion for TOOL_TYPE_ERASER.