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To keep the scope of this CL as small of possible I'm leaving the actual
implementation of the platform view mechanics to a following CL.

This CL introduces:
  * A PlatformViewsController class which will be responsible for creating,
    resizing, and disposing platform views.
  * A PlatformViewRegistry which is exposed through the PluginRegistry
    and allows plugins to register factories for platform views.

Android plugin code will add support for a new platform view type by
implementing PlatformViewFactory, and registering a factory with the
registry, e.g:
```java
registrar.platformViewRegistry().registerViewFactory(
  'webview',
  new FlutterWebViewFactory()
);
```
On the Dart side, the framework will ask the engine to create new
platform views by sending a create message over the platformviews method
channel with the unique platform view type id, dimensions, and a unique
id allocated by the framework for the new platform view instance.
The platformviews method channel is also used for resizing and disposing
platform views.

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Fixes https://github.com/flutter/flutter/issues/19214

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This caused failures in Flutter microbenchmarks.

See: flutter/flutter#19096 and flutter/flutter#19210

This reverts commit 4466d61a.

So our future pull requests won't be polluted by the white space changes.

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This is a reland of #5638. We removed the restoreToCount, made doAntiAlias named, and updated the comments.

* Roll dart to 84ca27a09ebd6a65cd23ee52d835d89cbe06c574.

Changes since last roll:
```
84ca27a09e Fix File::OpenUri on Windows.
5403f654ae Merge existing metadata into new incrementally compiled components.
3cc0a9a230 Another fix for a race in a test.
4aacaeb684 [vm/compiler] Fix handling of exception-throwing instructions in DSE
4ff4620f68 Adjust status lines for safari (take 2)
c5c18a0ace Introduce percent decoding in File::OpenUri.
550f294dfc Move some analysis to analyzer-analysis-server-linux and make analyzer-analysis-server-linux a try bot.
f5de04f4e1 Apply resolution to directive annotations.
6d328b7fc5 Correctly parse dartdoc before abstract class
25969b2af3 Store resolution for abstract class constructor invocation.
973f73b150 Handle invalid types from front end.
bab152a0a9 Fix default in gardening tools
007dcd415d Upgrade package:http to 0.11.3+17.
2519892295 Address a race condition in a test.
ed0ccc7ac9 Add more error message mappings
f0560a8d66 Add error code ArgumentTypeNotAssignable to improve messaging (issue 33712)
660b8b7700 [fuchsia] Update path to timezone service
acd8f345aa Update safari status
4ab082736b [gn] Remove dart_test_bootfs
1c673b1046 Include bounds in type literals
3a1b09dc63 Fix for bug #33660
810cdf8649 Add tests for bug #33660
ac05595889 Memory file system returns Uint8List from readAsBytes
d26dba1619 More positions in dart2 constant evaluator
eafc52aae7 Add a recovery test
8be1ddbd75 Throw FileSystemException from _FileSystemEntityAdaptor when the file does not exist.
98391f2737 [vm] Refactoring: move StreamingScopeBuilder out of kernel_binary_flowgraph
6dfc4ef663 Remove old dart2analyzer not strong status file entries.
32d208d8b0 Revert "Adjust status lines for safari"
5da24bbec2 Adjust status lines for safari
c1f6c9d8c5 Fix dart2js-hostassert configuration and enable it on the CQ
1717371c99 Move InferredData to GlobalTypeInferenceResults
403e7c8022 Use DataComputer class to implement equivalence based tests
5dbf6da529 Remove generics where only ir.Node is used
da9705b356 Split compileLoadedLibraries
04168fa922 Move more methods to ClassHierarchy.
a4c47afcae Fix global-inference bug.
3e33c3d0fc Eliminate analysis warnings in pkg/ code.
72f3abc239 Fix force-strong flag.
e3323ae918 [vm/inliner] Inline typed data on 32-bit archs.
f5a3af4fcd [VM] A const bool.fromEnvironment() with an explicit defaultValue of `null` should default to `null`
1a08800dd6 Run analyzer --use-fasta-parser on the language2 tests; update status file.
aa6dc1e2d5 [fasta] Resolve redirecting factories invocations after bodies are built
31cd00b12c Mark the analysis server integration tests as slow.
65ee9519d1 Force tests to fail pending implementation.
d52555c26e Update the changelog for analyzer changes.
d6cf9b471e Deprecate and remove the implementation of an older flag.
609a191115 Basic implementation of MOVE_FILE for files
149c5a0e0e Improve formatting of errors in golden files
a600171def Update expectations after parser updates
7570fb86f2 [fasta] Set parent of annotations in BodyBuilder.finishMetadata.
e8ff3d596f Deprecate and ignore the --strong flag on dartanalyzer.
a5b8ed1299 Have dart2analyzer no longer use the --no-preview-dart-2 flag in test.py.
58e74023c7 Initial attempt to analyze stack traces
a07b2a10c6 Changed all warnings to errors in the language specification.
5b5e36f0be Remove use of deprecated methods and constants.
1400cf66e7 Add named configurations to test matrix.
5d2405f112 Update the status file for slow tests.
9871ad23c9 [infra] Move fasta legacy mode SDK tests to their own builder
bb69cc15cb Add ClassHierarchy to share code between J/KClosedWorld (second attempt)
148013f9f7 Re-add tests for MOVE_FILE refactoring.
9873f04efc Update service test to not be different in sync async mode
dbd97fb8a5 Prep for analyzer 0.32.3, front_end 0.1.3, kernel 0.3.3
6e8332bf77 Remove older analyzer bots.
eeb54497cf More slow test status file updates
c339846594 [kernel] Move util.dart from bin to lib.
11123b774a Adjust status lines for firefox
620ab34de6 [vm] Implement reading of parameter annotations from kernel
7d7e39a952 [build] Move dart2js run for Observatory from python to GN
3c5fe3c7e4 Prevent npe when constructor cannot be resolved
d50fa68176 Update strong status in host-checked mode
6218c0fbb3 Mark analyzer tests as slow.
f39eaf937c [vm] Refactoring: remove dependency of StreamingScopeBuilder on StreamingFlowGraphBuilder
d5ccb53f01 Remove more uses of isInstanceOf
7007137dd0 Adjustments to dart2js test matrix.
45eee81252 Check another case of StaticWarningCode.TYPE_PARAMETER_REFERENCED_BY_STATIC.
4c789e9c09 Support the instantiation of abstract constructors
d3b4ba3a0b Revert "Fix #32227 export dynamic from dart:core in analyzer."
aa93fa1653 Update documentation of --host-checked.
afaca9f7cf Use field for class hierarchy map
46bfa7297e Have the regular analyzer bots test in dart 2 mode.
90e9fec5ae Add changelog entry for language change on int literals
8c63d578a6 [vm] Refactoring: move out classes independent of StreamingFlowGraphBuilder
aa009339b3 Update test matrix for dart2js
53525542cd Add tests for instance create of an abstract generic class
33f58d5b69 Add dump-info end to end test
98a2e90d4f [vm] Combine internal and external allocation into one allocation limit.
287615986c Resolve arguments and type arguments for unresolved invocations.
c99268feb9 Replace handleUnrecoverableError with handleRecoverableError
0ccdc3ec38 Reland: [dart:io] Adds Socket.startConnect
c9fd95119d Add file path to ResolutionApplier error message
fb762be46a Update dart_style to version 1.1.1 in DEPS
db7085a292 Rename UnresolvedTargetInvocation.
b803d74c9b Adjusted errors for FutureOr in class headers
c407e83d0e Delete duplicate key "configurations" in test_matrix.json
b303f5ad86 Add flag --named-configuration (-n) to test.py options.
22b9847cca [analyzer][cfe] Don't crash on converting errors with Severity.context
4fd04044fb Adjusted circularity prevention rule for type variable subtyping
1467909921 Call _completeOnAsyncReturn instead of .complete directly
b7b24e9bbe Update dart2js-strong status across several suites
11e001595a Update analysis options files.
ed6c09636f Remove old entries from pkg/pkg.status.
30807fe164 [VM interpreter] Fix InterpretCall stub. The stub was marking the thread as executing VM code too early, since the slow path of AllocateArray (called via PushArrayOfArguments) calls into the runtime. With this fix, DeltaBlueClosures can run in fully interpreted mode.
10c13e0e9e - deprecate strong-mode: options - move those settings to the language: options settings - ignore strong-mode: false in the analysis options file
3a22666ba7 Clearing a LinkedHashMap should not do big allocations
adb4b4af2c Remove another call to handleUnrecoverableError
fd26d67a0b Added getLegacyStats until Chrome fully supports new getStats() API.
```

* Update license hash

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