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This rolls includes the following changes:

be6309690f (HEAD) Analyze pkg/dart2js_tools on the bots.
6f9073bb9d Wait for Analysis Server errors only while waiting for a response.
5d4e85ba3d Allow `x == null` to be a constant value whenever x is const.
7c77ed04f4 Move deobfuscation tools to the SDK repo
666c8c1a89 Fix @visibleForTemplate tests on Windows.
6fc1dd4480 analyzer_plugin no implicit-casts.
29401573d5 Get documentation comments before metadata as well.
3d0a663518 [vm/frontend-server] Fix frontend_server so that it can be tested.

* fix analyzer hint

* use --enable-asserts instead of --checked

* Roll Dart to version 1be785ae2ddb1754a184cd638ab719e94d86b4e9

This rolls includes the following changes :

1be785ae2d Clean up some dead code
7b9fb893d2 [vm] Add a service method for 'invoke' as the dual to 'eval'.
099f1504fa Mention -O flag in CHANGELOG
79f69abace [vm/compiler] breakage fix: add missing break
96a1e9985f Fix the pkg bot
7818db20a7 Add analysis hint for invalid use of @visibleForTemplate code.
71d96019d1 [vm/compiler] Introduce 64-bit NEGATE - all archs.
5013a2ccc4 Remove spurious line.
ef2f777625 Mark some analyzer tests as being flaky
cf560fe17b Fix a couple of the tests failing on the analyzer with fasta parser bot
63c11693e6 [gardening] Fix language_2/type_variable_promotion_test.
d0f28884ff [VM] Fix expression evaluation implementation: Never register temporary/unused classes with the system.
e2a1807fc2 [gardening] Update status for io/compile_all_test in PRODUCT AOT mode
f7ff739448 Insert date of 2.0.0 release in Changelog
bcabad6014 [vm] Fix SIMARM64 build on Windows.
af02ccae83 [infra] Fix filesets for new vm-kernel-precomp builders
8e2f28e264 Update homebrew to drop the @2 tab and fix for 2.0
ba119d7292 [VM] Remove "$compiler == precompiler" sections from language_2_precompiler.status
f3a2c0e28f [release] Prepare changelog for 2.1.0-dev.0.0
88cba7d860 [vm/kernel/bytecode] Fix arguments descriptor for List._fromLiteral call in bytecode
bd45ec0c4b [vm, gc] Refactor PageSpace::CollectGarbage to ensure the safepoint and task count remain well-scoped even with early exits.
8195fd8c64 Repair dart2js/string_interpolation_test
a0b335ac6c Try no implicit casts in pkg/analyzer_cli.
3d25d3761b Update pub - leave packages directories alone
327db5e9ab [vm] Fix kernel_isolate use_field_guard flag for kbc
a1ca88f554 Resolve invocation arguments to parameters.

* Address source format error.

Reverts flutter/engine#5961 as https://chromium-review.googlesource.com/c/chromium/tools/build/+/1164636 finally gets merged.

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It includes the following changes:
eab492385c Updates for passing / failing analysis_server tests.
235ccc9374 Remove --checked from dart --help
77d6758afb Attempt to fix failing tests on the windows bots
a2b052939e [vm] Add timeline events for GC phases.
9e9adcef57 [observatory] Include observatory main.dart.js.map with debug build.
7eda513405 [infra] Add new vm-kernel-precomp builders to the test matrix
83aa463fac Enable a few more server tests under CFE
75f92ac8fe Point old super mixin informal spec to canonical copy
5dd2aca7fe [kernel] Fix non-deterministic output generation
85d85246ad [vm/kernel/bytecode] Revise access to instance fields in bytecode
af45552aa5 [gen_snapshot] Remove --print_dependencies and --dependencies_only.
34f17b2973 [VM] Add missing 6-type-test to subtypecache search in simdbc (it has it in 2 places)
19a90c2c8b More CFE tests for server
6879e4cedc Add completion contributor tests for CFE
6137511849 Add more CFE tests for server
1cd9175e3e Fix mixed dartdoc processing
575a8f8381 [VM] Extend subtype-test mechanism with support for generic methods
278d962a7f [vm/precomp] Update status files for Dart 1 AOT.
35d26c9b14 Always use relative paths to import from within the front end
84d8887d3f Fixes a minor typo in the documentation of the StreamTransformer class.
1b6992b915 [dart2js] Mark failing unit tests as RuntimeError to fix CQ (#34095)
9b5a4241de [vm, gc] Don't rebuild the remembered set during marking.
c712470bb9 dart2js status bingo
dac348c8c9 [observatory] Only run field guards test if it is enabled in the vm.
4d156f9fb0 [dart2js] Fix function_type GVN bug
4196c0e2f5 Fix dart2js/sourcemaps/minified_names_test
8c059e7a34 Update language_2 status file for kernel bytecode passing tests.
ac69a3041a [vm, gc] Rename store_buffer.h as pointer_block.h as it also defines the mark stack blocks.
9510738c62 dart2js status update
6bdf3b7ed6 [observatory] Fix _guardLength serialization to output a string, rather than an int.
1f4449658d Refactor dartdoc parsing
0fbe9d3a95 [dart2js] Dynamically generated tear-off constructors should have names
cb4f5b3a3a Resynthesize nameOffset for properties/parameters.
69f216d4f1 Fix mock SDK and Flutter to pass some Flutter tests.
c619413fef Fix for unawaited future in assists.
66693ea6e2 [VM runtime] For now, do not use field guards when using kernel bytecode.
31765bf56f Clean up some hints in server code
c30af508a4 Store import prefix offset into metadata and resynthesize.
c439ebead0 [vm, gc] Update old allocation stats when scanning instead of pushing.
d933d4aa39 Update tests for const constructors in subclasses of mixin applications
b570ea1ff1 status update to make dart2js run function_type/ tests
9767af2550 [vm/precomp] Support @pragma for fields and remove associated entry-point entries.
80e08e0913 Use 'useCFE' flag to turn on CFE in AnalysisDriver.
98cf15cf5b Remove unnecessary commentToken parameter
89fd468b89 remove unused DocumentationCommentToken.references field
49b18446c2 Refactor dartdoc parsing
bc8a8386af Fix tests that reference the flutter package
de408202a5 [vm/precomp] Take 4 for procedure- and class-entrypoints.

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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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