Roll src/third_party/dart f96c483..0205858 (16 commits) (flutter#15744)

https://dart.googlesource.com/sdk.git/+log/f96c48307d14..020585872a25

git log f96c483..0205858 --date=short --first-parent --format='%ad %ae %s'
2020-01-17 [email protected] Intersect promoted types in joinV().
2020-01-17 [email protected] Fix await(ing) tests for List/MapLiteral inference.
2020-01-17 [email protected] Issue 40110. Update switchStatement_end() to 'isExhaustive', use for switch on enum in analyzer.
2020-01-17 [email protected] stop suggesting keywords in method type argument lists
2020-01-17 [email protected] type argument completions for generic method invocations
2020-01-17 [email protected] Remove unnecessary @OverRide
2020-01-17 [email protected] lambda generation for positional args
2020-01-17 [email protected] [dartdevc] Using a single cache for _typeObject and normalized types.
2020-01-17 [email protected] Migration: adapt instrumentation tests to test FixBuilder integration.
2020-01-17 [email protected] Migration: handle code changes within a non-dead branch of an if.
2020-01-17 [email protected] Migration: add support for converting `@required` to `required`.
2020-01-17 [email protected] Migration: further support for adding `?`s to types in FixBuilder.
2020-01-17 [email protected] Fix resolveNameInScope() for import scope.
2020-01-17 [email protected] NNBD preview: Fix html-escaping bug in region text
2020-01-17 [email protected] Re-read condition after resolution, it might be rewritten.
2020-01-17 [email protected] [observatory] Progress on making heap snapshot analysis a public library.

Created with:
  gclient setdep -r src/third_party/dart@020585872a25

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DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'f96c48307d14db2c16e7c3d4c01e9dee7fef4625',
+  'dart_revision': '020585872a25cc77add7f19e075b5b94cbf7eebf',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 44f46a78ddddd9fd8b69e83fb77505af
+Signature: 1b431972d9ced09c15d9af9f36e19fa9
 
 UNUSED LICENSES:
 
@@ -7757,6 +7757,7 @@ LIBRARY: dart
 ORIGIN: ../../../third_party/dart/benchmarks/ListCopy/dart/ListCopy.dart + ../../../third_party/dart/LICENSE
 TYPE: LicenseType.bsd
 FILE: ../../../third_party/dart/benchmarks/ListCopy/dart/ListCopy.dart
+FILE: ../../../third_party/dart/runtime/observatory/bin/heap_snapshot.dart
 FILE: ../../../third_party/dart/runtime/vm/field_table.cc
 FILE: ../../../third_party/dart/runtime/vm/field_table.h
 FILE: ../../../third_party/dart/runtime/vm/timeline_macos.cc
@@ -8403,7 +8404,6 @@ FILE: ../../../third_party/dart/runtime/lib/vmservice.cc
 FILE: ../../../third_party/dart/runtime/observatory/lib/allocation_profile.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/cli.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/debugger.dart
-FILE: ../../../third_party/dart/runtime/observatory/lib/heap_snapshot.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/sample_profile.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/allocation_profile/allocation_profile.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/app/analytics.dart
@@ -8929,7 +8929,6 @@ FILE: ../../../third_party/dart/runtime/observatory/lib/src/elements/retaining_p
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/elements/source_link.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/elements/strongly_reachable_instances.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/elements/vm_connect_target.dart
-FILE: ../../../third_party/dart/runtime/observatory/lib/src/heap_snapshot/heap_snapshot.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/exceptions.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/allocation_profile.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/breakpoint.dart
@@ -8944,7 +8943,6 @@ FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/flag.
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/frame.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/function.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/guarded.dart
-FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/heap_snapshot.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/heap_space.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/icdata.dart
 FILE: ../../../third_party/dart/runtime/observatory/lib/src/models/objects/inbound_references.dart