Roll src/third_party/dart b4688e9172..7a7dcd1ed9 (5 commits)

dart-lang/sdk@7a7dcd1ed9 [vm/fuzzer] Several tweaks to reduce timeouts
dart-lang/sdk@27cd15585b Add BigInt/Int64 parse/toString benchmark
dart-lang/sdk@d2738bf9f0 [vm, gc] Reserve ForwardingPages up front.
dart-lang/sdk@1d5bdb2cee Revert "[vm, bytecode] Fix missing dependencies in --snapshot-deps output."
dart-lang/sdk@f2e32b5e65 [vm, bytecode] Fix missing dependencies in --snapshot-deps output.

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': 'b4688e917247bfc599325ca1ac389fc943c9b3fd',
+  'dart_revision': '7a7dcd1ed9ea01f5ce6734516fbb9d888a2cabff',
 
   # 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

-Signature: 07d9ca5e6de65cc92e31f805532a40a5
+Signature: 892c1b3c90bcb828a207255b570ee16f
 
 UNUSED LICENSES:
 
@@ -7429,8 +7429,12 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 ====================================================================================================
 LIBRARY: dart
-ORIGIN: ../../../third_party/dart/benchmarks/Calls/dart/Calls.dart + ../../../third_party/dart/LICENSE
+ORIGIN: ../../../third_party/dart/benchmarks/BigIntParsePrint/dart/BigIntParsePrint.dart + ../../../third_party/dart/LICENSE
 TYPE: LicenseType.bsd
+FILE: ../../../third_party/dart/benchmarks/BigIntParsePrint/dart/BigIntParsePrint.dart
+FILE: ../../../third_party/dart/benchmarks/BigIntParsePrint/dart/native_version.dart
+FILE: ../../../third_party/dart/benchmarks/BigIntParsePrint/dart/native_version_dummy.dart
+FILE: ../../../third_party/dart/benchmarks/BigIntParsePrint/dart/native_version_javascript.dart
 FILE: ../../../third_party/dart/benchmarks/Calls/dart/Calls.dart
 FILE: ../../../third_party/dart/benchmarks/Example/dart/Example.dart
 FILE: ../../../third_party/dart/benchmarks/FfiBoringssl/dart/FfiBoringssl.dart