[dart2js/ddc/dart2wasm/dart:js_interop] Support SharedArrayBuffers in JS typed data wrappers

https://github.com/dart-lang/sdk/issues/56455

The existing native typed data implementation in dart2js/ddc
and the JS typed data wrappers in dart2wasm do not support
SharedArrayBuffers.

In dart2js/ddc, this is because the native type for ByteBuffer
is simply ArrayBuffer, leading to type failures when using
SharedArrayBuffers. To handle this, this change makes NativeByteBuffer
an abstract parent class to NativeArrayBuffer and NativeSharedArrayBuffer.
This allows ByteBuffer to support both types. There is a preexisting
SharedArrayBuffer type in dart:html that we should avoid breaking, so
we add an interface that NativeSharedArrayBuffer implements and expose
that interface.

In dart2wasm, JSArrayBufferImpl only allows ArrayBuffers as its
extern ref. This change makes that wrapper support SharedArrayBuffers
as well.

In dart:js_interop, the existing toJS conversion on ByteBuffer
now throws if the underlying buffer was actually a SharedArrayBuffer.
This is to support the return type of JSArrayBuffer. This behavior
technically already existed due to type differences in the JS
compilers, but was never possible with dart2wasm.

CoreLibraryReviewExempt: Backend-specific libraries with no real functional changes to public APIs.
Change-Id: I4dac9fb808590bf0c274da815c152cd4637316b1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/437526
Reviewed-by: Stephen Adams <sra@google.com>
Commit-Queue: Srujan Gaddam <srujzs@google.com>

https://dart.googlesource.com/sdk/+/67bda7c22b16254819345420cb293cc5ef58c4bf

DEPS

diff --git a/DEPS b/DEPS
index 0c5cbe9..7511531 100644
--- a/DEPS
+++ b/DEPS
@@ -229,7 +229,7 @@
 ]
 
 deps = {
-  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '482a7caed773bb8e6655808db4384ac90d76d89b',
+  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '67bda7c22b16254819345420cb293cc5ef58c4bf',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + 'a04fb324be734cf18811c30c06baf9bf07b3bab3',
 

commits.json

diff --git a/commits.json b/commits.json
index 2cf23a4..8fc0324 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
   "flutter":"a04fb324be734cf18811c30c06baf9bf07b3bab3",
-  "flutter/engine/src/flutter/third_party/dart":"482a7caed773bb8e6655808db4384ac90d76d89b"
+  "flutter/engine/src/flutter/third_party/dart":"67bda7c22b16254819345420cb293cc5ef58c4bf"
 }
\ No newline at end of file