[vm] Add a stub Dart_NotifyIdle() for the embedder to suggest a good time to do GC.

[vm] Add a stub Dart_NotifyIdle() for the embedder to suggest a good time to do GC.

Issue https://github.com/flutter/flutter/issues/9594

R=asiva@google.com

Committed: https://github.com/dart-lang/sdk/commit/6ef3f33403f0553bfbdf95bc3f27927faefff904

[rmacnak, 2017-08-05 00:03:52]

rmacnak@google.com changed reviewers:
+ abarth@google.com, asiva@google.com, chinmaygarde@google.com

[rmacnak, 2017-08-05 00:03:53]

I note that Magenta and V8 both switched from a duration-based API to a
deadline-based API, so following suite here.

[Chinmay, 2017-08-05 00:31:35]

On 2017/08/05 at 00:03:53, rmacnak wrote:
> I note that Magenta and V8 both switched from a duration-based API to a
deadline-based API, so following suite here.

Once this is rolled in, I will add a call that traces when the engine notified
the VM that it was idle as long as the deadline. Then we can verify how good of
a job the engine is doing in calculating the deadline.

[siva, 2017-08-07 16:53:04]

lgtm

[rmacnak, 2017-08-08 00:48:23]

Description was changed from

==========
[vm] Add a stub Dart_NotifyIdle() for the embedder to suggest a good time to do
GC.

Issue https://github.com/flutter/flutter/issues/9594
==========

to

==========
[vm] Add a stub Dart_NotifyIdle() for the embedder to suggest a good time to do
GC.

Issue https://github.com/flutter/flutter/issues/9594

R=asiva@google.com

Committed:
https://github.com/dart-lang/sdk/commit/6ef3f33403f0553bfbdf95bc3f27927faefff904
==========

[rmacnak, 2017-08-08 00:48:25]

Committed patchset #1 (id:1) manually as
6ef3f33403f0553bfbdf95bc3f27927faefff904 (presubmit successful).