Implement OnPurgeMemory callback for RenderThreadImpl

Implement OnPurgeMemory callback for RenderThreadImpl

We added OnPurgeMemory() callback to MemoryCoordinatorClient so that we
can separate memory purging from memory state transition. This CL moves
purging logic from OnMemoryStateChange() to OnPurgeMemory() in
RenderThreadImpl.

BUG=684287
Review-Url: https://codereview.chromium.org/2688653002
Cr-Commit-Position: refs/heads/master@{#449236}
Committed: https://chromium.googlesource.com/chromium/src/+/233f65e7e1d46f4c497dd8384531bae054ed835f

[bashi, 2017-02-09 03:19:27]

The CQ bit was checked by bashi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-02-09 03:19:59]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[bashi, 2017-02-09 04:26:09]

bashi@chromium.org changed reviewers:
+ haraken@chromium.org, tasak@google.com

[bashi, 2017-02-09 04:26:09]

PTAL

[haraken, 2017-02-09 04:30:11]

LGTM

[kinuko, 2017-02-09 04:55:15]

lgtm for content/ (just saw this going by)

[commit-bot: I haz the power, 2017-02-09 06:14:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-02-09 06:14:23]

Dry run: This issue passed the CQ dry run.

[bashi, 2017-02-09 07:23:41]

On 2017/02/09 04:55:15, kinuko wrote:
> lgtm for content/ (just saw this going by)

Thanks! :)

[bashi, 2017-02-09 07:23:49]

The CQ bit was checked by bashi@chromium.org

[commit-bot: I haz the power, 2017-02-09 07:24:05]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-09 08:36:07]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486625029268670, "parent_rev":
"0c4ab45b18a9e054f9135d0c2cf74f7d1bb77a97", "commit_rev":
"233f65e7e1d46f4c497dd8384531bae054ed835f"}

[commit-bot: I haz the power, 2017-02-09 08:36:39]

Description was changed from

==========
Implement OnPurgeMemory callback for RenderThreadImpl

We added OnPurgeMemory() callback to MemoryCoordinatorClient so that we
can separate memory purging from memory state transition. This CL moves
purging logic from OnMemoryStateChange() to OnPurgeMemory() in
RenderThreadImpl.

BUG=684287
==========

to

==========
Implement OnPurgeMemory callback for RenderThreadImpl

We added OnPurgeMemory() callback to MemoryCoordinatorClient so that we
can separate memory purging from memory state transition. This CL moves
purging logic from OnMemoryStateChange() to OnPurgeMemory() in
RenderThreadImpl.

BUG=684287

Review-Url: https://codereview.chromium.org/2688653002
Cr-Commit-Position: refs/heads/master@{#449236}
Committed:
https://chromium.googlesource.com/chromium/src/+/233f65e7e1d46f4c497dd8384531...
==========

[commit-bot: I haz the power, 2017-02-09 08:36:40]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/233f65e7e1d46f4c497dd8384531...