[Remoting Android] Fix GetWeakPtr() calls on multiple threads

[Remoting Android] Fix GetWeakPtr() calls on multiple threads

According to recent discovery of the thread safety issue of WeakPtrFactory,
WeakptrFactory::GetWeakPtr() can't be called on multiple threads. This CL
makes Android JNI classes that expose GetWeakPtr() function to store the
WeakPtr in constructor and simply return the stored WeakPtr in GetWeakPtr().

BUG=627602
Committed: https://crrev.com/bdbc56ba8839e6bb32a3677bf199234641f36806
Cr-Commit-Position: refs/heads/master@{#404948}

[Yuwei, 2016-07-12 22:05:38]

yuweih@chromium.org changed reviewers:
+ lambroslambrou@chromium.org, sergeyu@chromium.org

[Yuwei, 2016-07-12 22:05:39]

ptal

[Lambros, 2016-07-12 22:24:18]

lgtm

[Yuwei, 2016-07-13 00:49:59]

The CQ bit was checked by yuweih@chromium.org

[commit-bot: I haz the power, 2016-07-13 00:53:19]

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, 2016-07-13 03:18:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-13 03:19:35]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-13 03:21:25]

Description was changed from

==========
[Remoting Android] Fix GetWeakPtr() calls on multiple threads

According to recent discovery of the thread safety issue of WeakPtrFactory,
WeakptrFactory::GetWeakPtr() can't be called on multiple threads. This CL
makes Android JNI classes that expose GetWeakPtr() function to store the
WeakPtr in constructor and simply return the stored WeakPtr in GetWeakPtr().

BUG=627602
==========

to

==========
[Remoting Android] Fix GetWeakPtr() calls on multiple threads

According to recent discovery of the thread safety issue of WeakPtrFactory,
WeakptrFactory::GetWeakPtr() can't be called on multiple threads. This CL
makes Android JNI classes that expose GetWeakPtr() function to store the
WeakPtr in constructor and simply return the stored WeakPtr in GetWeakPtr().

BUG=627602

Committed: https://crrev.com/bdbc56ba8839e6bb32a3677bf199234641f36806
Cr-Commit-Position: refs/heads/master@{#404948}
==========

[commit-bot: I haz the power, 2016-07-13 03:21:26]

Patchset 1 (id:??) landed as
https://crrev.com/bdbc56ba8839e6bb32a3677bf199234641f36806
Cr-Commit-Position: refs/heads/master@{#404948}