Fix an issue that MediaController is disaled when entering fullscreen

Fix an issue that MediaController is disaled when entering fullscreen

In the old contentVideoView.java, we create the MediaController first in the openVideo() call.
Then we call updateMediaMetadata() to enable to media controller and set the metadata.
With ContentVideoViewLegacy.java, the ordering between updateMediaMetadata() and mediaController creation is reversed. That causes the controller to become disabled.
This change posts a task when RequestMediaMetadata() is called to solve the above issue, and to avoid the reentrance issue.

BUG=334635
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245376

[qinmin, 2014-01-16 21:39:36]

PTAL

[Ted C, 2014-01-16 21:45:08]

lgtm

https://codereview.chromium.org/141243002/diff/1/content/browser/android/cont...
File content/browser/android/content_video_view.h (right):

https://codereview.chromium.org/141243002/diff/1/content/browser/android/cont...
content/browser/android/content_video_view.h:112:
base::WeakPtrFactory<ContentVideoView> weak_this_;
weak_factory_ is much more common (~452 occurrences vs ~10)

[commit-bot: I haz the power, 2014-01-16 21:58:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/qinmin@chromium.org/141243002/60001

[commit-bot: I haz the power, 2014-01-16 23:41:57]

Change committed as 245376