Merge pull request #2741 from wuhengzhi/crosswalk-10

[Runtime] Add the check for return value of GetDEREncoded().
[Android] Fix the issue about status bar was not shown.

This patch is to fix the issue about status bar was not shown when exit
the fullscreen mode.
Add flag to avoid the second setting from video view.

BUG=XWALK-3023
(cherry picked from commit 9de6a7597178774a63453d55f009226f65365b82)