Added pref for snapshot document collapsed state

* Added boolean preference to persist other devices snapshot document
  collapsed/expanded state.
* Added JNI bridge to set/expand state.

NOTRY=true
BUG=294401

Review URL: https://codereview.chromium.org/33863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232874 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232874
Add UMA metrics for ffmpeg color ranges.

BUG=310272

Review URL: https://codereview.chromium.org/45053003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232875 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232875