For Android, fix hidden video element can't paint to canvas and WebGL issue.

Hidden video element (with style display:none) can't be paint to canvas or WebGL,
which blocks WebGL conformance test (textures/texture-npot-video.html):
  https://www.khronos.org/registry/webgl/sdk/tests/conformance/textures/texture-npot-video.html

BUG=138226,243295
TEST=Visit: https://www.khronos.org/registry/webgl/sdk/tests/conformance/textures/texture-npot-video.html

Review URL: https://chromiumcodereview.appspot.com/15875003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208456 0039d316-1c4b-4281-b951-d872f2087c98
11 files changed