[chromium] Allow retaining texture across frames in composited video playback and...

[chromium] Allow retaining texture across frames in composited video playback and correctly handle lost context
https://bugs.webkit.org/show_bug.cgi?id=77923

Reviewed by Kenneth Russell.

Thanks to r106840, we can improve the video playback mode a bit. Instead of creating a new texture on every
frame, this attempts to reuse the texture from the previous frame unless the context is lost. Also improves
error checking in case the TextureManager cannot successfully reserve memory for the texture.

Tested manually by killing the GPU process with an html5 video playing and verifying that the video playback
continues and that we don't create a new set of textures for each plane on each frame.

* platform/graphics/chromium/cc/CCVideoLayerImpl.cpp:
(WebCore::CCVideoLayerImpl::draw):
(WebCore::CCVideoLayerImpl::reserveTextures):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106992 268f45cc-cd09-0410-ab3c-d52691b4dbfc