Add a faster path for QuickDraw plugin drawing for limited use.

The current approcah for QuickDraw plugins--letting them draw into an actual window and then scraping the contents out--is more correct than our original approach, which was to give plugins a port pointing to a pixel buffer instead of the window. Unfortunately, it's also substantially slower to scrape a window than to copy pixel buffers.

Most of the time, the old way is good enough for QuickTime, and gives us substantially better framerates. This change makes QuickTime use a hybrid approach, using the fast path when possible, and the slow path when necessary. The primary situations when we need the slow path are:
- During event handling
- When we need the controls re-painted

The are a couple of edge-case event handling regressions, and the time slider seems to move more jerkily, but the improvent in framerate makes it a worthwhile tradeoff (e.g., a large trailer goes from ~25 fps to the full 50).

BUG=37968
TEST=Play QuickTime movies; playback should be smoother, and there should be no serious regressions over previous versions.

Review URL: http://codereview.chromium.org/1333005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42794 0039d316-1c4b-4281-b951-d872f2087c98

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