Resolve to temporary texture when doing readpixels

Resolve to temporary texture when doing readpixels

We don't want to resolve to the parent texture, as that can cause an accidental swapbuffers when preserveDrawingBuffer is false. Instead create a temporary texture which will stick around for a while.

BUG=55927
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=95332

[Ken Russell (switch to Gerrit), 2011-08-02 22:14:43]

LGTM

It would be nice if we could avoid resolving the entire framebuffer for the case
where we only do something like a 1x1 ReadPixels call, though. Perhaps an
optional gfx::Size argument to the ScopedResolvedFrameBufferBinder constructor?

[commit-bot: I haz the power, 2011-08-03 21:54:29]

Change committed as 95332