Merge 106888 - WebGL must allocate smaller drawing buffer when the allocation fails.

Merge 106888 - WebGL must allocate smaller drawing buffer when the allocation fails.
https://bugs.webkit.org/show_bug.cgi?id=76654

Patch by Yongsheng Zhu <yongsheng.zhu@intel.com>; on 2012-02-06
Reviewed by Kenneth Russell.

Test: fast/canvas/webgl/drawingbuffer-test.html

* platform/graphics/gpu/DrawingBuffer.cpp:
(WebCore):
(WebCore::DrawingBuffer::create):
(WebCore::DrawingBuffer::reset):

TBR=commit-queue@webkit.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=107116