Merge 91736 - Source/WebCore: Removed support for the GL_latch_CHROMIUM extension which Chromium ...

Merge 91736 - Source/WebCore: Removed support for the GL_latch_CHROMIUM extension which Chromium no longer supports.
Replaced calls to SetLatch with calls to Flush since Flush now has barrier semantics in Chromium.
https://bugs.webkit.org/show_bug.cgi?id=65043

BUG=80703
Patch by Al Patrick <apatrick@chromium.org>; on 2011-07-25
Reviewed by James Robinson.

* platform/graphics/chromium/Canvas2DLayerChromium.cpp:
(WebCore::Canvas2DLayerChromium::updateCompositorResources):
* platform/graphics/chromium/DrawingBufferChromium.cpp:
(WebCore::DrawingBuffer::publishToPlatformLayer):
* platform/graphics/chromium/Extensions3DChromium.h:
* platform/graphics/chromium/LayerRendererChromium.cpp:
(WebCore::LayerRendererChromium::LayerRendererChromium):
(WebCore::LayerRendererChromium::drawLayers):
(WebCore::LayerRendererChromium::addChildContext):
(WebCore::LayerRendererChromium::removeChildContext):
* platform/graphics/chromium/LayerRendererChromium.h:

Source/WebKit/chromium: Removed support for the GL_latch_CHROMIUM extension which Chromium no longer supports.
https://bugs.webkit.org/show_bug.cgi?id=65043

Patch by Al Patrick <apatrick@chromium.org>; on 2011-07-25
Reviewed by James Robinson.

* public/WebGraphicsContext3D.h:
* src/Extensions3DChromium.cpp:
* src/GraphicsContext3DChromium.cpp:
* src/GraphicsContext3DInternal.h:

TBR=commit-queue@webkit.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=93244