Reviewed by Kenneth Russell.

        [chromium] Make throttling of WebGL based on webgl frames, not compositor frames
        https://bugs.webkit.org/show_bug.cgi?id=60508

        When a WebGL layer is dirtied outside of a requestAnimFrame callback, we need
        to prevent WebGL from running too far ahead of the GPU process. The current
        throttling mechanism relies on prepareTexture being called for every WebGL frame.
        However, in a non-requestAnimFrame application, multiple frames might get created
        before the compositor runs and calls prepareTexture on the surface.

        To address this, we post a task that calls a special rate limiting GL extension on
        the WebGL context after every WebGL "frame." When the compositor runs, it calls
        prepareTexture as usual.

        * platform/graphics/chromium/Extensions3DChromium.h:
        * platform/graphics/chromium/LayerRendererChromium.cpp:
        (WebCore::LayerRendererChromium::LayerRendererChromium):
        * platform/graphics/chromium/LayerRendererChromium.h:
        (WebCore::LayerRendererChromium::setIsAnimating):
        (WebCore::LayerRendererChromium::isAnimating):
        * platform/graphics/chromium/WebGLLayerChromium.cpp:
        (WebCore::WebGLLayerChromiumRateLimitTask::WebGLLayerChromiumRateLimitTask):
        (WebCore::WebGLLayerChromiumRateLimitTask::run):
        (WebCore::WebGLLayerChromiumRateLimitTask::cancel):
        (WebCore::WebGLLayerChromium::WebGLLayerChromium):
        (WebCore::WebGLLayerChromium::~WebGLLayerChromium):
        (WebCore::WebGLLayerChromium::setTextureUpdated):
        (WebCore::WebGLLayerChromium::setContext):
        * platform/graphics/chromium/WebGLLayerChromium.h:
        (WebCore::WebGLLayerChromium::context):
2011-05-11  Nat Duca  <nduca@chromium.org>

        Reviewed by Kenneth Russell.

        [chromium] Make throttling of WebGL based on webgl frames, not compositor frames
        https://bugs.webkit.org/show_bug.cgi?id=60508

        Tell LayerRendererChromium when the requestAnimFrame-callbacks are running.

        * public/WebGraphicsContext3D.h:
        (WebKit::WebGraphicsContext3D::rateLimitOffscreenContextCHROMIUM):
        * src/Extensions3DChromium.cpp:
        (WebCore::Extensions3DChromium::rateLimitOffscreenContextCHROMIUM):
        * src/GraphicsContext3DChromium.cpp:
        * src/GraphicsContext3DInternal.h:
        * src/WebViewImpl.cpp:
        (WebKit::WebViewImpl::animate):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86278 268f45cc-cd09-0410-ab3c-d52691b4dbfc