[chromium] Background filters for composited layers

[chromium] Background filters for composited layers
https://bugs.webkit.org/show_bug.cgi?id=80046

Reviewed by Adrienne Walker.

Source/WebCore:

Adds background filters to LayerChromium/CCLayerImpl. These filters are
applied to any pixels in the contents behind the layer and seen through
it.

This is done by adding a backgroundTexture() to the render surface, which
holds the read-back contents of the target framebuffer, background filter
applied, in the surface's own coordinate space. Then this is drawn back
into the frame buffer before the contents of the surface itself is drawn.

Tests: platform/chromium/compositing/filters/background-filter-blur-off-axis.html
       platform/chromium/compositing/filters/background-filter-blur-outsets.html
       platform/chromium/compositing/filters/background-filter-blur.html

* platform/graphics/chromium/LayerChromium.cpp:
(WebCore::LayerChromium::setBackgroundFilters):
(WebCore):
(WebCore::LayerChromium::pushPropertiesTo):
* platform/graphics/chromium/LayerChromium.h:
(LayerChromium):
(WebCore::LayerChromium::backgroundFilters):
* platform/graphics/chromium/LayerRendererChromium.cpp:
(WebCore::LayerRendererChromium::drawBackgroundFilters):
(WebCore):
(WebCore::LayerRendererChromium::drawRenderSurfaceQuad):
(WebCore::LayerRendererChromium::getFramebufferTexture):
(WebCore::LayerRendererChromium::isCurrentRenderSurface):
(WebCore::LayerRendererChromium::useRenderSurface):
(WebCore::LayerRendererChromium::useManagedTexture):
(WebCore::LayerRendererChromium::bindFramebufferToTexture):
(WebCore::LayerRendererChromium::setScissorToRect):
* platform/graphics/chromium/LayerRendererChromium.h:
(LayerRendererChromium):
* platform/graphics/chromium/RenderSurfaceChromium.h:
(WebCore::RenderSurfaceChromium::setBackgroundFilters):
(WebCore::RenderSurfaceChromium::backgroundFilters):
(RenderSurfaceChromium):
* platform/graphics/chromium/cc/CCLayerImpl.cpp:
(WebCore::CCLayerImpl::setBackgroundFilters):
(WebCore):
* platform/graphics/chromium/cc/CCLayerImpl.h:
(CCLayerImpl):
(WebCore::CCLayerImpl::backgroundFilters):
* platform/graphics/chromium/cc/CCLayerTreeHostCommon.cpp:
(WebCore::subtreeShouldRenderToSeparateSurface):
(WebCore::calculateDrawTransformsAndVisibilityInternal):
* platform/graphics/chromium/cc/CCRenderSurface.cpp:
(WebCore::CCRenderSurface::drawableContentRect):
(WebCore::CCRenderSurface::prepareBackgroundTexture):
(WebCore):
(WebCore::CCRenderSurface::releaseBackgroundTexture):
(WebCore::CCRenderSurface::computeDeviceTransform):
(WebCore::CCRenderSurface::computeDeviceBoundingBox):
(WebCore::CCRenderSurface::computeReadbackDeviceBoundingBox):
(WebCore::CCRenderSurface::readbackDeviceContentRect):
(WebCore::copyTextureToFramebuffer):
(WebCore::CCRenderSurface::copyDeviceToBackgroundTexture):
(WebCore::getSkBitmapTextureId):
(WebCore::CCRenderSurface::drawContents):
(WebCore::CCRenderSurface::drawReplica):
(WebCore::CCRenderSurface::drawLayer):
(WebCore::CCRenderSurface::drawSurface):
(WebCore::CCRenderSurface::applyFilters):
* platform/graphics/chromium/cc/CCRenderSurface.h:
(CCRenderSurface):
(WebCore::CCRenderSurface::setBackgroundFilters):
(WebCore::CCRenderSurface::backgroundFilters):
(WebCore::CCRenderSurface::backgroundTexture):
* testing/Internals.cpp:
(WebCore):
(WebCore::Internals::setBackgroundBlurOnNode):
* testing/Internals.h:
(Internals):
* testing/Internals.idl:

Source/WebKit/chromium:

* tests/CCLayerImplTest.cpp:
(WebCore::TEST):

LayoutTests:

* platform/chromium/compositing/filters/background-filter-blur-expected.png: Added.
* platform/chromium/compositing/filters/background-filter-blur-expected.txt: Added.
* platform/chromium/compositing/filters/background-filter-blur-off-axis-expected.png: Added.
* platform/chromium/compositing/filters/background-filter-blur-off-axis-expected.txt: Added.
* platform/chromium/compositing/filters/background-filter-blur-off-axis.html: Added.
* platform/chromium/compositing/filters/background-filter-blur-outsets-expected.png: Added.
* platform/chromium/compositing/filters/background-filter-blur-outsets-expected.txt: Added.
* platform/chromium/compositing/filters/background-filter-blur-outsets.html: Added.
* platform/chromium/compositing/filters/background-filter-blur.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114081 268f45cc-cd09-0410-ab3c-d52691b4dbfc