Implement SkImageFilter support in the compositor.

cc/layer.cc

Index: cc/layer.cc
diff --git a/cc/layer.cc b/cc/layer.cc
index 2f53b092519857ff5d3249bae6161c871832348f..bf4cfd9c1f2e1cc3d79bab03587560d22e0850f4 100644
--- a/cc/layer.cc
+++ b/cc/layer.cc
@@ -12,6 +12,7 @@
 #include "CCLayerImpl.h"
 #include "CCLayerTreeHost.h"
 #include "CCSettings.h"
+#include "SkImageFilter.h"
 #include <public/WebAnimationDelegate.h>
 #include <public/WebLayerScrollClient.h>
 #include <public/WebSize.h>
@@ -44,6 +45,7 @@ LayerChromium::LayerChromium()
     , m_debugBorderColor(0)
     , m_debugBorderWidth(0)
     , m_opacity(1.0)
+    , m_filter(0)
     , m_anchorPointZ(0)
     , m_isContainerForFixedPositionLayers(false)
     , m_fixedToContainerLayer(false)
@@ -323,6 +325,16 @@ void LayerChromium::setFilters(const WebKit::WebFilterOperations& filters)
         CCLayerTreeHost::setNeedsFilterContext(true);
 }
 
+void LayerChromium::setFilter(SkImageFilter* filter)
+{
+    if (m_filter == filter)
+        return;
+    SkRefCnt_SafeAssign(m_filter, filter);
+    setNeedsCommit();
+    if (filter)
+        CCLayerTreeHost::setNeedsFilterContext(true);
+}
+
 void LayerChromium::setBackgroundFilters(const WebKit::WebFilterOperations& backgroundFilters)
 {
     if (m_backgroundFilters == backgroundFilters)
@@ -544,6 +556,7 @@ void LayerChromium::pushPropertiesTo(CCLayerImpl* layer)
     layer->setForceRenderSurface(m_forceRenderSurface);
     layer->setDrawsContent(drawsContent());
     layer->setFilters(filters());
+    layer->setFilter(filter());
     layer->setBackgroundFilters(backgroundFilters());
     layer->setUseLCDText(m_useLCDText);
     layer->setMasksToBounds(m_masksToBounds);