Implement SkImageFilter support in the compositor.

cc/layer_impl.cc

Index: cc/layer_impl.cc
diff --git a/cc/layer_impl.cc b/cc/layer_impl.cc
index d7f06e18fbdaaad8a2d21b5e820a3d39679e7fc3..cf8128abda3047a72132527f3819bb6b015606f3 100644
--- a/cc/layer_impl.cc
+++ b/cc/layer_impl.cc
@@ -15,6 +15,7 @@
 #include "cc/quad_sink.h"
 #include "cc/scrollbar_animation_controller.h"
 #include "cc/settings.h"
+#include "SkImageFilter.h"
 
 using WebKit::WebTransformationMatrix;
 
@@ -52,6 +53,7 @@ CCLayerImpl::CCLayerImpl(int id)
     , m_drawOpacityIsAnimating(false)
     , m_debugBorderColor(0)
     , m_debugBorderWidth(0)
+    , m_filter(0)
     , m_drawTransformIsAnimating(false)
     , m_screenSpaceTransformIsAnimating(false)
 #ifndef NDEBUG
@@ -69,6 +71,7 @@ CCLayerImpl::~CCLayerImpl()
 #ifndef NDEBUG
     DCHECK(!m_betweenWillDrawAndDidDraw);
 #endif
+    SkSafeUnref(m_filter);
 }
 
 void CCLayerImpl::addChild(scoped_ptr<CCLayerImpl> child)
@@ -489,6 +492,15 @@ void CCLayerImpl::setBackgroundFilters(const WebKit::WebFilterOperations& backgr
     m_layerPropertyChanged = true;
 }
 
+void CCLayerImpl::setFilter(SkImageFilter* filter)
+{
+    if (m_filter == filter)
+        return;
+
+    SkRefCnt_SafeAssign(m_filter, filter);
+    noteLayerPropertyChangedForSubtree();
+}
+
 void CCLayerImpl::setMasksToBounds(bool masksToBounds)
 {
     if (m_masksToBounds == masksToBounds)