Make OffscreenCanvasRenderingContext2D renderable on a worker

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp

Index: third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
index ff96cb51b82b8ed1c31afd54261f3311c7d0e1ea..35990bd16f1fe9e2b825a317aa5f7e8181bae3f0 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
@@ -152,6 +152,12 @@ void CanvasRenderingContext2D::dispose()
     clearFilterReferences();
 }
 
+void CanvasRenderingContext2D::updateFilterReferences(const FilterOperations& filters)
+{
+    clearFilterReferences();
+    addFilterReferences(filters, canvas()->document());
+}
+
 void CanvasRenderingContext2D::validateStateStack()
 {
 #if ENABLE(ASSERT)
@@ -372,12 +378,12 @@ void CanvasRenderingContext2D::didDraw(const SkIRect& dirtyRect)
 
 bool CanvasRenderingContext2D::stateHasFilter()
 {
-    return state().hasFilter(canvas(), accessFont(), canvas()->size(), this);
+    return state().hasFilter(canvas(), &accessFont(), canvas()->size(), this);
 }
 
 SkImageFilter* CanvasRenderingContext2D::stateGetFilter()
 {
-    return state().getFilter(canvas(), accessFont(), canvas()->size(), this);
+    return state().getFilter(canvas(), &accessFont(), canvas()->size(), this);
 }
 
 SkCanvas* CanvasRenderingContext2D::drawingCanvas() const