Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/html/canvas/CanvasPattern.h

Index: Source/core/html/canvas/CanvasPattern.h
diff --git a/Source/core/html/canvas/CanvasPattern.h b/Source/core/html/canvas/CanvasPattern.h
index af2f502f19e36c82278d6d9435807fa01d4962d9..4bdc46f7a621f64f175364dd0b28e06af135454d 100644
--- a/Source/core/html/canvas/CanvasPattern.h
+++ b/Source/core/html/canvas/CanvasPattern.h
@@ -37,19 +37,21 @@ namespace blink {
 class ExceptionState;
 class Image;
 
-class CanvasPattern : public RefCounted<CanvasPattern>, public ScriptWrappable {
+class CanvasPattern FINAL : public RefCountedWillBeGarbageCollectedFinalized<CanvasPattern>, public ScriptWrappable {
 public:
     static void parseRepetitionType(const String&, bool& repeatX, bool& repeatY, ExceptionState&);
 
-    static PassRefPtr<CanvasPattern> create(PassRefPtr<Image> image, bool repeatX, bool repeatY, bool originClean)
+    static PassRefPtrWillBeRawPtr<CanvasPattern> create(PassRefPtr<Image> image, bool repeatX, bool repeatY, bool originClean)
     {
-        return adoptRef(new CanvasPattern(image, repeatX, repeatY, originClean));
+        return adoptRefWillBeNoop(new CanvasPattern(image, repeatX, repeatY, originClean));
     }
 
     Pattern* pattern() const { return m_pattern.get(); }
 
     bool originClean() const { return m_originClean; }
 
+    void trace(Visitor*) { }
+
 private:
     CanvasPattern(PassRefPtr<Image>, bool repeatX, bool repeatY, bool originClean);