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

Source/core/html/canvas/WebGLShaderPrecisionFormat.h

Index: Source/core/html/canvas/WebGLShaderPrecisionFormat.h
diff --git a/Source/core/html/canvas/WebGLShaderPrecisionFormat.h b/Source/core/html/canvas/WebGLShaderPrecisionFormat.h
index 5afd755fab772ebb82552842512517cb72811673..5a7c88959eecad0bb6acb6b40ee036dc7b5c50a4 100644
--- a/Source/core/html/canvas/WebGLShaderPrecisionFormat.h
+++ b/Source/core/html/canvas/WebGLShaderPrecisionFormat.h
@@ -29,19 +29,22 @@
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/graphics/GraphicsTypes3D.h"
+#include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
-class WebGLShaderPrecisionFormat : public RefCounted<WebGLShaderPrecisionFormat>, public ScriptWrappable {
+class WebGLShaderPrecisionFormat FINAL : public RefCountedWillBeGarbageCollected<WebGLShaderPrecisionFormat>, public ScriptWrappable {
 public:
-    static PassRefPtr<WebGLShaderPrecisionFormat> create(GLint rangeMin, GLint rangeMax, GLint precision);
+    static PassRefPtrWillBeRawPtr<WebGLShaderPrecisionFormat> create(GLint rangeMin, GLint rangeMax, GLint precision);
 
     GLint rangeMin() const;
     GLint rangeMax() const;
     GLint precision() const;
 
+    void trace(Visitor*) { }
+
 private:
     WebGLShaderPrecisionFormat(GLint rangeMin, GLint rangeMax, GLint precision);