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

Source/core/html/canvas/WebGLContextObject.cpp

Index: Source/core/html/canvas/WebGLContextObject.cpp
diff --git a/Source/core/html/canvas/WebGLContextObject.cpp b/Source/core/html/canvas/WebGLContextObject.cpp
index 83441589defb70bea4690902c64c94840d3ce119..ee8a7401cb44732b770c33cd6a00a997b9f360da 100644
--- a/Source/core/html/canvas/WebGLContextObject.cpp
+++ b/Source/core/html/canvas/WebGLContextObject.cpp
@@ -39,8 +39,10 @@ WebGLContextObject::WebGLContextObject(WebGLRenderingContextBase* context)
 
 WebGLContextObject::~WebGLContextObject()
 {
+#if !ENABLE(OILPAN)
     if (m_context)
         m_context->removeContextObject(this);

[haraken, 2014/07/03 04:40:29]

Not related to this CL, I wonder why this destructor doesn't call
deleteObject(m_context->webContext()).

[sof, 2014/07/03 07:25:48]

Looks like its derived classes does it instead.

+#endif
 }
 
 void WebGLContextObject::detachContext()
@@ -49,7 +51,7 @@ void WebGLContextObject::detachContext()
     if (m_context) {
         deleteObject(m_context->webContext());
         m_context->removeContextObject(this);
-        m_context = 0;
+        m_context = nullptr;
     }
 }
 
@@ -58,4 +60,10 @@ blink::WebGraphicsContext3D* WebGLContextObject::getAWebGraphicsContext3D() cons
     return m_context ? m_context->webContext() : 0;
 }
 
+void WebGLContextObject::trace(Visitor* visitor)
+{
+    visitor->trace(m_context);
+    WebGLObject::trace(visitor);
+}
+
 }