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

Source/core/html/canvas/WebGLSharedWebGraphicsContext3D.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/html/canvas/WebGLSharedWebGraphicsContext3D.h"
+
+#if ENABLE(OILPAN)
+#include "platform/graphics/gpu/DrawingBuffer.h"
+#include "public/platform/WebGraphicsContext3D.h"
+
+namespace blink {
+
+PassRefPtr<WebGLSharedWebGraphicsContext3D> WebGLSharedWebGraphicsContext3D::create(PassRefPtr<DrawingBuffer> buffer)
+{
+    return adoptRef(new WebGLSharedWebGraphicsContext3D(buffer));
+}
+
+WebGLSharedWebGraphicsContext3D::WebGLSharedWebGraphicsContext3D(PassRefPtr<DrawingBuffer> buffer)
+    : m_buffer(buffer)
+{
+}
+
+WebGLSharedWebGraphicsContext3D::~WebGLSharedWebGraphicsContext3D()
+{
+    dispose();
+}
+
+void WebGLSharedWebGraphicsContext3D::dispose()
+{
+    if (m_buffer) {
+        m_buffer->beginDestruction();
+        m_buffer.clear();
+    }
+}
+
+void WebGLSharedWebGraphicsContext3D::update(PassRefPtr<DrawingBuffer> buffer)
+{
+    m_buffer = buffer;
+}
+
+DrawingBuffer* WebGLSharedWebGraphicsContext3D::drawingBuffer() const
+{
+    return m_buffer.get();
+}
+
+blink::WebGraphicsContext3D* WebGLSharedWebGraphicsContext3D::webContext() const
+{
+    return m_buffer ? m_buffer->context() : 0;
+}
+
+} // namespace blink
+
+#endif // ENABLE(OILPAN)