aura: use TestWebGraphicsContext3D for the shared contexts

ui/compositor/test_web_graphics_context_3d.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_COMPOSITOR_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 #define UI_COMPOSITOR_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGraphicsContext3D.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+#include "ui/compositor/compositor_export.h"
 
 namespace gfx {
 class GLContext;
 class GLSurface;
 }
 
 namespace ui {
 
 // WebGraphicsContext3D that does nothing. Suitable for testing.
-class TestWebGraphicsContext3D : public WebKit::WebGraphicsContext3D {
+class COMPOSITOR_EXPORT TestWebGraphicsContext3D :
+    public NON_EXPORTED_BASE(WebKit::WebGraphicsContext3D) {
  public:
   TestWebGraphicsContext3D();
   virtual ~TestWebGraphicsContext3D();
 
   void Initialize();
   virtual bool makeContextCurrent();
   virtual int width();
   virtual int height();
   virtual void reshape(int width, int height) {}
   virtual bool isGLES2Compliant();
@@ skipping 415 matching lines @@
   scoped_refptr<gfx::GLContext> gl_context_;
   scoped_refptr<gfx::GLSurface> gl_surface_;
   unsigned next_texture_id_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWebGraphicsContext3D);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_TEST_WEB_GRAPHICS_CONTEXT_3D_H_