Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

components/html_viewer/web_graphics_context_3d_command_buffer_impl.h

 // Copyright 2015 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 COMPONENTS_HTML_VIEWER_WEB_GRAPHICS_CONTEXT_3D_COMMAND_BUFFER_IMPL_H_
 #define COMPONENTS_HTML_VIEWER_WEB_GRAPHICS_CONTEXT_3D_COMMAND_BUFFER_IMPL_H_
 
 #include "base/macros.h"
 #include "components/mus/public/interfaces/command_buffer.mojom.h"
 #include "gpu/blink/webgraphicscontext3d_impl.h"
 #include "mojo/public/c/gles2/gles2.h"
 #include "mojo/public/cpp/system/core.h"
 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "url/gurl.h"
 
 namespace mojo {
-class ApplicationImpl;
+class Shell;
 }
 
 namespace gpu {
   class ContextSupport;
   namespace gles2 { class GLES2Interface; }
 }
 
 namespace html_viewer {
 
 class GlobalState;
 
 class WebGraphicsContext3DCommandBufferImpl
     : public gpu_blink::WebGraphicsContext3DImpl {
  public:
   static WebGraphicsContext3DCommandBufferImpl* CreateOffscreenContext(
       GlobalState* global_state,
-      mojo::ApplicationImpl* app,
+      mojo::Shell* shell,
       const GURL& active_url,
       const blink::WebGraphicsContext3D::Attributes& attributes,
       blink::WebGraphicsContext3D* share_context,
       blink::WebGraphicsContext3D::WebGraphicsInfo* gl_info);
 
  private:
   WebGraphicsContext3DCommandBufferImpl(
       mojo::InterfacePtrInfo<mus::mojom::CommandBuffer> command_buffer_info,
       const GURL& active_url,
       const blink::WebGraphicsContext3D::Attributes& attributes,
       blink::WebGraphicsContext3D* share_context);
   ~WebGraphicsContext3DCommandBufferImpl() override;
 
   static void ContextLostThunk(void* closure) {
     static_cast<WebGraphicsContext3DCommandBufferImpl*>(closure)->ContextLost();
   }
   void ContextLost();
 
   MojoGLES2Context gles2_context_;
   scoped_ptr<gpu::gles2::GLES2Interface> context_gl_;
 
   DISALLOW_COPY_AND_ASSIGN(WebGraphicsContext3DCommandBufferImpl);
 };
 
 }  // namespace html_viewer
 
 #endif  // COMPONENTS_HTML_VIEWER_WEB_GRAPHICS_CONTEXT_3D_COMMAND_BUFFER_IMPL_H_