Regularize how ImageData and Graphics2D are created.

ppapi/proxy/ppb_image_data_proxy.h

 // Copyright (c) 2011 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 PPAPI_PPB_IMAGE_DATA_PROXY_H_
 #define PPAPI_PPB_IMAGE_DATA_PROXY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
@@ skipping 14 matching lines @@
 namespace skia {
 class PlatformCanvas;
 }
 
 namespace ppapi {
 
 class HostResource;
 
 namespace proxy {
 
+// The proxied image data resource. Unlike most resources, this needs to be
+// public in the header since a number of other resources need to access it.
 class ImageData : public ppapi::Resource,
                   public ppapi::thunk::PPB_ImageData_API,
                   public ppapi::ImageDataImpl {
  public:
   ImageData(const ppapi::HostResource& resource,
             const PP_ImageDataDesc& desc,
             ImageHandle handle);
   virtual ~ImageData();
 
   // Resource overrides.
@@ skipping 16 matching lines @@
   PP_ImageDataDesc desc_;
 
   scoped_ptr<TransportDIB> transport_dib_;
 
   // Null when the image isn't mapped.
   scoped_ptr<skia::PlatformCanvas> mapped_canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageData);
 };
 
+class PPB_ImageData_Proxy : public InterfaceProxy {
+ public:
+  PPB_ImageData_Proxy(Dispatcher* dispatcher);
+  virtual ~PPB_ImageData_Proxy();
+
+  static PP_Resource CreateProxyResource(PP_Instance instance,
+                                         PP_ImageDataFormat format,
+                                         const PP_Size& size,
+                                         PP_Bool init_to_zero);
+
+  // InterfaceProxy implementation.
+  virtual bool OnMessageReceived(const IPC::Message& msg);
+
+  static const ApiID kApiID = API_ID_PPB_IMAGE_DATA;
+
+ private:
+  // Message handler.
+  void OnHostMsgCreate(PP_Instance instance,
+                       int32_t format,
+                       const PP_Size& size,
+                       PP_Bool init_to_zero,
+                       HostResource* result,
+                       std::string* image_data_desc,
+                       ImageHandle* result_image_handle);
+
+  DISALLOW_COPY_AND_ASSIGN(PPB_ImageData_Proxy);
+};
+
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PPB_IMAGE_DATA_PROXY_H_