Change transport dib API to not make copies of SharedMemoryHandle.

ppapi/thunk/ppb_image_data_api.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 PPAPI_THUNK_PPB_IMAGE_DATA_API_H_
 #define PPAPI_THUNK_PPB_IMAGE_DATA_API_H_
 
-#include "base/memory/shared_memory.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/ppb_image_data.h"
 
 class SkCanvas;
 
+namespace base {
+class SharedMemory;
+}  // namespace base
+
 namespace ppapi {
 namespace thunk {
 
 class PPB_ImageData_API {
  public:
   virtual ~PPB_ImageData_API() {}
 
   virtual PP_Bool Describe(PP_ImageDataDesc* desc) = 0;
   virtual void* Map() = 0;
   virtual void Unmap() = 0;
 
   // Trusted inteface.
-  virtual int32_t GetSharedMemory(base::SharedMemoryHandle* handle,
+  virtual int32_t GetSharedMemory(base::SharedMemory** shm,
                                   uint32_t* byte_count) = 0;
 
   // Get the platform-specific canvas that backs this ImageData, if there is
   // one.
   // The canvas will be NULL:
   //   * If the image is not mapped.
   //   * Within untrusted code (which does not have skia).
   //   * If the ImageData is not backed by a platform-specific image buffer.
   //     This will be the case for ImageDatas created for use in NaCl.
   // For this last reason, you should prefer GetCanvas any time you don't need
@@ skipping 13 matching lines @@
   // release its reference to the ImageData. If the current implementation
   // supports image data reuse (only supported out-of-process) then the
   // ImageData will be marked and potentially cached for re-use.
   virtual void SetIsCandidateForReuse() = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_PPB_IMAGE_DATA_API_H_