Take advantage of MojoGetBufferInformation

mojo/services/media/common/cpp/mapped_shared_buffer.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 MOJO_SERVICES_MEDIA_COMMON_CPP_MAPPED_SHARED_BUFFER_H_
 #define MOJO_SERVICES_MEDIA_COMMON_CPP_MAPPED_SHARED_BUFFER_H_
 
 #include <memory>
 
 #include "mojo/public/cpp/system/buffer.h"
@@ skipping 13 matching lines @@
 class MappedSharedBuffer {
  public:
   MappedSharedBuffer();
 
   virtual ~MappedSharedBuffer();
 
   // Initializes by creating a new shared buffer of the indicated size.
   void InitNew(uint64_t size);
 
   // Initializes from a handle to an existing shared buffer.
-  void InitFromHandle(ScopedSharedBufferHandle handle, uint64_t size);
+  void InitFromHandle(ScopedSharedBufferHandle handle);
 
   // Indicates whether the buffer is initialized.
   bool initialized() const;
 
   // Gets the size of the buffer.
   uint64_t size() const;
 
   // Gets a duplicate handle for the shared buffer.
   ScopedSharedBufferHandle GetDuplicateHandle() const;
 
   // Translates an offset into a pointer.
   void* PtrFromOffset(uint64_t offset) const;
 
   // Translates a pointer into an offset.
   uint64_t OffsetFromPtr(void *payload_ptr) const;
 
  protected:
-  void InitInternal(ScopedSharedBufferHandle& handle, uint64_t size);
+  void InitInternal(const ScopedSharedBufferHandle& handle);
 
   // Does nothing. Called when initialization is complete. Subclasses may
   // override.
   virtual void OnInit();
 
  private:
   struct MappedBufferDeleter {
     inline void operator()(uint8_t* ptr) const {
       UnmapBuffer(ptr);
     }
   };
 
   // Size of the shared buffer.
   uint64_t size_;
 
   // Shared buffer when initialized with InitNew.
   std::unique_ptr<SharedBuffer> buffer_;
 
   // Handle to shared buffer when initialized with InitFromHandle.
   ScopedSharedBufferHandle handle_;
 
   // Pointer to the mapped buffer.
   std::unique_ptr<uint8_t, MappedBufferDeleter> buffer_ptr_;
 };
 
 }  // namespace media
 }  // namespace mojo
 
-#endif // MOJO_SERVICES_MEDIA_COMMON_CPP_MAPPED_SHARED_BUFFER_H_
+#endif  // MOJO_SERVICES_MEDIA_COMMON_CPP_MAPPED_SHARED_BUFFER_H_