Take advantage of MojoGetBufferInformation

services/media/common/media_pipe_base.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 SERVICES_MEDIA_COMMON_MEDIA_PIPE_BASE_H_
 #define SERVICES_MEDIA_COMMON_MEDIA_PIPE_BASE_H_
 
 #include <atomic>
 #include <deque>
 #include <memory>
@@ skipping 49 matching lines @@
    public:
     static MappedSharedBufferPtr Create(ScopedSharedBufferHandle handle,
                                         uint64_t size);
     ~MappedSharedBuffer();
 
     const ScopedSharedBufferHandle& handle() const { return handle_; }
     uint64_t size() const { return size_; }
     void*    base() const { return base_; }
 
    private:
-    MappedSharedBuffer(ScopedSharedBufferHandle handle, size_t size);
+    MappedSharedBuffer(ScopedSharedBufferHandle handle, uint64_t size);
 
     ScopedSharedBufferHandle handle_;
-    size_t size_;
+    uint64_t size_;
     void*  base_ = nullptr;
   };
 
   // Interface to be implemented by derived classes
   virtual void OnPacketReceived(MediaPacketStatePtr state) = 0;
   virtual bool OnFlushRequested(const FlushCallback& cbk) = 0;
 
   MappedSharedBufferPtr buffer_;
 
  private:
   Binding<MediaConsumer> binding_;
 
   // MediaConsumer.mojom implementation.
   void SetBuffer(ScopedSharedBufferHandle handle,
-                uint64_t size,
                 const SetBufferCallback& cbk) final;
   void SendPacket(MediaPacketPtr packet,
                   const SendPacketCallback& cbk) final;
   void Prime(const PrimeCallback& cbk) final;
   void Flush(const FlushCallback& cbk) final;
 };
 
 }  // namespace media
 }  // namespace mojo
 
 #endif  // SERVICES_MEDIA_COMMON_MEDIA_PIPE_BASE_H_