CdmAdapter: Report size of the file read by CDM via FileIO.

media/cdm/ppapi/cdm_file_io_impl.h

 // Copyright 2013 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 MEDIA_CDM_PPAPI_CDM_FILE_IO_IMPL_H_
 #define MEDIA_CDM_PPAPI_CDM_FILE_IO_IMPL_H_
 
 #include <algorithm>
 #include <string>
 #include <vector>
@@ skipping 17 matching lines @@
   // There should be only one instance of ResourceTracker in a process. Also,
   // ResourceTracker should outlive all CdmFileIOImpl instances.
   class ResourceTracker {
    public:
     ResourceTracker();
     ~ResourceTracker();
    private:
     DISALLOW_COPY_AND_ASSIGN(ResourceTracker);
   };
 
-  CdmFileIOImpl(cdm::FileIOClient* client, PP_Instance pp_instance);
+  // After the first successful file read, call |first_file_read_cb| to report
+  // the file size. |first_file_read_cb| takes one parameter: the file size in
+  // bytes.
+  CdmFileIOImpl(cdm::FileIOClient* client,
+                PP_Instance pp_instance,
+                const pp::CompletionCallback& first_file_read_cb);
 
   // cdm::FileIO implementation.
   virtual void Open(const char* file_name, uint32_t file_name_size) OVERRIDE;
   virtual void Read() OVERRIDE;
   virtual void Write(const uint8_t* data, uint32_t data_size) OVERRIDE;
   virtual void Close() OVERRIDE;
 
  private:
   enum State {
     FILE_UNOPENED,
@@ skipping 102 matching lines @@
   std::vector<char> io_buffer_;
 
   // Offset into the file for reading/writing data. When writing data to the
   // file, this is also the offset to the |io_buffer_|.
   size_t io_offset_;
 
   // Buffer to hold all read data requested. This buffer is passed to |client_|
   // when read completes.
   std::vector<char> cumulative_read_buffer_;
 
+  bool first_file_read_reported_;
+
+  // Callback to report the file size in bytes after the first successful read.
+  pp::CompletionCallback first_file_read_cb_;
+
   DISALLOW_COPY_AND_ASSIGN(CdmFileIOImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CDM_PPAPI_CDM_FILE_IO_IMPL_H_