Add CDM FileIO tests.

media/cdm/ppapi/clear_key_cdm.h

Index: media/cdm/ppapi/clear_key_cdm.h
diff --git a/media/cdm/ppapi/clear_key_cdm.h b/media/cdm/ppapi/clear_key_cdm.h
index 4c5cb3465ac94a0aebf5a8f42dadef8be5f22c3f..f578a26747e4cfc6dd6479375895d719650f6e7a 100644
--- a/media/cdm/ppapi/clear_key_cdm.h
+++ b/media/cdm/ppapi/clear_key_cdm.h
@@ -23,6 +23,7 @@
 #endif
 
 namespace media {
+class CdmFileIOTest;
 class CdmVideoDecoder;
 class DecoderBuffer;
 class FFmpegCdmAudioDecoder;
@@ -143,6 +144,11 @@ class ClearKeyCdm : public ClearKeyCdmInterface {
                                       cdm::AudioFrames* audio_frames);
 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 
+  void StartCdmFileIOTest();
+
+  // Callback for CDM File IO test.
+  void OnFileIOTestComplete(bool success);
+
   Client client_;
   AesDecryptor decryptor_;
 
@@ -154,7 +160,8 @@ class ClearKeyCdm : public ClearKeyCdmInterface {
 
   const bool is_decrypt_only_;
 
-  std::string heartbeat_session_id_;
+  std::string last_session_id_;
+
   std::string next_heartbeat_message_;
 
   // Timer delay in milliseconds for the next host_->SetTimer() call.
@@ -178,6 +185,8 @@ class ClearKeyCdm : public ClearKeyCdmInterface {
 
   scoped_ptr<CdmVideoDecoder> video_decoder_;
 
+  scoped_ptr<CdmFileIOTest> cdm_file_io_test_;
+
   DISALLOW_COPY_AND_ASSIGN(ClearKeyCdm);
 };