Add CDM FileIO tests.

media/cdm/ppapi/cdm_adapter.cc

Index: media/cdm/ppapi/cdm_adapter.cc
diff --git a/media/cdm/ppapi/cdm_adapter.cc b/media/cdm/ppapi/cdm_adapter.cc
index 1da9d15ca1fd07f1b1cc6236a7e87f9ddd27c362..1ee5b0c2d96ccab43f09a5f49d0b546d332f2fd9 100644
--- a/media/cdm/ppapi/cdm_adapter.cc
+++ b/media/cdm/ppapi/cdm_adapter.cc
@@ -4,6 +4,7 @@
 
 #include "media/cdm/ppapi/cdm_adapter.h"
 
+#include "media/cdm/ppapi/cdm_file_io_impl.h"
 #include "media/cdm/ppapi/cdm_helpers.h"
 #include "media/cdm/ppapi/supported_cdm_versions.h"
 
@@ -868,6 +869,11 @@ void CdmAdapter::OnDeferredInitializationDone(cdm::StreamType stream_type,
   }
 }
 
+cdm::CdmFileIO* CdmAdapter::GetCdmFileIO(cdm::CdmFileIOClient* client) {
+  // The CDM owns this object and must call CdmFileIO::Close() to release it.

[ddorwin, 2013/12/04 05:27:08]

s/this/the returned/
And move to a function-level comment.

[xhwang, 2013/12/10 01:24:25]

Done.

+  return new CdmFileIOImpl(client, pp_instance());
+}
+
 #if defined(OS_CHROMEOS)
 void CdmAdapter::SendPlatformChallengeDone(int32_t result) {
   challenge_in_progress_ = false;