Encrypted Media: Implement IPC based SetCdm().

content/renderer/media/cdm_session_adapter.h

Index: content/renderer/media/cdm_session_adapter.h
diff --git a/content/renderer/media/cdm_session_adapter.h b/content/renderer/media/cdm_session_adapter.h
index 611f25b5038cb12c99d83a1ddf4399e81fb9b429..d19ddcd60d95d1ae0d113b15ba984248b2846cb9 100644
--- a/content/renderer/media/cdm_session_adapter.h
+++ b/content/renderer/media/cdm_session_adapter.h
@@ -65,6 +65,10 @@ class CdmSessionAdapter : public base::RefCounted<CdmSessionAdapter> {
   // after WebContentDecryptionModule is freed. http://crbug.com/330324
   media::Decryptor* GetDecryptor();
 
+  // Returns the CDM ID associated with this object. May be kInvalidCdmId if no

[ddorwin, 2014/03/11 04:06:33]

Why does any of the Blink code (here and WCDM_impl) need this?

[ddorwin, 2014/03/11 18:05:14]

As discussed, this is only for being able to tell the IPC player what IPC CDM to
use.
Maybe we can pass this back up from Initialize() and make WCDMI store the value,
avoiding passing it

[xhwang, 2014/03/12 01:07:52]

Done.

+  // CDM ID is associated.
+  int GetCdmId();
+
  private:
   friend class base::RefCounted<CdmSessionAdapter>;
   typedef std::map<uint32, WebContentDecryptionModuleSessionImpl*> SessionMap;