Encrypted Media: Implement IPC based SetCdm().

content/renderer/media/webcontentdecryptionmodule_impl.h

Index: content/renderer/media/webcontentdecryptionmodule_impl.h
diff --git a/content/renderer/media/webcontentdecryptionmodule_impl.h b/content/renderer/media/webcontentdecryptionmodule_impl.h
index d799664bf632065937207e780f4d0dbc55c74182..a8b0fc7edf4597eca11832397e89ba259096ac6d 100644
--- a/content/renderer/media/webcontentdecryptionmodule_impl.h
+++ b/content/renderer/media/webcontentdecryptionmodule_impl.h
@@ -47,6 +47,12 @@ class WebContentDecryptionModuleImpl
   // after WebContentDecryptionModule is freed. http://crbug.com/330324
   media::Decryptor* GetDecryptor();
 
+#if defined(OS_ANDROID)
+  // Returns the CDM ID associated with this object. May be kInvalidCdmId if no
+  // CDM ID is associated.
+  int GetCdmId() const;
+#endif  // defined(OS_ANDROID)
+
   // blink::WebContentDecryptionModule implementation.
   virtual blink::WebContentDecryptionModuleSession* createSession(
       blink::WebContentDecryptionModuleSession::Client* client);