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 9c8ae0a5ee04b061f7805947d99418f73bdb2bf7..b0443a0b8bb1504117f65eaf30442bf303054190 100644
--- a/content/renderer/media/cdm_session_adapter.h
+++ b/content/renderer/media/cdm_session_adapter.h
@@ -65,6 +65,12 @@ class CdmSessionAdapter : public base::RefCounted<CdmSessionAdapter> {
   // after WebContentDecryptionModule is freed. http://crbug.com/330324
   media::Decryptor* GetDecryptor();
 
+#if defined(OS_ANDROID)
+  // Returns the CDM ID associated with the |media_keys_|. May be kInvalidCdmId
+  // if no CDM ID is associated.
+  int GetCdmId() const;
+#endif
+
  private:
   friend class base::RefCounted<CdmSessionAdapter>;
   typedef std::map<uint32, WebContentDecryptionModuleSessionImpl*> SessionMap;
@@ -85,12 +91,16 @@ class CdmSessionAdapter : public base::RefCounted<CdmSessionAdapter> {
   // Helper function of the callbacks.
   WebContentDecryptionModuleSessionImpl* GetSession(uint32 session_id);
 
+  // Session ID should be unique per renderer process for debugging purposes.
+  static uint32 next_session_id_;
+
   scoped_ptr<media::MediaKeys> media_keys_;
 
   SessionMap sessions_;
 
-  // Session ID should be unique per renderer process for debugging purposes.
-  static uint32 next_session_id_;
+#if defined(OS_ANDROID)
+  int cdm_id_;
+#endif
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<CdmSessionAdapter> weak_ptr_factory_;