Add decoder de-initialize and reset to the Pepper CDM API.

ppapi/thunk/ppb_instance_api.h

Index: ppapi/thunk/ppb_instance_api.h
diff --git a/ppapi/thunk/ppb_instance_api.h b/ppapi/thunk/ppb_instance_api.h
index b919e31960c9e0ef83f41b4e90b2aeca54cf04a4..49bf292a0dfae3e4d7533f8d6a4e422c6372c9be 100644
--- a/ppapi/thunk/ppb_instance_api.h
+++ b/ppapi/thunk/ppb_instance_api.h
@@ -157,6 +157,10 @@ class PPB_Instance_API {
   virtual void DeliverBlock(PP_Instance instance,
                             PP_Resource decrypted_block,
                             const PP_DecryptedBlockInfo* block_info) = 0;
+  virtual void DecoderReset(PP_Instance instance,
+                            uint32_t request_id) = 0;
+  virtual void DecoderStopped(PP_Instance instance,
+                              uint32_t request_id) = 0;
   virtual void DeliverFrame(PP_Instance instance,
                             PP_Resource decrypted_frame,
                             const PP_DecryptedFrameInfo* frame_info) = 0;