Pepper: Add MonitorIsExternal function to PPB_Flash_DRM.

ppapi/proxy/flash_drm_resource.h

Index: ppapi/proxy/flash_drm_resource.h
diff --git a/ppapi/proxy/flash_drm_resource.h b/ppapi/proxy/flash_drm_resource.h
index 9a4b31c941d4e8eeec4b27fa855be2dcd3fb7b05..dd2b599c1c21d0f1617ac76bac520c69b7f32028 100644
--- a/ppapi/proxy/flash_drm_resource.h
+++ b/ppapi/proxy/flash_drm_resource.h
@@ -35,6 +35,9 @@ class FlashDRMResource
   virtual int32_t GetVoucherFile(
       PP_Resource* file_ref,
       scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t MonitorIsExternal(
+      PP_Bool* is_external,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
 
  private:
   void OnPluginMsgGetDeviceIDReply(PP_Var* dest,
@@ -45,6 +48,11 @@ class FlashDRMResource
                                       scoped_refptr<TrackedCallback> callback,
                                       const ResourceMessageReplyParams& params,
                                       const FileRefCreateInfo& file_info);
+  void OnPluginMsgMonitorIsExternalReply(
+      PP_Bool* dest,
+      scoped_refptr<TrackedCallback> callback,
+      const ResourceMessageReplyParams& params,
+      PP_Bool is_external);
 
   DISALLOW_COPY_AND_ASSIGN(FlashDRMResource);
 };