Pepper: Expose visible_rect to PPB_VideoDecoder.GetPicture.

ppapi/proxy/ppapi_messages.h

Index: ppapi/proxy/ppapi_messages.h
diff --git a/ppapi/proxy/ppapi_messages.h b/ppapi/proxy/ppapi_messages.h
index de7caf37233266c3b621c2d9fd0b1c19fa19e06c..caf828729604c2ec8203f4eefef2f0f0c701c70f 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -1950,9 +1950,10 @@ IPC_MESSAGE_CONTROL4(PpapiPluginMsg_VideoDecoder_RequestTextures,
 IPC_MESSAGE_CONTROL2(PpapiHostMsg_VideoDecoder_AssignTextures,
                      PP_Size /* size */,
                      std::vector<uint32_t> /* texture_ids */)
-IPC_MESSAGE_CONTROL2(PpapiPluginMsg_VideoDecoder_PictureReady,
+IPC_MESSAGE_CONTROL3(PpapiPluginMsg_VideoDecoder_PictureReady,
                      int32_t /* decode_id */,
-                     uint32_t /* texture_id */)
+                     uint32_t /* texture_id */,
+                     PP_Rect /* visible_rect */)
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_VideoDecoder_RecyclePicture,
                      uint32_t /* texture_id */)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_VideoDecoder_DismissPicture,