[NOT FOR REVIEW][PPAPI] Implement MediaStreamVideoTrack pepper API

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 65d7ee2b5cdf6653c422bcf542e4dded14a26e11..1bd1bda993ffe821c1f61ebc9791cd61f1b1ee99 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -1412,6 +1412,19 @@ IPC_MESSAGE_CONTROL1(PpapiHostMsg_IsolatedFileSystem_BrowserOpen,
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply,
                      std::string /* fsid */)
 
+// MediaStream -----------------------------------------------------------------
+// Message for init frames. It also takes a shared memory handle.
+IPC_MESSAGE_CONTROL1(PpapiPluginMsg_MediaStreamVideoTrack_CreateFromPendingHost,
+                     std::string /* id */)
+IPC_MESSAGE_CONTROL2(PpapiPluginMsg_MediaStreamTrack_InitFrames,
+                     int32_t /* number_of_frames */,
+                     int32_t /* frame_size */)
+IPC_MESSAGE_CONTROL1(PpapiPluginMsg_MediaStreamTrack_EnqueueFrame,
+                     int32_t /* index */);
+IPC_MESSAGE_CONTROL1(PpapiHostMsg_MediaStreamTrack_EnqueueFrame,
+                     int32_t /* index */);
+IPC_MESSAGE_CONTROL0(PpapiHostMsg_MediaStreamTrack_Close)
+
 // NetworkMonitor.
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_NetworkMonitor_Create)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_NetworkMonitor_NetworkList,
@@ -1648,7 +1661,6 @@ IPC_SYNC_MESSAGE_CONTROL2_2(PpapiHostMsg_SharedMemory_CreateSharedMemory,
                             ppapi::proxy::SerializedHandle /* plugin_handle */)
 
 // MediaStream -----------------------------------------------------------------
-
 // VideoDestination Private.
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_VideoDestination_Create)
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_VideoDestination_Open,