Expose SignalSyncPoint through MGL api

mojo/gles2/control_thunks_impl.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/gles2/control_thunks_impl.h"
 
 #include "mojo/gles2/gles2_context.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 
 namespace gles2 {
@@ skipping 41 matching lines @@
   current_context_tls_.Get()->interface()->SwapBuffers();
 }
 
 void* ControlThunksImpl::GetGLES2Interface(MojoGLES2Context context) {
   GLES2Context* client = reinterpret_cast<GLES2Context*>(context);
   DCHECK(client);
   return client->interface();
 }
 
 void ControlThunksImpl::SignalSyncPoint(
-    MojoGLES2Context context,
     uint32_t sync_point,
     MojoGLES2SignalSyncPointCallback callback,
     void* closure) {
   current_context_tls_.Get()->context_support()->SignalSyncPoint(
       sync_point, base::Bind(callback, closure));
 }
 
 gpu::gles2::GLES2Interface* ControlThunksImpl::CurrentGLES2Interface() {
   if (!current_context_tls_.Get())
     return nullptr;
   return current_context_tls_.Get()->interface();
 }
 
 ControlThunksImpl::ControlThunksImpl() {
 }
 
 ControlThunksImpl::~ControlThunksImpl() {
 }
 
 }  // namespace gles2