Hook up ui::Compositor to Display's BeginFrameSource

components/mus/surfaces/surfaces_context_provider.cc

 // Copyright 2014 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 "components/mus/surfaces/surfaces_context_provider.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 10 matching lines @@
 namespace mus {
 
 namespace {
 const size_t kDefaultCommandBufferSize = 1024 * 1024;
 const size_t kDefaultStartTransferBufferSize = 1 * 1024 * 1024;
 const size_t kDefaultMinTransferBufferSize = 1 * 256 * 1024;
 const size_t kDefaultMaxTransferBufferSize = 16 * 1024 * 1024;
 }
 
 SurfacesContextProvider::SurfacesContextProvider(
-    SurfacesContextProviderDelegate* delegate,
     gfx::AcceleratedWidget widget,
     const scoped_refptr<GpuState>& state)
-    : delegate_(delegate), widget_(widget), command_buffer_local_(nullptr) {
+    : delegate_(nullptr), widget_(widget), command_buffer_local_(nullptr) {
   capabilities_.gpu.image = true;
   command_buffer_local_ = new CommandBufferLocal(this, widget_, state);
 }
 
+void SurfacesContextProvider::SetDelegate(
+    SurfacesContextProviderDelegate* delegate) {
+  DCHECK(!delegate_);
+  delegate_ = delegate;
+}
+
 // This is called when we have an accelerated widget.
 bool SurfacesContextProvider::BindToCurrentThread() {
   // SurfacesContextProvider should always live on the same thread as the
   // Window Manager.
   DCHECK(CalledOnValidThread());
   if (!command_buffer_local_->Initialize())
     return false;
   gles2_helper_.reset(
       new gpu::gles2::GLES2CmdHelper(command_buffer_local_));
   if (!gles2_helper_->Initialize(kDefaultCommandBufferSize))
@@ skipping 59 matching lines @@
                                                     int64_t interval) {
   if (delegate_)
     delegate_->OnVSyncParametersUpdated(timebase, interval);
 }
 
 void SurfacesContextProvider::DidLoseContext() {
   lost_context_callback_.Run();
 }
 
 }  // namespace mus