Hook up ui::Compositor to Display's BeginFrameSource

components/mus/surfaces/direct_output_surface_ozone.cc

 // Copyright 2016 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/direct_output_surface_ozone.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/output_surface_client.h"
 #include "components/mus/gles2/mojo_gpu_memory_buffer_manager.h"
 #include "components/mus/surfaces/buffer_queue.h"
 #include "components/mus/surfaces/surfaces_context_provider.h"
 #include "gpu/command_buffer/client/context_support.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace mus {
 
 DirectOutputSurfaceOzone::DirectOutputSurfaceOzone(
     const scoped_refptr<SurfacesContextProvider>& context_provider,
     gfx::AcceleratedWidget widget,
+    base::SingleThreadTaskRunner* task_runner,
     uint32_t target,
     uint32_t internalformat)
     : cc::OutputSurface(context_provider),
       output_surface_(
           new BufferQueue(context_provider, target, internalformat, widget)),
+      synthetic_begin_frame_source_(new cc::SyntheticBeginFrameSource(
+          task_runner,
+          cc::BeginFrameArgs::DefaultInterval())),
       weak_ptr_factory_(this) {
   capabilities_.uses_default_gl_framebuffer = false;
   capabilities_.flipped_output_surface = true;
   // Set |max_frames_pending| to 2 for surfaceless, which aligns scheduling
   // more closely with the previous surfaced behavior.
   // With a surface, swap buffer ack used to return early, before actually
   // presenting the back buffer, enabling the browser compositor to run ahead.
   // Surfaceless implementation acks at the time of actual buffer swap, which
   // shifts the start of the new frame forward relative to the old
   // implementation.
@@ skipping 42 matching lines @@
   gpu::SyncToken sync_token;
   gl->GenUnverifiedSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
 
   client_->DidSwapBuffers();
 }
 
 bool DirectOutputSurfaceOzone::BindToClient(cc::OutputSurfaceClient* client) {
   if (!cc::OutputSurface::BindToClient(client))
     return false;
 
+  client->SetBeginFrameSource(synthetic_begin_frame_source_.get());
+
   if (capabilities_.uses_default_gl_framebuffer) {
     capabilities_.flipped_output_surface =
         context_provider()->ContextCapabilities().gpu.flips_vertically;
   }
   return true;
 }
 
-// TODO(rjkroege): Plumb vsync properties.
 void DirectOutputSurfaceOzone::OnUpdateVSyncParametersFromGpu(
     base::TimeTicks timebase,
     base::TimeDelta interval) {
   DCHECK(HasClient());
-  CommitVSyncParameters(timebase, interval);
-  // vsync_manager_->UpdateVSyncParameters(timebase, interval);
+  synthetic_begin_frame_source_->OnUpdateVSyncParameters(timebase, interval);
 }
 
 void DirectOutputSurfaceOzone::OnGpuSwapBuffersCompleted(
     gfx::SwapResult result) {
   DCHECK(output_surface_);
   bool force_swap = false;
   if (result == gfx::SwapResult::SWAP_NAK_RECREATE_BUFFERS) {
     // Even through the swap failed, this is a fixable error so we can pretend
     // it succeeded to the rest of the system.
     result = gfx::SwapResult::SWAP_ACK;
@@ skipping 20 matching lines @@
 // must create the native window in the size that the hardware reports.
 void DirectOutputSurfaceOzone::Reshape(const gfx::Size& size,
                                        float scale_factor,
                                        bool alpha) {
   OutputSurface::Reshape(size, scale_factor, alpha);
   DCHECK(output_surface_);
   output_surface_->Reshape(SurfaceSize(), scale_factor);
 }
 
 }  // namespace mus