Add DisplayScheduler to enable BeginFrame-based scheduling of surfaces.

cc/surfaces/onscreen_display_client.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 "cc/surfaces/onscreen_display_client.h"
 
 #include "base/trace_event/trace_event.h"
 #include "cc/output/output_surface.h"
+#include "cc/surfaces/display_scheduler.h"
 #include "cc/surfaces/surface_display_output_surface.h"
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_manager.h"
 
 namespace cc {
 
 OnscreenDisplayClient::OnscreenDisplayClient(
     scoped_ptr<OutputSurface> output_surface,
     SurfaceManager* manager,
     SharedBitmapManager* bitmap_manager,
     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
     const RendererSettings& settings,
     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : output_surface_(output_surface.Pass()),
       display_(new Display(this,
                            manager,
                            bitmap_manager,
                            gpu_memory_buffer_manager,
                            settings)),
       task_runner_(task_runner),
-      scheduled_draw_(false),
-      output_surface_lost_(false),
-      deferred_draw_(false),
-      pending_frames_(0),
-      weak_ptr_factory_(this) {
+      output_surface_lost_(false) {
 }
 
 OnscreenDisplayClient::~OnscreenDisplayClient() {
 }
 
 bool OnscreenDisplayClient::Initialize() {
-  return display_->Initialize(output_surface_.Pass());
+  scheduler_.reset(new DisplayScheduler(output_surface_.get(), display_.get(),
+                                        task_runner_));
+  return display_->Initialize(output_surface_.Pass(), scheduler_.get());
 }
 
 void OnscreenDisplayClient::CommitVSyncParameters(base::TimeTicks timebase,
                                                   base::TimeDelta interval) {
   surface_display_output_surface_->ReceivedVSyncParameters(timebase, interval);
 }
 
-void OnscreenDisplayClient::DisplayDamaged() {
-  if (scheduled_draw_ || deferred_draw_)
-    return;
-  TRACE_EVENT0("content", "OnscreenDisplayClient::DisplayDamaged");
-  if (pending_frames_ >= display_->GetMaxFramesPending()) {
-    deferred_draw_ = true;
-  } else {
-    ScheduleDraw();
-  }
-}
-
-void OnscreenDisplayClient::ScheduleDraw() {
-  DCHECK(!deferred_draw_);
-  DCHECK(!scheduled_draw_);
-  scheduled_draw_ = true;
-  task_runner_->PostTask(FROM_HERE, base::Bind(&OnscreenDisplayClient::Draw,
-                                               weak_ptr_factory_.GetWeakPtr()));
-}
-
 void OnscreenDisplayClient::OutputSurfaceLost() {
   output_surface_lost_ = true;
   surface_display_output_surface_->DidLoseOutputSurface();
 }
 
-void OnscreenDisplayClient::Draw() {
-  TRACE_EVENT0("content", "OnscreenDisplayClient::Draw");
-  if (output_surface_lost_)
-    return;
-  scheduled_draw_ = false;
-  display_->Draw();
-}
-
-void OnscreenDisplayClient::DidSwapBuffers() {
-  pending_frames_++;
-}
-
-void OnscreenDisplayClient::DidSwapBuffersComplete() {
-  pending_frames_--;
-  if ((pending_frames_ < display_->GetMaxFramesPending()) && deferred_draw_) {
-    deferred_draw_ = false;
-    ScheduleDraw();
-  }
-}
-
 void OnscreenDisplayClient::SetMemoryPolicy(const ManagedMemoryPolicy& policy) {
   surface_display_output_surface_->SetMemoryPolicy(policy);
 }
 
 }  // namespace cc