Make SingleThreadProxy a SchedulerClient

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index d33477451a49e460cb820f49e24146d75694dbb0..1ba6d759e24440b2a69b9f9119a3a8c9e3a6a8a6 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -39,10 +39,6 @@ namespace {
 const double kDefaultRefreshRate = 60.0;
 const double kTestRefreshRate = 200.0;
 
-enum SwapType {
-  DRAW_SWAP,
-};
-
 bool g_compositor_initialized = false;
 base::Thread* g_compositor_thread = NULL;
 
@@ -50,24 +46,6 @@ ui::ContextFactory* g_context_factory = NULL;
 
 const int kCompositorLockTimeoutMs = 67;
 
-class PendingSwap {
- public:
-  PendingSwap(SwapType type, ui::PostedSwapQueue* posted_swaps);
-  ~PendingSwap();
-
-  SwapType type() const { return type_; }
-  bool posted() const { return posted_; }
-
- private:
-  friend class ui::PostedSwapQueue;
-
-  SwapType type_;
-  bool posted_;
-  ui::PostedSwapQueue* posted_swaps_;
-
-  DISALLOW_COPY_AND_ASSIGN(PendingSwap);
-};
-
 }  // namespace
 
 namespace ui {
@@ -115,92 +93,25 @@ void CompositorLock::CancelLock() {
   compositor_ = NULL;
 }
 
-class PostedSwapQueue {
- public:
-  PostedSwapQueue() : pending_swap_(NULL) {
-  }
-
-  ~PostedSwapQueue() {
-    DCHECK(!pending_swap_);
-  }
-
-  SwapType NextPostedSwap() const {
-    return queue_.front();
-  }
-
-  bool AreSwapsPosted() const {
-    return !queue_.empty();
-  }
-
-  int NumSwapsPosted(SwapType type) const {
-    int count = 0;
-    for (std::deque<SwapType>::const_iterator it = queue_.begin();
-         it != queue_.end(); ++it) {
-      if (*it == type)
-        count++;
-    }
-    return count;
-  }
-
-  void PostSwap() {
-    DCHECK(pending_swap_);
-    queue_.push_back(pending_swap_->type());
-    pending_swap_->posted_ = true;
-  }
-
-  void EndSwap() {
-    queue_.pop_front();
-  }
-
- private:
-  friend class ::PendingSwap;
-
-  PendingSwap* pending_swap_;
-  std::deque<SwapType> queue_;
-
-  DISALLOW_COPY_AND_ASSIGN(PostedSwapQueue);
-};
-
 }  // namespace ui
 
-namespace {
-
-PendingSwap::PendingSwap(SwapType type, ui::PostedSwapQueue* posted_swaps)
-    : type_(type), posted_(false), posted_swaps_(posted_swaps) {
-  // Only one pending swap in flight.
-  DCHECK_EQ(static_cast<PendingSwap*>(NULL), posted_swaps_->pending_swap_);
-  posted_swaps_->pending_swap_ = this;
-}
-
-PendingSwap::~PendingSwap() {
-  DCHECK_EQ(this, posted_swaps_->pending_swap_);
-  posted_swaps_->pending_swap_ = NULL;
-}
-
-}  // namespace
-
 namespace ui {
 
 Compositor::Compositor(gfx::AcceleratedWidget widget)
     : root_layer_(NULL),
       widget_(widget),
       vsync_manager_(new CompositorVSyncManager()),
-      posted_swaps_(new PostedSwapQueue()),
       device_scale_factor_(0.0f),
       last_started_frame_(0),
       last_ended_frame_(0),
-      next_draw_is_resize_(false),
       disable_schedule_composite_(false),
       compositor_lock_(NULL),
-      defer_draw_scheduling_(false),
-      waiting_on_compositing_end_(false),
-      draw_on_compositing_end_(false),
       schedule_draw_factory_(this) {
   DCHECK(g_compositor_initialized)
       << "Compositor::Initialize must be called before creating a Compositor.";
 
   root_web_layer_ = cc::Layer::Create();
-  root_web_layer_->SetAnchorPoint(gfx::PointF(0.f, 0.f));
+  root_web_layer_->SetAnchorPoint(gfx::PointF());
 
   CommandLine* command_line = CommandLine::ForCurrentProcess();
 
@@ -314,16 +225,7 @@ void Compositor::Terminate() {
   g_compositor_initialized = false;
 }
 
-void Compositor::ScheduleDraw() {
-  if (g_compositor_thread) {
-    host_->Composite(gfx::FrameTime::Now());
-  } else if (!defer_draw_scheduling_) {
-    defer_draw_scheduling_ = true;
-    base::MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&Compositor::Draw, schedule_draw_factory_.GetWeakPtr()));
-  }
-}
+void Compositor::ScheduleDraw() { host_->SetNeedsCommit(); }
 
 void Compositor::SetRootLayer(Layer* root_layer) {
   if (root_layer_ == root_layer)
@@ -343,45 +245,6 @@ void Compositor::SetHostHasTransparentBackground(
   host_->set_has_transparent_background(host_has_transparent_background);
 }
 
-void Compositor::Draw() {
-  DCHECK(!g_compositor_thread);
-
-  defer_draw_scheduling_ = false;
-  if (waiting_on_compositing_end_) {
-    draw_on_compositing_end_ = true;
-    return;
-  }
-  waiting_on_compositing_end_ = true;
-
-  TRACE_EVENT_ASYNC_BEGIN0("ui", "Compositor::Draw", last_started_frame_ + 1);
-
-  if (!root_layer_)
-    return;
-
-  last_started_frame_++;
-  PendingSwap pending_swap(DRAW_SWAP, posted_swaps_.get());
-  if (!IsLocked()) {
-    // TODO(nduca): Temporary while compositor calls
-    // compositeImmediately() directly.
-    Layout();
-    host_->Composite(gfx::FrameTime::Now());
-
-#if defined(OS_WIN)
-    // While we resize, we are usually a few frames behind. By blocking
-    // the UI thread here we minize the area that is mis-painted, specially
-    // in the non-client area. See RenderWidgetHostViewAura::SetBounds for
-    // more details and bug 177115.
-    if (next_draw_is_resize_ && (last_ended_frame_ > 1)) {
-      next_draw_is_resize_ = false;
-      host_->FinishAllRendering();
-    }
-#endif
-
-  }
-  if (!pending_swap.posted())
-    NotifyEnd();
-}
-
 void Compositor::ScheduleFullRedraw() {
   host_->SetNeedsRedraw();
 }
@@ -402,8 +265,6 @@ void Compositor::SetScaleAndSize(float scale, const gfx::Size& size_in_pixel) {
     size_ = size_in_pixel;
     host_->SetViewportSize(size_in_pixel);
     root_web_layer_->SetBounds(size_in_pixel);
-
-    next_draw_is_resize_ = true;
   }
   if (device_scale_factor_ != scale) {
     device_scale_factor_ = scale;
@@ -461,15 +322,10 @@ void Compositor::DidCommitAndDrawFrame() {
 }
 
 void Compositor::DidCompleteSwapBuffers() {
-  if (g_compositor_thread) {
-    NotifyEnd();
-  } else {
-    DCHECK(posted_swaps_->AreSwapsPosted());
-    DCHECK_GE(1, posted_swaps_->NumSwapsPosted(DRAW_SWAP));
-    if (posted_swaps_->NextPostedSwap() == DRAW_SWAP)
-      NotifyEnd();
-    posted_swaps_->EndSwap();
-  }
+  last_ended_frame_++;
+  TRACE_EVENT_ASYNC_END0("ui", "Compositor::Draw", last_ended_frame_);
+  FOR_EACH_OBSERVER(
+      CompositorObserver, observer_list_, OnCompositingEnded(this));
 }
 
 scoped_refptr<cc::ContextProvider> Compositor::OffscreenContextProvider() {
@@ -486,22 +342,9 @@ void Compositor::ScheduleAnimation() {
 }
 
 void Compositor::DidPostSwapBuffers() {
-  DCHECK(!g_compositor_thread);
-  posted_swaps_->PostSwap();
 }
 
 void Compositor::DidAbortSwapBuffers() {
-  if (!g_compositor_thread) {
-    DCHECK_GE(1, posted_swaps_->NumSwapsPosted(DRAW_SWAP));
-
-    // We've just lost the context, so unwind all posted_swaps.
-    while (posted_swaps_->AreSwapsPosted()) {
-      if (posted_swaps_->NextPostedSwap() == DRAW_SWAP)
-        NotifyEnd();
-      posted_swaps_->EndSwap();
-    }
-  }
-
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingAborted(this));
@@ -519,8 +362,7 @@ void Compositor::SetLayerTreeDebugState(
 scoped_refptr<CompositorLock> Compositor::GetCompositorLock() {
   if (!compositor_lock_) {
     compositor_lock_ = new CompositorLock(this);
-    if (g_compositor_thread)
-      host_->SetDeferCommits(true);
+    host_->SetDeferCommits(true);
     FOR_EACH_OBSERVER(CompositorObserver,
                       observer_list_,
                       OnCompositingLockStateChanged(this));
@@ -531,8 +373,7 @@ scoped_refptr<CompositorLock> Compositor::GetCompositorLock() {
 void Compositor::UnlockCompositor() {
   DCHECK(compositor_lock_);
   compositor_lock_ = NULL;
-  if (g_compositor_thread)
-    host_->SetDeferCommits(false);
+  host_->SetDeferCommits(false);
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingLockStateChanged(this));
@@ -543,21 +384,4 @@ void Compositor::CancelCompositorLock() {
     compositor_lock_->CancelLock();
 }
 
-void Compositor::NotifyEnd() {
-  last_ended_frame_++;
-  TRACE_EVENT_ASYNC_END0("ui", "Compositor::Draw", last_ended_frame_);
-  waiting_on_compositing_end_ = false;
-  if (draw_on_compositing_end_) {
-    draw_on_compositing_end_ = false;
-
-    // Call ScheduleDraw() instead of Draw() in order to allow other
-    // CompositorObservers to be notified before starting another
-    // draw cycle.
-    ScheduleDraw();
-  }
-  FOR_EACH_OBSERVER(CompositorObserver,
-                    observer_list_,
-                    OnCompositingEnded(this));
-}
-
 }  // namespace ui