Make SingleThreadProxy a SchedulerClient

This makes ui::Compositor no longer in charge of
scheduling commits and draws, deferring it to cc::Scheduler.

Other compositors that use SingleThreadProxy are left calling composite
synchronously and now pass a flag to indicate that this is their
intention.  This patch doesn't remove synchronous composite, but now
makes it mutually exclusive with scheduling.

BUG=329552, 287250

Review URL: https://codereview.chromium.org/134623005

Cr-Commit-Position: refs/heads/master@{#288866}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288866 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 9 insertions, 31 deletions

diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 64e0982..baf1ac1 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -277,6 +277,8 @@ scoped_ptr<RenderWidgetCompositor> RenderWidgetCompositor::Create(
       cmd->HasSwitch(cc::switches::kEnablePinchVirtualViewport);
   settings.allow_antialiasing &=
       !cmd->HasSwitch(cc::switches::kDisableCompositedAntialiasing);
+  settings.single_thread_proxy_scheduler =
+      !cmd->HasSwitch(switches::kDisableSingleThreadProxyScheduler);
 
   // These flags should be mirrored by UI versions in ui/compositor/.
   settings.initial_debug_state.show_debug_borders =
@@ -409,7 +411,6 @@ scoped_ptr<RenderWidgetCompositor> RenderWidgetCompositor::Create(
 RenderWidgetCompositor::RenderWidgetCompositor(RenderWidget* widget,
                                                bool threaded)
     : threaded_(threaded),
-      suppress_schedule_composite_(false),
       widget_(widget) {
 }
 
@@ -420,27 +421,10 @@ RenderWidgetCompositor::GetInputHandler() {
   return layer_tree_host_->GetInputHandler();
 }
 
-void RenderWidgetCompositor::SetSuppressScheduleComposite(bool suppress) {
-  if (suppress_schedule_composite_ == suppress)
-    return;
-
-  if (suppress)
-    TRACE_EVENT_ASYNC_BEGIN0("gpu",
-        "RenderWidgetCompositor::SetSuppressScheduleComposite", this);
-  else
-    TRACE_EVENT_ASYNC_END0("gpu",
-        "RenderWidgetCompositor::SetSuppressScheduleComposite", this);
-  suppress_schedule_composite_ = suppress;
-}
-
 bool RenderWidgetCompositor::BeginMainFrameRequested() const {
   return layer_tree_host_->BeginMainFrameRequested();
 }
 
-void RenderWidgetCompositor::UpdateAnimations(base::TimeTicks time) {
-  layer_tree_host_->UpdateClientAnimations(time);
-}
-
 void RenderWidgetCompositor::SetNeedsDisplayOnAllLayers() {
   layer_tree_host_->SetNeedsDisplayOnAllLayers();
 }
@@ -549,7 +533,10 @@ void RenderWidgetCompositor::Initialize(cc::LayerTreeSettings settings) {
 }
 
 void RenderWidgetCompositor::setSurfaceReady() {
-  layer_tree_host_->SetLayerTreeHostClientReady();
+  // In tests without a RenderThreadImpl, don't set ready as this kicks
+  // off creating output surfaces that the test can't create.
+  if (RenderThreadImpl::current())
+    layer_tree_host_->SetLayerTreeHostClientReady();
 }
 
 void RenderWidgetCompositor::setRootLayer(const blink::WebLayer& layer) {
@@ -702,9 +689,9 @@ void RenderWidgetCompositor::compositeAndReadbackAsync(
       cc::CopyOutputRequest::CreateBitmapRequest(
           base::Bind(&CompositeAndReadbackAsyncCallback, callback));
   layer_tree_host_->root_layer()->RequestCopyOfOutput(request.Pass());
-  if (!threaded_) {
-    widget_->webwidget()->animate(0.0);
-    widget_->webwidget()->layout();
+
+  if (!threaded_ &&
+      !layer_tree_host_->settings().single_thread_proxy_scheduler) {
     layer_tree_host_->Composite(gfx::FrameTime::Now());
   }
 }
@@ -800,11 +787,6 @@ void RenderWidgetCompositor::DidCompleteSwapBuffers() {
     widget_->OnSwapBuffersComplete();
 }
 
-void RenderWidgetCompositor::ScheduleComposite() {
-  if (!suppress_schedule_composite_)
-    widget_->scheduleComposite();
-}
-
 void RenderWidgetCompositor::ScheduleAnimation() {
   widget_->scheduleAnimation();
 }
diff --git a/content/renderer/gpu/render_widget_compositor.h b/content/renderer/gpu/render_widget_compositor.h
index e0541ec..79a03b4 100644
--- a/content/renderer/gpu/render_widget_compositor.h
+++ b/content/renderer/gpu/render_widget_compositor.h
@@ -44,9 +44,7 @@ class RenderWidgetCompositor : public blink::WebLayerTreeView,
   virtual ~RenderWidgetCompositor();
 
   const base::WeakPtr<cc::InputHandler>& GetInputHandler();
-  void SetSuppressScheduleComposite(bool suppress);
   bool BeginMainFrameRequested() const;
-  void UpdateAnimations(base::TimeTicks time);
   void SetNeedsDisplayOnAllLayers();
   void SetRasterizeOnlyVisibleContent();
   void UpdateTopControlsState(cc::TopControlsState constraints,
@@ -143,7 +141,6 @@ class RenderWidgetCompositor : public blink::WebLayerTreeView,
   virtual void RateLimitSharedMainThreadContext() OVERRIDE;
 
   // cc::LayerTreeHostSingleThreadClient implementation.
-  virtual void ScheduleComposite() OVERRIDE;
   virtual void ScheduleAnimation() OVERRIDE;
   virtual void DidPostSwapBuffers() OVERRIDE;
   virtual void DidAbortSwapBuffers() OVERRIDE;
@@ -154,7 +151,6 @@ class RenderWidgetCompositor : public blink::WebLayerTreeView,
   void Initialize(cc::LayerTreeSettings settings);
 
   bool threaded_;
-  bool suppress_schedule_composite_;
   RenderWidget* widget_;
   scoped_ptr<cc::LayerTreeHost> layer_tree_host_;
 };