Use the scheduler to drive the Sky compositor

sky/compositor/layer_host.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 "sky/compositor/layer_host.h"
 
+#include "base/message_loop/message_loop.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/gpu/gl_context.h"
 #include "mojo/services/public/cpp/surfaces/surfaces_utils.h"
 #include "mojo/skia/ganesh_context.h"
 #include "sky/compositor/layer.h"
 
 namespace sky {
 
 LayerHost::LayerHost(LayerHostClient* client)
     : client_(client),
       surface_holder_(this, client->GetShell()),
       gl_context_(mojo::GLContext::Create(client->GetShell())),
       ganesh_context_(gl_context_),
-      resource_manager_(gl_context_) {
+      resource_manager_(gl_context_),
+      scheduler_(this, base::MessageLoop::current()->task_runner()) {
+  scheduler_.UpdateVSync(
+      TimeInterval(base::TimeTicks(), base::TimeDelta::FromSecondsD(1.0 / 60)));
 }
 
 LayerHost::~LayerHost() {
 }
 
 void LayerHost::SetNeedsAnimate() {
+  scheduler_.SetNeedsFrame();
 }
 
 void LayerHost::SetRootLayer(scoped_refptr<Layer> layer) {
   DCHECK(!root_layer_.get());
   root_layer_ = layer;
   root_layer_->set_host(this);
 }
 
-void LayerHost::OnReadyForNextFrame() {
-  client_->BeginFrame();
-  root_layer_->Display();
-  Upload(root_layer_.get());
-}
-
 void LayerHost::OnSurfaceIdAvailable(mojo::SurfaceIdPtr surface_id) {
   client_->OnSurfaceIdAvailable(surface_id.Pass());
 }
 
 void LayerHost::ReturnResources(
     mojo::Array<mojo::ReturnedResourcePtr> resources) {
   resource_manager_.ReturnResources(resources.Pass());
 }
 
+void LayerHost::BeginFrame(base::TimeTicks frame_time,
+                           base::TimeTicks deadline) {
+  client_->BeginFrame(frame_time);
+  root_layer_->Display();
+  Upload(root_layer_.get());
+}
+
 void LayerHost::Upload(Layer* layer) {
   gfx::Size size = layer->size();
   surface_holder_.SetSize(size);
 
   mojo::FramePtr frame = mojo::Frame::New();
   frame->resources.resize(0u);
 
   mojo::Rect bounds;
   bounds.width = size.width();
   bounds.height = size.height();
@@ skipping 32 matching lines @@
 
   frame->resources.push_back(resource.Pass());
   quad->texture_quad_state = texture_state.Pass();
   pass->quads.push_back(quad.Pass());
 
   frame->passes.push_back(pass.Pass());
   surface_holder_.SubmitFrame(frame.Pass());
 }
 
 }  // namespace sky