cc: Use asynchronous set pixels API for impl-side painting.

cc/layer_tree_host_impl.cc

 // Copyright 2011 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/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 719 matching lines @@
             DCHECK(it >= 0);
         }
     }
 }
 
 bool LayerTreeHostImpl::prepareToDraw(FrameData& frame)
 {
     TRACE_EVENT0("cc", "LayerTreeHostImpl::prepareToDraw");
     DCHECK(canDraw());
 
+    if (m_tileManager)
+        m_tileManager->CheckForCompletedSetPixels();
+
     frame.renderSurfaceLayerList = &m_renderSurfaceLayerList;
     frame.renderPasses.clear();
     frame.renderPassesById.clear();
     frame.renderSurfaceLayerList->clear();
     frame.willDrawLayers.clear();
 
     if (!calculateRenderPasses(frame))
         return false;
 
     // If we return true, then we expect drawLayers() to be called before this function is called again.
@@ skipping 26 matching lines @@
 {
     return m_proxy->hasImplThread();
 }
 
 void LayerTreeHostImpl::ScheduleManageTiles()
 {
     if (m_client)
       m_client->setNeedsManageTilesOnImplThread();
 }
 
-void LayerTreeHostImpl::ScheduleRedraw()
+void LayerTreeHostImpl::ScheduleCheckForCompletedSetPixels()
 {
+    // CheckForCompletedSetPixels() should be called before we draw and
+    // preferably only once per vsync interval. For now just make sure
+    // a redraw is scheduled and call CheckForCompletedSetPixels() in
+    // prepareToDraw().
     if (m_client)
       m_client->setNeedsRedrawOnImplThread();
 }
 
 void LayerTreeHostImpl::setManagedMemoryPolicy(const ManagedMemoryPolicy& policy)
 {
     if (m_managedMemoryPolicy == policy)
         return;
 
     m_managedMemoryPolicy = policy;
@@ skipping 836 matching lines @@
     ScrollbarAnimationController* scrollbarController = layer->scrollbarAnimationController();
     double monotonicTime = (time - base::TimeTicks()).InSecondsF();
     if (scrollbarController && scrollbarController->animate(monotonicTime))
         m_client->setNeedsRedrawOnImplThread();
 
     for (size_t i = 0; i < layer->children().size(); ++i)
         animateScrollbarsRecursive(layer->children()[i], time);
 }
 
 }  // namespace cc