Add a stat to the smoothness benchmark for avg number of missing tiles.

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 204 matching lines @@
                             PriorityCalculator::allowNothingCutoff())
     , m_backgroundColor(0)
     , m_hasTransparentBackground(false)
     , m_needsAnimateLayers(false)
     , m_pinchGestureActive(false)
     , m_fpsCounter(FrameRateCounter::create(m_proxy->hasImplThread()))
     , m_debugRectHistory(DebugRectHistory::create())
     , m_numImplThreadScrolls(0)
     , m_numMainThreadScrolls(0)
     , m_cumulativeNumLayersDrawn(0)
+    , m_cumulativeNumMissingTiles(0)
 {
     DCHECK(m_proxy->isImplThread());
     didVisibilityChange(this, m_visible);
 
     // TODO(nduca): For now, assume we have an active tree. This will be removed
     // in future patches.
     m_activeTree = LayerTreeImpl::create(this);
 }
 
 LayerTreeHostImpl::~LayerTreeHostImpl()
@@ skipping 310 matching lines @@
 
                 appendQuadsForLayer(targetRenderPass, *it, occlusionTracker, appendQuadsData);
             }
 
             ++m_cumulativeNumLayersDrawn;
         }
 
         if (appendQuadsData.hadOcclusionFromOutsideTargetSurface)
           targetRenderPass->has_occlusion_from_outside_target_surface = true;
 
-        if (appendQuadsData.hadMissingTiles) {
+        if (appendQuadsData.numMissingTiles) {
+            m_cumulativeNumMissingTiles += appendQuadsData.numMissingTiles;
             bool layerHasAnimatingTransform = it->screenSpaceTransformIsAnimating() || it->drawTransformIsAnimating();
             if (layerHasAnimatingTransform)
                 drawFrame = false;
         }
 
         occlusionTracker.leaveLayer(it);
     }
 
 #ifndef NDEBUG
     for (size_t i = 0; i < frame.renderPasses.size(); ++i) {
@@ skipping 1017 matching lines @@
     return fpsCounter()->currentFrameNumber();
 }
 
 void LayerTreeHostImpl::renderingStats(RenderingStats* stats) const
 {
     stats->numFramesSentToScreen = fpsCounter()->currentFrameNumber();
     stats->droppedFrameCount = fpsCounter()->droppedFrameCount();
     stats->numImplThreadScrolls = m_numImplThreadScrolls;
     stats->numMainThreadScrolls = m_numMainThreadScrolls;
     stats->numLayersDrawn = m_cumulativeNumLayersDrawn;
+    stats->numMissingTiles = m_cumulativeNumMissingTiles;
 
     if (m_tileManager)
         m_tileManager->renderingStats(stats);
 }
 
 void LayerTreeHostImpl::animateScrollbars(base::TimeTicks time)
 {
     animateScrollbarsRecursive(rootLayer(), time);
 }
 
 void LayerTreeHostImpl::animateScrollbarsRecursive(LayerImpl* layer, base::TimeTicks time)
 {
     if (!layer)
         return;
 
     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