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

cc/picture_layer_impl.cc

 // Copyright 2012 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/picture_layer_impl.h"
 
 #include "base/time.h"
 #include "cc/append_quads_data.h"
 #include "cc/checkerboard_draw_quad.h"
 #include "cc/debug_border_draw_quad.h"
@@ skipping 68 matching lines @@
       resource = iter->resource_id();
 
     gfx::Rect geometry_rect = iter.geometry_rect();
 
     if (!resource) {
       if (drawCheckerboardForMissingTiles()) {
         // TODO(enne): Figure out how to show debug "invalidated checker" color
         scoped_ptr<CheckerboardDrawQuad> quad = CheckerboardDrawQuad::Create();
         SkColor color = DebugColors::DefaultCheckerboardColor();
         quad->SetNew(sharedQuadState, geometry_rect, color);
-        appendQuadsData.hadMissingTiles |=
-            quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
+        if (quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData))
+            appendQuadsData.numMissingTiles++;
       } else {
         scoped_ptr<SolidColorDrawQuad> quad = SolidColorDrawQuad::Create();
         quad->SetNew(sharedQuadState, geometry_rect, backgroundColor());
-        appendQuadsData.hadMissingTiles |=
-            quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
+        if (quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData))
+            appendQuadsData.numMissingTiles++;
       }
       continue;
     }
 
     gfx::RectF texture_rect = iter.texture_rect();
     gfx::Rect opaque_rect = iter->opaque_rect();
     opaque_rect.Intersect(content_rect);
 
     bool outside_left_edge = geometry_rect.x() == content_rect.x();
     bool outside_top_edge = geometry_rect.y() == content_rect.y();
@@ skipping 65 matching lines @@
       GL_RGBA,
       rect,
       tiling->contents_scale()));
 }
 
 void PictureLayerImpl::SyncFromActiveLayer(const PictureLayerImpl* other) {
   tilings_.CloneFrom(other->tilings_);
 }
 
 }  // namespace cc