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

cc/tiled_layer_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/tiled_layer_impl.h"
 
 #include "base/basictypes.h"
 #include "base/stringprintf.h"
 #include "cc/append_quads_data.h"
 #include "cc/checkerboard_draw_quad.h"
@@ skipping 142 matching lines @@
             if (!tile || !tile->resourceId()) {
                 if (drawCheckerboardForMissingTiles()) {
                     SkColor checkerColor;
                     if (showDebugBorders())
                         checkerColor = tile ? DebugColors::InvalidatedTileCheckerboardColor() : DebugColors::EvictedTileCheckerboardColor();
                     else
                         checkerColor = DebugColors::DefaultCheckerboardColor();
 
                     scoped_ptr<CheckerboardDrawQuad> checkerboardQuad = CheckerboardDrawQuad::Create();
                     checkerboardQuad->SetNew(sharedQuadState, tileRect, checkerColor);
-                    appendQuadsData.hadMissingTiles |= quadSink.append(checkerboardQuad.PassAs<DrawQuad>(), appendQuadsData);
+                    if (quadSink.append(checkerboardQuad.PassAs<DrawQuad>(), appendQuadsData))
+                        appendQuadsData.numMissingTiles++;
                 } else {
                     scoped_ptr<SolidColorDrawQuad> solidColorQuad = SolidColorDrawQuad::Create();
                     solidColorQuad->SetNew(sharedQuadState, tileRect, backgroundColor());
-                    appendQuadsData.hadMissingTiles |= quadSink.append(solidColorQuad.PassAs<DrawQuad>(), appendQuadsData);
+                    if (quadSink.append(solidColorQuad.PassAs<DrawQuad>(), appendQuadsData))
+                        appendQuadsData.numMissingTiles++;
                 }
                 continue;
             }
 
             gfx::Rect tileOpaqueRect = contentsOpaque() ? tileRect : gfx::IntersectRects(tile->opaqueRect(), contentRect);
 
             // Keep track of how the top left has moved, so the texture can be
             // offset the same amount.
             gfx::Vector2d displayOffset = tileRect.origin() - displayRect.origin();
             gfx::Vector2d textureOffset = m_tiler->textureOffset(i, j) + displayOffset;
@@ skipping 62 matching lines @@
 {
     m_tiler->reset();
 }
 
 const char* TiledLayerImpl::layerTypeAsString() const
 {
     return "ContentLayer";
 }
 
 }  // namespace cc