cc: Guard overdraw metrics behind the --trace-overdraw command-line flag.

cc/quad_culler_unittest.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/quad_culler.h"
 
 #include "cc/append_quads_data.h"
 #include "cc/layer_tiling_data.h"
 #include "cc/math_util.h"
 #include "cc/occlusion_tracker.h"
@@ skipping 203 matching lines @@
 
     scoped_ptr<TiledLayerImpl> rootLayer = makeLayer(0, rootTransform, rootRect, 1, true, gfx::Rect(), renderSurfaceLayerList);
     scoped_ptr<TiledLayerImpl> childLayer = makeLayer(rootLayer.get(), childTransform, childRect, 1, true, gfx::Rect(), renderSurfaceLayerList);
     TestOcclusionTrackerImpl occlusionTracker(gfx::Rect(-100, -100, 1000, 1000));
     LayerIteratorType it = LayerIteratorType::begin(&renderSurfaceLayerList);
 
     appendQuads(quadList, sharedStateList, childLayer.get(), it, occlusionTracker);
     appendQuads(quadList, sharedStateList, rootLayer.get(), it, occlusionTracker);
     EXPECT_EQ(quadList.size(), 2u);
 
-    EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnOpaque(), 20000, 1);
+    EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnOpaque(), 20363, 1);
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnTranslucent(), 0, 1);
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsCulledForDrawing(), 0, 1);
 }
 
 TEST(QuadCullerTest, verifyCullCenterTileNonIntegralSize2)
 {
     DECLARE_AND_INITIALIZE_TEST_QUADS
 
     // Make the child's quad slightly smaller than, and centred over, the root layer tile.
     // Verify the child does not cause the quad below to be culled due to rounding.
     childTransform.translate(100.1, 100.1);
     childTransform.scale(0.982);
 
     WebTransformationMatrix rootTransform;
     rootTransform.translate(100, 100);
 
     rootRect = childRect = gfx::Rect(0, 0, 100, 100);
 
     scoped_ptr<TiledLayerImpl> rootLayer = makeLayer(0, rootTransform, rootRect, 1, true, gfx::Rect(), renderSurfaceLayerList);
     scoped_ptr<TiledLayerImpl> childLayer = makeLayer(rootLayer.get(), childTransform, childRect, 1, true, gfx::Rect(), renderSurfaceLayerList);
     TestOcclusionTrackerImpl occlusionTracker(gfx::Rect(-100, -100, 1000, 1000));
     LayerIteratorType it = LayerIteratorType::begin(&renderSurfaceLayerList);
 
     appendQuads(quadList, sharedStateList, childLayer.get(), it, occlusionTracker);
     appendQuads(quadList, sharedStateList, rootLayer.get(), it, occlusionTracker);
     EXPECT_EQ(quadList.size(), 2u);
 
-    EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnOpaque(), 20000, 1);
+    EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnOpaque(), 19643, 1);
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnTranslucent(), 0, 1);
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsCulledForDrawing(), 0, 1);
 }
 
 TEST(QuadCullerTest, verifyCullChildLinesUpBottomRight)
 {
     DECLARE_AND_INITIALIZE_TEST_QUADS
 
     childTransform.translate(100, 100);
 
@@ skipping 196 matching lines @@
     appendQuads(quadList, sharedStateList, childLayer.get(), it, occlusionTracker);
     appendQuads(quadList, sharedStateList, rootLayer.get(), it, occlusionTracker);
     EXPECT_EQ(quadList.size(), 9u);
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnOpaque(), 0, 1);
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsDrawnTranslucent(), 0, 1);
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsCulledForDrawing(), 0, 1);
 }
 
 }  // namespace
 }  // namespace cc