ui: Prefer +/- operators to apply offsets.

cc/occlusion_tracker_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 "config.h"
 
 #include "cc/occlusion_tracker.h"
 
 #include "cc/layer.h"
 #include "cc/layer_animation_controller.h"
@@ skipping 887 matching lines @@
         gfx::Rect clippedLayerInChild = MathUtil::mapClippedRect(layerTransform, layer->visibleContentRect());
 
         this->visitLayer(layer, occlusion);
         this->enterContributingSurface(child, occlusion);
 
         EXPECT_EQ(gfx::Rect().ToString(), occlusion.occlusionInScreenSpace().ToString());
         EXPECT_EQ(clippedLayerInChild.ToString(), occlusion.occlusionInTargetSurface().ToString());
 
         EXPECT_TRUE(occlusion.occludedLayer(child, clippedLayerInChild));
         EXPECT_TRUE(occlusion.unoccludedLayerContentRect(child, clippedLayerInChild).IsEmpty());
-        clippedLayerInChild.Offset(-1, 0);
+        clippedLayerInChild += gfx::Vector2d(-1, 0);
         EXPECT_FALSE(occlusion.occludedLayer(child, clippedLayerInChild));
         EXPECT_FALSE(occlusion.unoccludedLayerContentRect(child, clippedLayerInChild).IsEmpty());
-        clippedLayerInChild.Offset(1, 0);
-        clippedLayerInChild.Offset(1, 0);
+        clippedLayerInChild += gfx::Vector2d(1, 0);
+        clippedLayerInChild += gfx::Vector2d(1, 0);
         EXPECT_FALSE(occlusion.occludedLayer(child, clippedLayerInChild));
         EXPECT_FALSE(occlusion.unoccludedLayerContentRect(child, clippedLayerInChild).IsEmpty());
-        clippedLayerInChild.Offset(-1, 0);
-        clippedLayerInChild.Offset(0, -1);
+        clippedLayerInChild += gfx::Vector2d(-1, 0);
+        clippedLayerInChild += gfx::Vector2d(0, -1);
         EXPECT_FALSE(occlusion.occludedLayer(child, clippedLayerInChild));
         EXPECT_FALSE(occlusion.unoccludedLayerContentRect(child, clippedLayerInChild).IsEmpty());
-        clippedLayerInChild.Offset(0, 1);
-        clippedLayerInChild.Offset(0, 1);
+        clippedLayerInChild += gfx::Vector2d(0, 1);
+        clippedLayerInChild += gfx::Vector2d(0, 1);
         EXPECT_FALSE(occlusion.occludedLayer(child, clippedLayerInChild));
         EXPECT_FALSE(occlusion.unoccludedLayerContentRect(child, clippedLayerInChild).IsEmpty());
-        clippedLayerInChild.Offset(0, -1);
+        clippedLayerInChild += gfx::Vector2d(0, -1);
 
         this->leaveContributingSurface(child, occlusion);
         this->enterLayer(parent, occlusion);
 
         EXPECT_EQ(gfx::Rect().ToString(), occlusion.occlusionInScreenSpace().ToString());
         EXPECT_EQ(gfx::Rect().ToString(), occlusion.occlusionInTargetSurface().ToString());
 
         EXPECT_FALSE(occlusion.occludedLayer(parent, gfx::Rect(75, 55, 1, 1)));
         EXPECT_RECT_EQ(gfx::Rect(75, 55, 1, 1), occlusion.unoccludedLayerContentRect(parent, gfx::Rect(75, 55, 1, 1)));
     }
@@ skipping 2139 matching lines @@
         this->visitLayer(large, occlusion);
 
         EXPECT_EQ(gfx::Rect(gfx::Point(), trackingSize).ToString(), occlusion.occlusionInScreenSpace().ToString());
         EXPECT_EQ(gfx::Rect(gfx::Point(), trackingSize).ToString(), occlusion.occlusionInTargetSurface().ToString());
     }
 };
 
 ALL_OCCLUSIONTRACKER_TEST(OcclusionTrackerTestMinimumTrackingSize);
 
 }  // anonymous namespace