ui: Prefer +/- operators to apply offsets.

cc/layer_tree_host_common_unittest.cc

Index: cc/layer_tree_host_common_unittest.cc
diff --git a/cc/layer_tree_host_common_unittest.cc b/cc/layer_tree_host_common_unittest.cc
index c37a9f422d2c1bac645e74f6deed32ab00502c28..29d25b32156e1de7ebf8be3624a80ac75f3690c5 100644
--- a/cc/layer_tree_host_common_unittest.cc
+++ b/cc/layer_tree_host_common_unittest.cc
@@ -3500,8 +3500,7 @@ TEST(LayerTreeHostCommonTest, verifyLayerTransformsInHighDPI)
     gfx::RectF childDrawRect = MathUtil::mapClippedRect(child->drawTransform(), childContentBounds);
     gfx::RectF childScreenSpaceRect = MathUtil::mapClippedRect(child->screenSpaceTransform(), childContentBounds);
 
-    gfx::RectF expectedChildDrawRect(gfx::PointF(), child->bounds());
-    expectedChildDrawRect.Offset(child->position().x(), child->position().y());
+    gfx::RectF expectedChildDrawRect(child->position(), child->bounds());
     expectedChildDrawRect.Scale(deviceScaleFactor);
     EXPECT_FLOAT_RECT_EQ(expectedChildDrawRect, childDrawRect);
     EXPECT_FLOAT_RECT_EQ(expectedChildDrawRect, childScreenSpaceRect);