ui: Add methods to Rect classes to get points at each of the rect's corners.

cc/page_scale_animation.cc

Index: cc/page_scale_animation.cc
diff --git a/cc/page_scale_animation.cc b/cc/page_scale_animation.cc
index e1d5f45436eeae4a27b6e37378c776e2d5ff654e..b773d9ea8e799e2bac07197c624cfcbcfac5cfcd 100644
--- a/cc/page_scale_animation.cc
+++ b/cc/page_scale_animation.cc
@@ -5,7 +5,6 @@
 #include "cc/page_scale_animation.h"
 
 #include "base/logging.h"
-#include "cc/geometry.h"
 #include "ui/gfx/point_f.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/vector2d_conversions.h"
@@ -117,7 +116,7 @@ void PageScaleAnimation::inferTargetAnchorFromScrollOffsets()
 
 void PageScaleAnimation::clampTargetScrollOffset()
 {
-    gfx::Vector2dF maxScrollOffset = BottomRight(gfx::RectF(m_rootLayerSize)) - BottomRight(gfx::RectF(targetViewportSize()));
+    gfx::Vector2dF maxScrollOffset = gfx::RectF(m_rootLayerSize).BottomRight() - gfx::RectF(targetViewportSize()).BottomRight();
     m_targetScrollOffset.ClampToMin(gfx::Vector2dF());
     m_targetScrollOffset.ClampToMax(maxScrollOffset);
 }