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

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index 32366d3157efe2dd6c73d2d3a8e3dcb3bcbe4ce6..6ed270f3524f0bab80459973d9ac3253d7bf6bc1 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -14,7 +14,6 @@
 #include "cc/delay_based_time_source.h"
 #include "cc/font_atlas.h"
 #include "cc/frame_rate_counter.h"
-#include "cc/geometry.h"
 #include "cc/gl_renderer.h"
 #include "cc/heads_up_display_layer_impl.h"
 #include "cc/layer_iterator.h"
@@ -998,7 +997,7 @@ void LayerTreeHostImpl::updateMaxScrollOffset()
         viewBounds.Scale(1 / m_pinchZoomViewport.pageScaleDelta());
     }
 
-    gfx::Vector2dF maxScroll = BottomRight(gfx::Rect(contentBounds)) - BottomRight(gfx::RectF(viewBounds));
+    gfx::Vector2dF maxScroll = gfx::Rect(contentBounds).BottomRight() - gfx::RectF(viewBounds).BottomRight();
     maxScroll.Scale(1 / m_deviceScaleFactor);
 
     // The viewport may be larger than the contents in some cases, such as
@@ -1291,7 +1290,7 @@ void LayerTreeHostImpl::computePinchZoomDeltas(ScrollAndScaleSet* scrollInfo)
     gfx::Vector2dF scrollEnd = scrollBegin + anchorOffset;
     scrollEnd.Scale(m_pinchZoomViewport.minPageScaleFactor() / scaleBegin);
     scrollEnd -= anchorOffset;
-    scrollEnd.ClampToMax(BottomRight(gfx::RectF(scaledContentsSize)) - BottomRight(gfx::Rect(m_deviceViewportSize)));
+    scrollEnd.ClampToMax(gfx::RectF(scaledContentsSize).BottomRight() - gfx::Rect(m_deviceViewportSize).BottomRight());
     scrollEnd.ClampToMin(gfx::Vector2d());
     scrollEnd.Scale(1 / pageScaleDeltaToSend);
     scrollEnd.Scale(m_deviceScaleFactor);