Add Vector2d classes that represent offsets, instead of using Point.

ui/gfx/render_text.cc

Index: ui/gfx/render_text.cc
diff --git a/ui/gfx/render_text.cc b/ui/gfx/render_text.cc
index a8246c2d6b1f83905b7092cd9266f2547a179964..4fe3702b9d940f1dd0509841da6bd80f16d55e86 100644
--- a/ui/gfx/render_text.cc
+++ b/ui/gfx/render_text.cc
@@ -406,7 +406,7 @@ void RenderText::SetText(const string16& text) {
 void RenderText::SetHorizontalAlignment(HorizontalAlignment alignment) {
   if (horizontal_alignment_ != alignment) {
     horizontal_alignment_ = alignment;
-    display_offset_ = Point();
+    display_offset_ = Vector2d();
     cached_bounds_and_offset_valid_ = false;
   }
 }
@@ -765,7 +765,7 @@ RenderText::RenderText()
       cached_bounds_and_offset_valid_(false) {
 }
 
-const Point& RenderText::GetUpdatedDisplayOffset() {
+const Vector2d& RenderText::GetUpdatedDisplayOffset() {
   UpdateCachedBoundsAndOffset();
   return display_offset_;
 }
@@ -847,25 +847,25 @@ Point RenderText::GetTextOrigin() {
 }
 
 Point RenderText::ToTextPoint(const Point& point) {
-  return point.Subtract(GetTextOrigin());
+  return point.Subtract(GetTextOrigin().DistanceFromOrigin());
 }
 
 Point RenderText::ToViewPoint(const Point& point) {
-  return point.Add(GetTextOrigin());
+  return point.Add(GetTextOrigin().DistanceFromOrigin());
 }
 
 int RenderText::GetContentWidth() {
   return GetStringSize().width() + (cursor_enabled_ ? 1 : 0);
 }
 
-Point RenderText::GetAlignmentOffset() {
+Vector2d RenderText::GetAlignmentOffset() {
   if (horizontal_alignment() != ALIGN_LEFT) {
     int x_offset = display_rect().width() - GetContentWidth();
     if (horizontal_alignment() == ALIGN_CENTER)
       x_offset /= 2;
-    return Point(x_offset, 0);
+    return Vector2d(x_offset, 0);
   }
-  return Point();
+  return Vector2d();
 }
 
 Point RenderText::GetOriginForDrawing() {
@@ -1001,7 +1001,7 @@ void RenderText::UpdateCachedBoundsAndOffset() {
       delta_offset = negate_rtl * (display_width - (content_width + offset));
   }
 
-  display_offset_.Offset(delta_offset, 0);
+  display_offset_.Grow(delta_offset, 0);
   cursor_bounds_.Offset(delta_offset, 0);
 }