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

ui/gfx/render_text.h

Index: ui/gfx/render_text.h
diff --git a/ui/gfx/render_text.h b/ui/gfx/render_text.h
index 3ba9f872e7c554c01c0ab2597f5d36e318f02f6c..1a1e40094fdcec4dc598fc37d69fd98c59d1656d 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -24,6 +24,7 @@
 #include "ui/gfx/selection_model.h"
 #include "ui/gfx/shadow_value.h"
 #include "ui/gfx/text_constants.h"
+#include "ui/gfx/vector2d.h"
 
 class SkCanvas;
 class SkDrawLooper;
@@ -294,7 +295,7 @@ class UI_EXPORT RenderText {
  protected:
   RenderText();
 
-  const Point& GetUpdatedDisplayOffset();
+  const Vector2d& GetUpdatedDisplayOffset();
 
   void set_cached_bounds_and_offset_valid(bool valid) {
     cached_bounds_and_offset_valid_ = valid;
@@ -380,7 +381,7 @@ class UI_EXPORT RenderText {
   int GetContentWidth();
 
   // Returns display offset based on current text alignment.
-  Point GetAlignmentOffset();
+  Vector2d GetAlignmentOffset();
 
   // Returns the origin point for drawing text. Does not account for font
   // baseline, as needed by Skia.
@@ -504,7 +505,7 @@ class UI_EXPORT RenderText {
 
   // The offset for the text to be drawn, relative to the display area.
   // Get this point with GetUpdatedDisplayOffset (or risk using a stale value).
-  Point display_offset_;
+  Vector2d display_offset_;
 
   // The cached bounds and offset are invalidated by changes to the cursor,
   // selection, font, and other operations that adjust the visible text bounds.