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

ui/gfx/render_text_mac.cc

Index: ui/gfx/render_text_mac.cc
diff --git a/ui/gfx/render_text_mac.cc b/ui/gfx/render_text_mac.cc
index 9ee069f1a60a63089c44b9b15dc59cc532c0f541..83e2ee3682e30f63e627de6608bb16caf4b26b51 100644
--- a/ui/gfx/render_text_mac.cc
+++ b/ui/gfx/render_text_mac.cc
@@ -232,9 +232,9 @@ void RenderTextMac::ComputeRuns() {
   CFArrayRef ct_runs = CTLineGetGlyphRuns(line_);
   const CFIndex ct_runs_count = CFArrayGetCount(ct_runs);
 
-  Point offset(GetTextOrigin());
+  Vector2d offset(GetTextOffset());
   // Skia will draw glyphs with respect to the baseline.
-  offset.Offset(0, common_baseline_);
+  offset.Grow(0, common_baseline_);
 
   const SkScalar x = SkIntToScalar(offset.x());
   const SkScalar y = SkIntToScalar(offset.y());