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..f2f1ccc5004eebe64817eed323641f1f329067fc 100644
--- a/ui/gfx/render_text_mac.cc
+++ b/ui/gfx/render_text_mac.cc
@@ -232,13 +232,10 @@ void RenderTextMac::ComputeRuns() {
   CFArrayRef ct_runs = CTLineGetGlyphRuns(line_);
   const CFIndex ct_runs_count = CFArrayGetCount(ct_runs);
 
-  Point offset(GetTextOrigin());
   // Skia will draw glyphs with respect to the baseline.
-  offset.Offset(0, common_baseline_);
-
-  const SkScalar x = SkIntToScalar(offset.x());
-  const SkScalar y = SkIntToScalar(offset.y());
-  SkPoint run_origin = SkPoint::Make(offset.x(), offset.y());
+  const SkScalar x = SkIntToScalar(GetTextOffset().x());
+  const SkScalar y = SkIntToScalar(GetTextOffset().y() + common_baseline_);
+  SkPoint run_origin = SkPoint::Make(x, y);
 
   const CFRange empty_cf_range = CFRangeMake(0, 0);
   for (CFIndex i = 0; i < ct_runs_count; ++i) {