cc: Make scroll compensation take integer snapping into account

Scroll layers are snapped to integer coordinates, but fixed position
layers that compensated for that scroll weren't taking that into
consideration.

[email protected]
BUG=309179

Review URL: https://codereview.chromium.org/41603002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230988 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/gfx/transform.h b/ui/gfx/transform.h
index 3621741..5e3b8303 100644
--- a/ui/gfx/transform.h
+++ b/ui/gfx/transform.h
@@ -181,8 +181,7 @@
   //
   void FlattenTo2d();
 
-  // Returns the translation components of the matrix. It is an error to call
-  // this function if the transform does not represent only a 2d translation.
+  // Returns the x and y translation components of the matrix.
   Vector2dF To2dTranslation() const;
 
   // Applies the transformation to the point.