gfx: Converge scale precision related differences to single class.

ui/gfx/geometry/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 component("geometry") {
   sources = [
     "../gfx_export.h",
+    "../switches.cc",
+    "../switches.h",
     "box_f.cc",
     "box_f.h",
     "cubic_bezier.cc",
     "cubic_bezier.h",
     "dip_util.cc",
     "dip_util.h",
     "insets.cc",
     "insets.h",
     "insets_base.h",
     "insets_f.cc",
@@ skipping 10 matching lines @@
     "point_f.h",
     "quad_f.cc",
     "quad_f.h",
     "rect.cc",
     "rect.h",
     "rect_conversions.cc",
     "rect_conversions.h",
     "rect_f.cc",
     "rect_f.h",
     "safe_integer_conversions.h",
+    "scale.cc",
+    "scale.h",
     "scroll_offset.cc",
     "scroll_offset.h",
     "size.cc",
     "size.h",
     "size_conversions.cc",
     "size_conversions.h",
     "size_f.cc",
     "size_f.h",
     "vector2d.cc",
     "vector2d.h",
@@ skipping 10 matching lines @@
   deps = [
     "//base",
     "//ui/gfx:gfx_export",
   ]
 
   if (is_android && !is_debug) {
     configs -= [ "//build/config/compiler:optimize" ]
     configs += [ "//build/config/compiler:optimize_max" ]
   }
 }