gfx: Converge scale precision related differences to single class.

ui/gfx/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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 511 matching lines @@
       "font_list_unittest.cc",
       "geometry/box_unittest.cc",
       "geometry/cubic_bezier_unittest.cc",
       "geometry/insets_unittest.cc",
       "geometry/matrix3_unittest.cc",
       "geometry/point3_unittest.cc",
       "geometry/point_unittest.cc",
       "geometry/quad_unittest.cc",
       "geometry/rect_unittest.cc",
       "geometry/safe_integer_conversions_unittest.cc",
+      "geometry/scale_unittest.cc",
       "geometry/scroll_offset_unittest.cc",
       "geometry/size_unittest.cc",
       "geometry/vector2d_unittest.cc",
       "geometry/vector3d_unittest.cc",
       "image/image_mac_unittest.mm",
       "image/image_util_unittest.cc",
       "mac/coordinate_conversion_unittest.mm",
       "nine_image_painter_unittest.cc",
       "platform_font_mac_unittest.mm",
       "range/range_mac_unittest.mm",
@@ skipping 84 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }