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

ui/ui.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 493 matching lines @@
         'gfx/skia_util.h',
         'gfx/skia_utils_gtk.cc',
         'gfx/skia_utils_gtk.h',
         'gfx/sys_color_change_listener.cc',
         'gfx/sys_color_change_listener.h',
         'gfx/text_constants.h',
         'gfx/transform.cc',
         'gfx/transform.h',
         'gfx/transform_util.cc',
         'gfx/transform_util.h',
+        'gfx/vector2d.cc',
+        'gfx/vector2d.h',
+        'gfx/vector2d_conversions.cc',
+        'gfx/vector2d_conversions.h',
+        'gfx/vector2d_f.cc',
+        'gfx/vector2d_f.h',
         'gfx/video_decode_acceleration_support_mac.h',
         'gfx/video_decode_acceleration_support_mac.mm',
         'ui_controls/ui_controls.h',
         'ui_controls/ui_controls_aura.cc',
         'ui_controls/ui_controls_gtk.cc',
         'ui_controls/ui_controls_internal_win.cc',
         'ui_controls/ui_controls_internal_win.h',
         'ui_controls/ui_controls_mac.mm',
         'ui_controls/ui_controls_win.cc',
       ],
@@ skipping 356 matching lines @@
            },
            'dependencies': [
              '../base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
          },
        ],
     }],
   ],
 }