Make scroll offset type of float in cc

ui/gfx/gfx_tests.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 34 matching lines @@
         'geometry/box_unittest.cc',
         'geometry/cubic_bezier_unittest.cc',
         'geometry/insets_unittest.cc',
         'geometry/matrix3_unittest.cc',
         'geometry/point_unittest.cc',
         'geometry/point3_unittest.cc',
         'geometry/quad_unittest.cc',
         'geometry/r_tree_unittest.cc',
         'geometry/rect_unittest.cc',
         'geometry/safe_integer_conversions_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',
         'platform_font_mac_unittest.mm',
         'range/range_mac_unittest.mm',
         'range/range_unittest.cc',
         'range/range_win_unittest.cc',
@@ skipping 119 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'gfx_unittests',
           },
           'includes': [ '../../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }