Use a bezier timing function for the overview mode animation

ui/gfx/gfx.gyp

 # Copyright (c) 2013 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': [
     {
       'target_name': 'gfx_geometry',
       'type': '<(component)',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
       ],
       'defines': [
         'GFX_IMPLEMENTATION',
       ],
       'sources': [
         'geometry/box_f.cc',
         'geometry/box_f.h',
+        'geometry/cubic_bezier.h',
+        'geometry/cubic_bezier.cc',
         'geometry/insets.cc',
         'geometry/insets.h',
         'geometry/insets_base.h',
         'geometry/insets_f.cc',
         'geometry/insets_f.h',
         'geometry/matrix3_f.cc',
         'geometry/matrix3_f.h',
         'geometry/point.cc',
         'geometry/point.h',
         'geometry/point3_f.cc',
@@ skipping 38 matching lines @@
       'target_name': 'gfx_geometry_unittests',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/base/base.gyp:test_support_base',
         '<(DEPTH)/testing/gtest.gyp:gtest',
         'gfx_geometry',
       ],
       'sources': [
         '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/rect_unittest.cc',
         'geometry/safe_integer_conversions_unittest.cc',
         'geometry/size_unittest.cc',
         'geometry/vector2d_unittest.cc',
         'geometry/vector3d_unittest.cc',
@@ skipping 422 matching lines @@
          'variables': {
            'jni_gen_package': 'ui/gfx',
            'jni_generator_ptr_type': 'long'
          },
          'includes': [ '../../build/jni_generator.gypi' ],
        },
      ],
     }],
   ],
 }