[Android] Port Scroller.java to C++ and use for fling animations

ui/ui_unittests.gyp

 # Copyright 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': [
     {
@@ skipping 204 matching lines @@
           },
           # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
           'msvs_disabled_warnings': [ 4267, ],
         }],
         ['OS != "mac" and OS != "ios"', {
           'sources': [
             'gfx/transform_unittest.cc',
             'gfx/interpolated_transform_unittest.cc',
           ],
         }],
+        ['OS == "android"', {
+          'sources': [
+            'gfx/android/scroller_unittest.cc',
+          ],
+        }],
         ['OS == "android" and gtest_target_type == "shared_library"', {
           'dependencies': [
             '../testing/android/native_test.gyp:native_test_native_code',
           ],
         }],
         ['desktop_linux == 1 or chromeos == 1 or OS == "ios"', {
           'dependencies': [
             'base/strings/ui_strings.gyp:ui_unittest_strings',
           ],
         }],
@@ skipping 109 matching lines @@
           'variables': {
             'test_suite_name': 'ui_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)ui_unittests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }