Do not convert from RectF to Rect by flooring.

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 63 matching lines @@
         'gfx/insets.cc',
         'gfx/insets.h',
         'gfx/point.cc',
         'gfx/point.h',
         'gfx/point_base.h',
         'gfx/point3.h',
         'gfx/rect.cc',
         'gfx/rect.h',
         'gfx/rect_base.h',
         'gfx/rect_base_impl.h',
+        'gfx/rect_conversions.cc',
+        'gfx/rect_conversions.h',
+        'gfx/safe_floor_ceil.cc',
+        'gfx/safe_floor_ceil.h',
         'gfx/scoped_ui_graphics_push_context_ios.h',
         'gfx/scoped_ui_graphics_push_context_ios.mm',
         'gfx/screen.h',
         'gfx/screen_android.cc',
         'gfx/screen_aura.cc',
         'gfx/screen_gtk.cc',
         'gfx/screen_impl.h',
         'gfx/screen_ios.mm',
         'gfx/screen_mac.mm',
         'gfx/screen_win.cc',
@@ skipping 762 matching lines @@
            ],
            'export_dependent_settings': [
              '../base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
          },
        ],
     }],
   ],
 }