[Element / Autofill] Add boundsInViewportFloat() to fix <input> popup misalignment.

chrome/browser/ui/autofill/popup_controller_common.cc

 // 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.
 
 #include "chrome/browser/ui/autofill/popup_controller_common.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "content/public/browser/render_view_host.h"
@@ skipping 42 matching lines @@
   key_press_event_target_ = NULL;
 }
 
 gfx::Display PopupControllerCommon::GetDisplayNearestPoint(
     const gfx::Point& point) const {
   return gfx::Screen::GetScreenFor(container_view_)->GetDisplayNearestPoint(
       point);
 }
 
 const gfx::Rect PopupControllerCommon::RoundedElementBounds() const {
-  return gfx::ToEnclosingRect(element_bounds_);
+  return gfx::ToNearestRect(element_bounds_);
 }
 
 std::pair<int, int> PopupControllerCommon::CalculatePopupXAndWidth(
     const gfx::Display& left_display,
     const gfx::Display& right_display,
     int popup_required_width) const {
   int leftmost_display_x = left_display.bounds().x();
   int rightmost_display_x =
       right_display.GetSizeInPixel().width() + right_display.bounds().x();
 
@@ skipping 90 matching lines @@
                                bottom_right_display,
                                desired_height);
 
   return gfx::Rect(popup_x_and_width.first,
                    popup_y_and_height.first,
                    popup_x_and_width.second,
                    popup_y_and_height.second);
 }
 
 }  // namespace autofill