Context menus on view elements should be positioned above the finger when

ui/views/controls/menu/menu_controller.cc

 // 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.
 
 #include "ui/views/controls/menu/menu_controller.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
 #include "base/run_loop.h"
 #include "base/time.h"
@@ skipping 32 matching lines @@
 // Period of the scroll timer (in milliseconds).
 static const int kScrollTimerMS = 30;
 
 // Delay, in ms, between when menus are selected are moused over and the menu
 // appears.
 static const int kShowDelay = 400;
 
 // Amount of time from when the drop exits the menu and the menu is hidden.
 static const int kCloseOnExitTime = 1200;
 
+// If a context menu is invoked by touch, we shift the menu by this offset so
+// that the finger does not obscure the menu.
+static const int kCenteredContextMenuYOffset = -15;
+
 namespace views {
 
 namespace {
 
 // Returns true if the mnemonic of |menu| matches key.
 bool MatchesMnemonic(MenuItemView* menu, char16 key) {
   return menu->GetMnemonic() == key;
 }
 
 // Returns true if |menu| doesn't have a mnemonic and first character of the its
@@ skipping 1021 matching lines @@
     const gfx::Rect& bounds,
     MenuItemView::AnchorPosition position,
     bool context_menu) {
   pending_state_.context_menu = context_menu;
   pending_state_.initial_bounds = bounds;
   if (bounds.height() > 1) {
     // Inset the bounds slightly, otherwise drag coordinates don't line up
     // nicely and menus close prematurely.
     pending_state_.initial_bounds.Inset(0, 1);
   }
+  if (position == MenuItemView::BOTTOMCENTER)
+    pending_state_.initial_bounds.Offset(0, kCenteredContextMenuYOffset);
 
   // Reverse anchor position for RTL languages.
   if (base::i18n::IsRTL()) {
     pending_state_.anchor = position == MenuItemView::TOPRIGHT ?
         MenuItemView::TOPLEFT : MenuItemView::TOPRIGHT;
   } else {
     pending_state_.anchor = position;
   }
 
   // Calculate the bounds of the monitor we'll show menus on. Do this once to
@@ skipping 1018 matching lines @@
 
 #if defined(USE_AURA)
 void MenuController::OnWindowActivated(aura::Window* active,
                                        aura::Window* old_active) {
   if (!drag_in_progress_)
     Cancel(EXIT_ALL);
 }
 #endif
 
 }  // namespace views