Refuse to show Alt+Tab UI concurrently with virtual keyboard.

ui/base/accelerators/accelerator.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/base/accelerators/accelerator.h"
 
 #include <stdint.h>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/events/event.h"
 #include "ui/strings/grit/ui_strings.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #if !defined(OS_WIN) && (defined(USE_AURA) || defined(OS_MACOSX))
 #include "ui/events/keycodes/keyboard_code_conversion.h"
 #endif
 
 namespace ui {
 
 namespace {
 
-const int kEventFlagsMask = ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN |
+const int kModifierMask = ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN |
                             ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN;
 
-const int kEventFlagsWithRepeatMask = ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN |
-                                      ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN |
-                                      ui::EF_IS_REPEAT;
+const int kInterestingFlagsMask =
+    kModifierMask | ui::EF_IS_SYNTHESIZED | ui::EF_IS_REPEAT;
 
 }  // namespace
 
 Accelerator::Accelerator()
     : key_code_(ui::VKEY_UNKNOWN), type_(ui::ET_KEY_PRESSED), modifiers_(0) {}
 
 Accelerator::Accelerator(KeyboardCode keycode, int modifiers)
     : key_code_(keycode),
       type_(ui::ET_KEY_PRESSED),
-      modifiers_(modifiers & kEventFlagsWithRepeatMask) {}
+      modifiers_(modifiers & kInterestingFlagsMask) {}
 
 Accelerator::Accelerator(const KeyEvent& key_event)
     : key_code_(key_event.key_code()),
       type_(key_event.type()),
       // |modifiers_| may include the repeat flag.
-      modifiers_(key_event.flags() & kEventFlagsWithRepeatMask) {}
+      modifiers_(key_event.flags() & kInterestingFlagsMask) {}
 
 Accelerator::Accelerator(const Accelerator& accelerator) {
   key_code_ = accelerator.key_code_;
   type_ = accelerator.type_;
   modifiers_ = accelerator.modifiers_;
   if (accelerator.platform_accelerator_.get())
     platform_accelerator_ = accelerator.platform_accelerator_->CreateCopy();
 }
 
 Accelerator::~Accelerator() {
 }
 
 // static
 int Accelerator::MaskOutKeyEventFlags(int flags) {
-  return flags & kEventFlagsMask;
+  return flags & kModifierMask;
 }
 
 Accelerator& Accelerator::operator=(const Accelerator& accelerator) {
   if (this != &accelerator) {
     key_code_ = accelerator.key_code_;
     type_ = accelerator.type_;
     modifiers_ = accelerator.modifiers_;
     if (accelerator.platform_accelerator_.get())
       platform_accelerator_ = accelerator.platform_accelerator_->CreateCopy();
     else
@@ skipping 210 matching lines @@
 
     // Subtracting the size of the shortcut key and 1 for the '+' sign.
     shortcut_rtl.append(shortcut, 0, shortcut.length() - key_length - 1);
     shortcut.swap(shortcut_rtl);
   }
 
   return shortcut;
 }
 
 }  // namespace ui