Revert 251382 "event-rewrite: Clean up how events are rewritten."

trunk/src/chrome/browser/chromeos/event_rewriter.cc

Index: trunk/src/chrome/browser/chromeos/event_rewriter.cc
===================================================================
--- trunk/src/chrome/browser/chromeos/event_rewriter.cc	(revision 251431)
+++ trunk/src/chrome/browser/chromeos/event_rewriter.cc	(working copy)
@@ -1,907 +0,0 @@
-// 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/chromeos/event_rewriter.h"
-
-#include <X11/extensions/XInput2.h>
-#include <X11/keysym.h>
-#include <X11/XF86keysym.h>
-#include <X11/Xlib.h>
-// Get rid of macros from Xlib.h that conflicts with other parts of the code.
-#undef RootWindow
-#undef Status
-
-#include <vector>
-
-#include "ash/shell.h"
-#include "ash/wm/window_state.h"
-#include "ash/wm/window_util.h"
-#include "base/command_line.h"
-#include "base/logging.h"
-#include "base/prefs/pref_service.h"
-#include "base/strings/string_util.h"
-#include "base/sys_info.h"
-#include "chrome/browser/chromeos/keyboard_driven_event_rewriter.h"
-#include "chrome/browser/chromeos/login/login_display_host_impl.h"
-#include "chrome/browser/chromeos/login/user_manager.h"
-#include "chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h"
-#include "chrome/browser/profiles/profile_manager.h"
-#include "chrome/common/pref_names.h"
-#include "chromeos/chromeos_switches.h"
-#include "chromeos/ime/input_method_manager.h"
-#include "chromeos/ime/xkeyboard.h"
-#include "ui/aura/root_window.h"
-#include "ui/base/x/x11_util.h"
-#include "ui/events/event.h"
-#include "ui/events/event_utils.h"
-#include "ui/events/keycodes/keyboard_code_conversion_x.h"
-#include "ui/views/corewm/window_util.h"
-
-namespace {
-
-const int kBadDeviceId = -1;
-
-const char kNeo2LayoutId[] = "xkb:de:neo:ger";
-const char kCaMultixLayoutId[] = "xkb:ca:multix:fra";
-
-// A key code and a flag we should use when a key is remapped to |remap_to|.
-const struct ModifierRemapping {
-  int remap_to;
-  int flag;
-  unsigned int native_modifier;
-  ui::KeyboardCode keycode;
-  KeySym native_keysyms[4];  // left, right, shift+left, shift+right.
-} kModifierRemappings[] = {
-  { chromeos::input_method::kSearchKey, 0, Mod4Mask, ui::VKEY_LWIN,
-    { XK_Super_L, XK_Super_L, XK_Super_L, XK_Super_L }},
-  { chromeos::input_method::kControlKey, ui::EF_CONTROL_DOWN, ControlMask,
-    ui::VKEY_CONTROL,
-    { XK_Control_L, XK_Control_R, XK_Control_L, XK_Control_R }},
-  { chromeos::input_method::kAltKey, ui::EF_ALT_DOWN, Mod1Mask,
-    ui::VKEY_MENU, { XK_Alt_L, XK_Alt_R, XK_Meta_L, XK_Meta_R }},
-  { chromeos::input_method::kVoidKey, 0, 0U, ui::VKEY_UNKNOWN,
-    { XK_VoidSymbol, XK_VoidSymbol, XK_VoidSymbol, XK_VoidSymbol }},
-  { chromeos::input_method::kCapsLockKey, 0, 0U, ui::VKEY_CAPITAL,
-    { XK_Caps_Lock, XK_Caps_Lock, XK_Caps_Lock, XK_Caps_Lock }},
-  { chromeos::input_method::kEscapeKey, 0, 0U, ui::VKEY_ESCAPE,
-    { XK_Escape, XK_Escape, XK_Escape, XK_Escape }},
-};
-
-const ModifierRemapping* kModifierRemappingCtrl = &kModifierRemappings[1];
-
-// A structure for converting |native_modifier| to a pair of |flag| and
-// |pref_name|.
-const struct ModifierFlagToPrefName {
-  unsigned int native_modifier;
-  int flag;
-  const char* pref_name;
-} kModifierFlagToPrefName[] = {
-  // TODO(yusukes): When the device has a Chrome keyboard (i.e. the one without
-  // Caps Lock), we should not check kLanguageRemapCapsLockKeyTo.
-  { Mod3Mask, 0, prefs::kLanguageRemapCapsLockKeyTo },
-  { Mod4Mask, 0, prefs::kLanguageRemapSearchKeyTo },
-  { ControlMask, ui::EF_CONTROL_DOWN, prefs::kLanguageRemapControlKeyTo },
-  { Mod1Mask, ui::EF_ALT_DOWN, prefs::kLanguageRemapAltKeyTo },
-  { Mod2Mask, 0, prefs::kLanguageRemapDiamondKeyTo },
-};
-
-// Gets a remapped key for |pref_name| key. For example, to find out which
-// key Search is currently remapped to, call the function with
-// prefs::kLanguageRemapSearchKeyTo.
-const ModifierRemapping* GetRemappedKey(const std::string& pref_name,
-                                        const PrefService& pref_service) {
-  if (!pref_service.FindPreference(pref_name.c_str()))
-    return NULL;  // The |pref_name| hasn't been registered. On login screen?
-  const int value = pref_service.GetInteger(pref_name.c_str());
-  for (size_t i = 0; i < arraysize(kModifierRemappings); ++i) {
-    if (value == kModifierRemappings[i].remap_to)
-      return &kModifierRemappings[i];
-  }
-  return NULL;
-}
-
-bool IsRight(KeySym native_keysym) {
-  switch (native_keysym) {
-    case XK_Alt_R:
-    case XK_Control_R:
-    case XK_Hyper_R:
-    case XK_Meta_R:
-    case XK_Shift_R:
-    case XK_Super_R:
-      return true;
-    default:
-      break;
-  }
-  return false;
-}
-
-bool HasDiamondKey() {
-  return CommandLine::ForCurrentProcess()->HasSwitch(
-      chromeos::switches::kHasChromeOSDiamondKey);
-}
-
-bool IsMod3UsedByCurrentInputMethod() {
-  // Since both German Neo2 XKB layout and Caps Lock depend on Mod3Mask,
-  // it's not possible to make both features work. For now, we don't remap
-  // Mod3Mask when Neo2 is in use.
-  // TODO(yusukes): Remove the restriction.
-  chromeos::input_method::InputMethodManager* manager =
-      chromeos::input_method::InputMethodManager::Get();
-  return manager->GetCurrentInputMethod().id() == kNeo2LayoutId ||
-      manager->GetCurrentInputMethod().id() == kCaMultixLayoutId;
-}
-
-}  // namespace
-
-namespace chromeos {
-
-EventRewriter::EventRewriter()
-    : last_device_id_(kBadDeviceId),
-      xkeyboard_for_testing_(NULL),
-      keyboard_driven_event_rewriter_(new KeyboardDrivenEventRewriter),
-      pref_service_for_testing_(NULL) {
-  // The ash shell isn't instantiated for our unit tests.
-  if (ash::Shell::HasInstance()) {
-    ash::Shell::GetPrimaryRootWindow()->GetDispatcher()->
-        AddRootWindowObserver(this);
-  }
-  base::MessageLoopForUI::current()->AddObserver(this);
-  if (base::SysInfo::IsRunningOnChromeOS()) {
-    XInputHierarchyChangedEventListener::GetInstance()->AddObserver(this);
-  }
-  RefreshKeycodes();
-}
-
-EventRewriter::~EventRewriter() {
-  base::MessageLoopForUI::current()->RemoveObserver(this);
-  if (ash::Shell::HasInstance()) {
-    ash::Shell::GetPrimaryRootWindow()->GetDispatcher()->
-        RemoveRootWindowObserver(this);
-  }
-  if (base::SysInfo::IsRunningOnChromeOS()) {
-    XInputHierarchyChangedEventListener::GetInstance()->RemoveObserver(this);
-  }
-}
-
-EventRewriter::DeviceType EventRewriter::DeviceAddedForTesting(
-    int device_id,
-    const std::string& device_name) {
-  return DeviceAddedInternal(device_id, device_name);
-}
-
-// static
-EventRewriter::DeviceType EventRewriter::GetDeviceType(
-    const std::string& device_name) {
-  std::vector<std::string> tokens;
-  Tokenize(device_name, " .", &tokens);
-
-  // If the |device_name| contains the two words, "apple" and "keyboard", treat
-  // it as an Apple keyboard.
-  bool found_apple = false;
-  bool found_keyboard = false;
-  for (size_t i = 0; i < tokens.size(); ++i) {
-    if (!found_apple && LowerCaseEqualsASCII(tokens[i], "apple"))
-      found_apple = true;
-    if (!found_keyboard && LowerCaseEqualsASCII(tokens[i], "keyboard"))
-      found_keyboard = true;
-    if (found_apple && found_keyboard)
-      return kDeviceAppleKeyboard;
-  }
-
-  return kDeviceUnknown;
-}
-
-void EventRewriter::RewriteForTesting(XEvent* event) {
-  Rewrite(event);
-}
-
-void EventRewriter::OnKeyboardMappingChanged(const aura::RootWindow* root) {
-  RefreshKeycodes();
-}
-
-base::EventStatus EventRewriter::WillProcessEvent(
-    const base::NativeEvent& event) {
-  XEvent* xevent = event;
-  if (xevent->type == KeyPress || xevent->type == KeyRelease)
-    Rewrite(xevent);
-  else if (xevent->type == GenericEvent)
-    RewriteLocatedEvent(xevent);
-  return base::EVENT_CONTINUE;
-}
-
-void EventRewriter::DidProcessEvent(const base::NativeEvent& event) {
-}
-
-void EventRewriter::DeviceAdded(int device_id) {
-  DCHECK_NE(XIAllDevices, device_id);
-  DCHECK_NE(XIAllMasterDevices, device_id);
-  if (device_id == XIAllDevices || device_id == XIAllMasterDevices) {
-    LOG(ERROR) << "Unexpected device_id passed: " << device_id;
-    return;
-  }
-
-  int ndevices_return = 0;
-  XIDeviceInfo* device_info = XIQueryDevice(gfx::GetXDisplay(),
-                                            device_id,
-                                            &ndevices_return);
-
-  // Since |device_id| is neither XIAllDevices nor XIAllMasterDevices,
-  // the number of devices found should be either 0 (not found) or 1.
-  if (!device_info) {
-    LOG(ERROR) << "XIQueryDevice: Device ID " << device_id << " is unknown.";
-    return;
-  }
-
-  DCHECK_EQ(1, ndevices_return);
-  for (int i = 0; i < ndevices_return; ++i) {
-    DCHECK_EQ(device_id, device_info[i].deviceid);  // see the comment above.
-    DCHECK(device_info[i].name);
-    DeviceAddedInternal(device_info[i].deviceid, device_info[i].name);
-  }
-
-  XIFreeDeviceInfo(device_info);
-}
-
-void EventRewriter::DeviceRemoved(int device_id) {
-  device_id_to_type_.erase(device_id);
-}
-
-void EventRewriter::DeviceKeyPressedOrReleased(int device_id) {
-  std::map<int, DeviceType>::const_iterator iter =
-      device_id_to_type_.find(device_id);
-  if (iter == device_id_to_type_.end()) {
-    // |device_id| is unknown. This means the device was connected before
-    // booting the OS. Query the name of the device and add it to the map.
-    DeviceAdded(device_id);
-  }
-
-  last_device_id_ = device_id;
-}
-
-void EventRewriter::RefreshKeycodes() {
-  keysym_to_keycode_map_.clear();
-}
-
-KeyCode EventRewriter::NativeKeySymToNativeKeycode(KeySym keysym) {
-  if (keysym_to_keycode_map_.count(keysym))
-    return keysym_to_keycode_map_[keysym];
-
-  XDisplay* display = gfx::GetXDisplay();
-  KeyCode keycode = XKeysymToKeycode(display, keysym);
-  keysym_to_keycode_map_[keysym] = keycode;
-  return keycode;
-}
-
-bool EventRewriter::TopRowKeysAreFunctionKeys(XEvent* event) const {
-  const PrefService* prefs = GetPrefService();
-  if (prefs &&
-      prefs->FindPreference(prefs::kLanguageSendFunctionKeys) &&
-      prefs->GetBoolean(prefs::kLanguageSendFunctionKeys))
-    return true;
-
-  ash::wm::WindowState* state = ash::wm::GetActiveWindowState();
-  return state ? state->top_row_keys_are_function_keys() : false;
-}
-
-bool EventRewriter::RewriteWithKeyboardRemappingsByKeySym(
-    const KeyboardRemapping* remappings,
-    size_t num_remappings,
-    KeySym keysym,
-    unsigned int native_mods,
-    KeySym* remapped_native_keysym,
-    unsigned int* remapped_native_mods) {
-  for (size_t i = 0; i < num_remappings; ++i) {
-    const KeyboardRemapping& map = remappings[i];
-
-    if (keysym != map.input_keysym)
-      continue;
-    unsigned int matched_mods = native_mods & map.input_native_mods;
-    if (matched_mods != map.input_native_mods)
-      continue;
-
-    *remapped_native_keysym = map.output_keysym;
-    *remapped_native_mods = (native_mods & ~map.input_native_mods) |
-                            map.output_native_mods;
-    return true;
-  }
-
-  return false;
-}
-
-bool EventRewriter::RewriteWithKeyboardRemappingsByKeyCode(
-    const KeyboardRemapping* remappings,
-    size_t num_remappings,
-    KeyCode keycode,
-    unsigned int native_mods,
-    KeySym* remapped_native_keysym,
-    unsigned int* remapped_native_mods) {
-  for (size_t i = 0; i < num_remappings; ++i) {
-    const KeyboardRemapping& map = remappings[i];
-
-    KeyCode input_keycode = NativeKeySymToNativeKeycode(map.input_keysym);
-    if (keycode != input_keycode)
-      continue;
-    unsigned int matched_mods = native_mods & map.input_native_mods;
-    if (matched_mods != map.input_native_mods)
-      continue;
-
-    *remapped_native_keysym = map.output_keysym;
-    *remapped_native_mods = (native_mods & ~map.input_native_mods) |
-                            map.output_native_mods;
-    return true;
-  }
-
-  return false;
-}
-
-const PrefService* EventRewriter::GetPrefService() const {
-  if (pref_service_for_testing_)
-    return pref_service_for_testing_;
-  Profile* profile = ProfileManager::GetActiveUserProfile();
-  return profile ? profile->GetPrefs() : NULL;
-}
-
-void EventRewriter::Rewrite(XEvent* event) {
-  // Do not rewrite an event sent by ui_controls::SendKeyPress(). See
-  // crbug.com/136465.
-  if (event->xkey.send_event)
-    return;
-
-  // Keyboard driven rewriting happen first. Skip further processing if event is
-  // changed.
-  if (keyboard_driven_event_rewriter_->RewriteIfKeyboardDrivenOnLoginScreen(
-          event)) {
-    return;
-  }
-
-  RewriteModifiers(event);
-  RewriteNumPadKeys(event);
-  RewriteExtendedKeys(event);
-  RewriteFunctionKeys(event);
-}
-
-bool EventRewriter::IsAppleKeyboard() const {
-  if (last_device_id_ == kBadDeviceId)
-    return false;
-
-  // Check which device generated |event|.
-  std::map<int, DeviceType>::const_iterator iter =
-      device_id_to_type_.find(last_device_id_);
-  if (iter == device_id_to_type_.end()) {
-    LOG(ERROR) << "Device ID " << last_device_id_ << " is unknown.";
-    return false;
-  }
-
-  const DeviceType type = iter->second;
-  return type == kDeviceAppleKeyboard;
-}
-
-void EventRewriter::GetRemappedModifierMasks(
-    unsigned int original_native_modifiers,
-    unsigned int* remapped_native_modifiers) const {
-  // TODO(glotov): remove the following condition when we do not restart chrome
-  // when user logs in as guest. See Rewrite() for details.
-  if (UserManager::Get()->IsLoggedInAsGuest() &&
-      LoginDisplayHostImpl::default_host()) {
-    return;
-  }
-
-  const PrefService* pref_service = GetPrefService();
-  if (!pref_service)
-    return;
-
-  // When a diamond key is not available, a Mod2Mask should not treated as a
-  // configurable modifier because Mod2Mask may be worked as NumLock mask.
-  // (cf. http://crbug.com/173956)
-  const bool skip_mod2 = !HasDiamondKey();
-  // If Mod3 is used by the current input method, don't allow the CapsLock
-  // pref to remap it, or the keyboard behavior will be broken.
-  const bool skip_mod3 = IsMod3UsedByCurrentInputMethod();
-
-  for (size_t i = 0; i < arraysize(kModifierFlagToPrefName); ++i) {
-    if ((skip_mod2 && kModifierFlagToPrefName[i].native_modifier == Mod2Mask) ||
-        (skip_mod3 && kModifierFlagToPrefName[i].native_modifier == Mod3Mask)) {
-      continue;
-    }
-    if (original_native_modifiers &
-        kModifierFlagToPrefName[i].native_modifier) {
-      const ModifierRemapping* remapped_key =
-          GetRemappedKey(kModifierFlagToPrefName[i].pref_name, *pref_service);
-      // Rewrite Command-L/R key presses on an Apple keyboard to Control-L/R.
-      if (IsAppleKeyboard() &&
-          (kModifierFlagToPrefName[i].native_modifier == Mod4Mask)) {
-        remapped_key = kModifierRemappingCtrl;
-      }
-      if (remapped_key) {
-        *remapped_native_modifiers |= remapped_key->native_modifier;
-      } else {
-        *remapped_native_modifiers |=
-            kModifierFlagToPrefName[i].native_modifier;
-      }
-    }
-  }
-
-  unsigned int native_mask = Mod4Mask | ControlMask | Mod1Mask;
-  if (!skip_mod2)
-    native_mask |= Mod2Mask;
-  if (!skip_mod3)
-    native_mask |= Mod3Mask;
-  *remapped_native_modifiers =
-      (original_native_modifiers & ~native_mask) |
-      *remapped_native_modifiers;
-}
-
-bool EventRewriter::RewriteModifiers(XEvent* event) {
-  DCHECK(event->type == KeyPress || event->type == KeyRelease);
-  // Do nothing if we have just logged in as guest but have not restarted chrome
-  // process yet (so we are still on the login screen). In this situations we
-  // have no user profile so can not do anything useful.
-  // Note that currently, unlike other accounts, when user logs in as guest, we
-  // restart chrome process. In future this is to be changed.
-  // TODO(glotov): remove the following condition when we do not restart chrome
-  // when user logs in as guest.
-  if (UserManager::Get()->IsLoggedInAsGuest() &&
-      LoginDisplayHostImpl::default_host())
-    return false;
-
-  const PrefService* pref_service = GetPrefService();
-  if (!pref_service)
-    return false;
-
-  DCHECK_EQ(input_method::kControlKey, kModifierRemappingCtrl->remap_to);
-
-  XKeyEvent* xkey = &event->xkey;
-  KeySym keysym = XLookupKeysym(xkey, 0);
-  ui::KeyboardCode original_keycode = ui::KeyboardCodeFromNative(event);
-  ui::KeyboardCode remapped_keycode = original_keycode;
-  KeyCode remapped_native_keycode = xkey->keycode;
-
-  // First, remap |keysym|.
-  const ModifierRemapping* remapped_key = NULL;
-  switch (keysym) {
-    // On Chrome OS, XF86XK_Launch6 (F15) with Mod2Mask is sent when Diamond
-    // key is pressed.
-    case XF86XK_Launch6:
-      // When diamond key is not available, the configuration UI for Diamond
-      // key is not shown. Therefore, ignore the kLanguageRemapDiamondKeyTo
-      // syncable pref.
-      if (HasDiamondKey())
-        remapped_key =
-            GetRemappedKey(prefs::kLanguageRemapDiamondKeyTo, *pref_service);
-      // Default behavior is Ctrl key.
-      if (!remapped_key)
-        remapped_key = kModifierRemappingCtrl;
-      break;
-    // On Chrome OS, XF86XK_Launch7 (F16) with Mod3Mask is sent when Caps Lock
-    // is pressed (with one exception: when IsMod3UsedByCurrentInputMethod() is
-    // true, the key generates XK_ISO_Level3_Shift with Mod3Mask, not
-    // XF86XK_Launch7).
-    case XF86XK_Launch7:
-      remapped_key =
-          GetRemappedKey(prefs::kLanguageRemapCapsLockKeyTo, *pref_service);
-      break;
-    case XK_Super_L:
-    case XK_Super_R:
-      // Rewrite Command-L/R key presses on an Apple keyboard to Control-L/R.
-      if (IsAppleKeyboard())
-        remapped_key = kModifierRemappingCtrl;
-      else
-        remapped_key =
-            GetRemappedKey(prefs::kLanguageRemapSearchKeyTo, *pref_service);
-      // Default behavior is Super key, hence don't remap the event if the pref
-      // is unavailable.
-      break;
-    case XK_Control_L:
-    case XK_Control_R:
-      remapped_key =
-          GetRemappedKey(prefs::kLanguageRemapControlKeyTo, *pref_service);
-      break;
-    case XK_Alt_L:
-    case XK_Alt_R:
-    case XK_Meta_L:
-    case XK_Meta_R:
-      remapped_key =
-          GetRemappedKey(prefs::kLanguageRemapAltKeyTo, *pref_service);
-      break;
-    default:
-      break;
-  }
-
-  if (remapped_key) {
-    int flags = ui::EventFlagsFromNative(event);
-    remapped_keycode = remapped_key->keycode;
-    const size_t level = ((flags & ui::EF_SHIFT_DOWN) ? (1 << 1) : 0) +
-        (IsRight(keysym) ? (1 << 0) : 0);
-    const KeySym native_keysym = remapped_key->native_keysyms[level];
-    remapped_native_keycode = NativeKeySymToNativeKeycode(native_keysym);
-  }
-
-  // Next, remap modifier bits.
-  unsigned int remapped_native_modifiers = 0U;
-  GetRemappedModifierMasks(xkey->state, &remapped_native_modifiers);
-
-  // Toggle Caps Lock if the remapped key is ui::VKEY_CAPITAL, but do nothing if
-  // the original key is ui::VKEY_CAPITAL (i.e. a Caps Lock key on an external
-  // keyboard is pressed) since X can handle that case.
-  if (event->type == KeyPress &&
-      original_keycode != ui::VKEY_CAPITAL &&
-      remapped_keycode == ui::VKEY_CAPITAL) {
-    input_method::XKeyboard* xkeyboard = xkeyboard_for_testing_ ?
-        xkeyboard_for_testing_ :
-        input_method::InputMethodManager::Get()->GetXKeyboard();
-    xkeyboard->SetCapsLockEnabled(!xkeyboard->CapsLockIsEnabled());
-  }
-
-  OverwriteEvent(event, remapped_native_keycode, remapped_native_modifiers);
-  return true;
-}
-
-bool EventRewriter::RewriteNumPadKeys(XEvent* event) {
-  DCHECK(event->type == KeyPress || event->type == KeyRelease);
-  bool rewritten = false;
-  XKeyEvent* xkey = &event->xkey;
-  const KeySym keysym = XLookupKeysym(xkey, 0);
-  switch (keysym) {
-    case XK_KP_Insert:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_0),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Delete:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_Decimal),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_End:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_1),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Down:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_2),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Next:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_3),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Left:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_4),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Begin:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_5),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Right:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_6),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Home:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_7),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Up:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_8),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Prior:
-      OverwriteEvent(event, NativeKeySymToNativeKeycode(XK_KP_9),
-                     xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    case XK_KP_Divide:
-    case XK_KP_Multiply:
-    case XK_KP_Subtract:
-    case XK_KP_Add:
-    case XK_KP_Enter:
-      // Add Mod2Mask for consistency.
-      OverwriteEvent(event, xkey->keycode, xkey->state | Mod2Mask);
-      rewritten = true;
-      break;
-    default:
-      break;
-  }
-  return rewritten;
-}
-
-bool EventRewriter::RewriteExtendedKeys(XEvent* event) {
-  DCHECK(event->type == KeyPress || event->type == KeyRelease);
-  XKeyEvent* xkey = &event->xkey;
-  const KeySym keysym = XLookupKeysym(xkey, 0);
-
-  KeySym remapped_native_keysym = 0;
-  unsigned int remapped_native_mods = 0;
-  bool rewritten = false;
-
-  if (xkey->state & Mod4Mask) {
-    // Allow Search to avoid rewriting extended keys.
-    static const KeyboardRemapping kAvoidRemappings[] = {
-      { // Alt+Backspace
-        XK_BackSpace, Mod1Mask | Mod4Mask,
-        XK_BackSpace, Mod1Mask,
-      },
-      { // Control+Alt+Up
-        XK_Up, Mod1Mask | ControlMask | Mod4Mask,
-        XK_Up, Mod1Mask | ControlMask,
-      },
-      { // Alt+Up
-        XK_Up, Mod1Mask | Mod4Mask,
-        XK_Up, Mod1Mask,
-      },
-      { // Control+Alt+Down
-        XK_Down, Mod1Mask | ControlMask | Mod4Mask,
-        XK_Down, Mod1Mask | ControlMask,
-      },
-      { // Alt+Down
-        XK_Down, Mod1Mask | Mod4Mask,
-        XK_Down, Mod1Mask,
-      }
-    };
-
-    rewritten = RewriteWithKeyboardRemappingsByKeySym(
-        kAvoidRemappings,
-        arraysize(kAvoidRemappings),
-        keysym,
-        xkey->state,
-        &remapped_native_keysym,
-        &remapped_native_mods);
-  }
-
-  if (!rewritten) {
-    static const KeyboardRemapping kSearchRemappings[] = {
-      { // Search+BackSpace -> Delete
-        XK_BackSpace, Mod4Mask,
-        XK_Delete, 0
-      },
-      { // Search+Left -> Home
-        XK_Left, Mod4Mask,
-        XK_Home, 0
-      },
-      { // Search+Up -> Prior (aka PageUp)
-        XK_Up, Mod4Mask,
-        XK_Prior, 0
-      },
-      { // Search+Right -> End
-        XK_Right, Mod4Mask,
-        XK_End, 0
-      },
-      { // Search+Down -> Next (aka PageDown)
-        XK_Down, Mod4Mask,
-        XK_Next, 0
-      },
-      { // Search+Period -> Insert
-        XK_period, Mod4Mask,
-        XK_Insert, 0
-      }
-    };
-
-    rewritten = RewriteWithKeyboardRemappingsByKeySym(
-        kSearchRemappings,
-        arraysize(kSearchRemappings),
-        keysym,
-        xkey->state,
-        &remapped_native_keysym,
-        &remapped_native_mods);
-  }
-
-  if (!rewritten) {
-    static const KeyboardRemapping kNonSearchRemappings[] = {
-      { // Alt+BackSpace -> Delete
-        XK_BackSpace, Mod1Mask,
-        XK_Delete, 0
-      },
-      { // Control+Alt+Up -> Home
-        XK_Up, Mod1Mask | ControlMask,
-        XK_Home, 0
-      },
-      { // Alt+Up -> Prior (aka PageUp)
-        XK_Up, Mod1Mask,
-        XK_Prior, 0
-      },
-      { // Control+Alt+Down -> End
-        XK_Down, Mod1Mask | ControlMask,
-        XK_End, 0
-      },
-      { // Alt+Down -> Next (aka PageDown)
-        XK_Down, Mod1Mask,
-        XK_Next, 0
-      }
-    };
-
-    rewritten = RewriteWithKeyboardRemappingsByKeySym(
-        kNonSearchRemappings,
-        arraysize(kNonSearchRemappings),
-        keysym,
-        xkey->state,
-        &remapped_native_keysym,
-        &remapped_native_mods);
-  }
-
-  if (!rewritten)
-    return false;
-
-  OverwriteEvent(event,
-                 NativeKeySymToNativeKeycode(remapped_native_keysym),
-                 remapped_native_mods);
-  return true;
-}
-
-bool EventRewriter::RewriteFunctionKeys(XEvent* event) {
-  DCHECK(event->type == KeyPress || event->type == KeyRelease);
-  XKeyEvent* xkey = &event->xkey;
-  const KeySym keysym = XLookupKeysym(xkey, 0);
-
-  KeySym remapped_native_keysym = 0;
-  unsigned int remapped_native_mods = 0;
-  bool rewritten = false;
-
-  // By default the top row (F1-F12) keys are special keys for back, forward,
-  // brightness, volume, etc. However, windows for v2 apps can optionally
-  // request raw function keys for these keys.
-  bool top_row_keys_are_special_keys = !TopRowKeysAreFunctionKeys(event);
-
-  if ((xkey->state & Mod4Mask) && top_row_keys_are_special_keys) {
-    // Allow Search to avoid rewriting F1-F12.
-    static const KeyboardRemapping kFkeysToFkeys[] = {
-      { XK_F1, Mod4Mask, XK_F1, },
-      { XK_F2, Mod4Mask, XK_F2, },
-      { XK_F3, Mod4Mask, XK_F3, },
-      { XK_F4, Mod4Mask, XK_F4, },
-      { XK_F5, Mod4Mask, XK_F5, },
-      { XK_F6, Mod4Mask, XK_F6, },
-      { XK_F7, Mod4Mask, XK_F7, },
-      { XK_F8, Mod4Mask, XK_F8, },
-      { XK_F9, Mod4Mask, XK_F9, },
-      { XK_F10, Mod4Mask, XK_F10, },
-      { XK_F11, Mod4Mask, XK_F11, },
-      { XK_F12, Mod4Mask, XK_F12, },
-    };
-
-    rewritten = RewriteWithKeyboardRemappingsByKeySym(
-        kFkeysToFkeys,
-        arraysize(kFkeysToFkeys),
-        keysym,
-        xkey->state,
-        &remapped_native_keysym,
-        &remapped_native_mods);
-  }
-
-  if (!rewritten) {
-    static const KeyboardRemapping kFkeysToSpecialKeys[] = {
-      { XK_F1, 0, XF86XK_Back, 0 },
-      { XK_F2, 0, XF86XK_Forward, 0 },
-      { XK_F3, 0, XF86XK_Reload, 0 },
-      { XK_F4, 0, XF86XK_LaunchB, 0 },
-      { XK_F5, 0, XF86XK_LaunchA, 0 },
-      { XK_F6, 0, XF86XK_MonBrightnessDown, 0 },
-      { XK_F7, 0, XF86XK_MonBrightnessUp, 0 },
-      { XK_F8, 0, XF86XK_AudioMute, 0 },
-      { XK_F9, 0, XF86XK_AudioLowerVolume, 0 },
-      { XK_F10, 0, XF86XK_AudioRaiseVolume, 0 },
-    };
-
-    if (top_row_keys_are_special_keys) {
-      // Rewrite the F1-F12 keys on a Chromebook keyboard to special keys.
-      rewritten = RewriteWithKeyboardRemappingsByKeySym(
-          kFkeysToSpecialKeys,
-          arraysize(kFkeysToSpecialKeys),
-          keysym,
-          xkey->state,
-          &remapped_native_keysym,
-          &remapped_native_mods);
-    } else if (xkey->state & Mod4Mask) {
-      // Use Search + F1-F12 for the special keys.
-      rewritten = RewriteWithKeyboardRemappingsByKeySym(
-          kFkeysToSpecialKeys,
-          arraysize(kFkeysToSpecialKeys),
-          keysym,
-          xkey->state & !Mod4Mask,
-          &remapped_native_keysym,
-          &remapped_native_mods);
-    }
-  }
-
-  if (!rewritten && (xkey->state & Mod4Mask)) {
-    // Remap Search+<number> to F<number>.
-    // We check the keycode here instead of the keysym, as these keys have
-    // different keysyms when modifiers are pressed, such as shift.
-
-    // TODO(danakj): On some i18n keyboards, these choices will be bad and we
-    // should make layout-specific choices here. For eg. on a french keyboard
-    // "-" and "6" are the same key, so F11 will not be accessible.
-    static const KeyboardRemapping kNumberKeysToFkeys[] = {
-      { XK_1, Mod4Mask, XK_F1, 0 },
-      { XK_2, Mod4Mask, XK_F2, 0 },
-      { XK_3, Mod4Mask, XK_F3, 0 },
-      { XK_4, Mod4Mask, XK_F4, 0 },
-      { XK_5, Mod4Mask, XK_F5, 0 },
-      { XK_6, Mod4Mask, XK_F6, 0 },
-      { XK_7, Mod4Mask, XK_F7, 0 },
-      { XK_8, Mod4Mask, XK_F8, 0 },
-      { XK_9, Mod4Mask, XK_F9, 0 },
-      { XK_0, Mod4Mask, XK_F10, 0 },
-      { XK_minus, Mod4Mask, XK_F11, 0 },
-      { XK_equal, Mod4Mask, XK_F12, 0 }
-    };
-
-    rewritten = RewriteWithKeyboardRemappingsByKeyCode(
-        kNumberKeysToFkeys,
-        arraysize(kNumberKeysToFkeys),
-        xkey->keycode,
-        xkey->state,
-        &remapped_native_keysym,
-        &remapped_native_mods);
-  }
-
-  if (!rewritten)
-    return false;
-
-  OverwriteEvent(event,
-                 NativeKeySymToNativeKeycode(remapped_native_keysym),
-                 remapped_native_mods);
-  return true;
-}
-
-void EventRewriter::RewriteLocatedEvent(XEvent* event) {
-  DCHECK_EQ(GenericEvent, event->type);
-  XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(event->xcookie.data);
-  DCHECK(xievent->evtype == XI_ButtonPress ||
-         xievent->evtype == XI_ButtonRelease);
-
-  // First, remap modifier masks.
-  unsigned int remapped_native_modifiers = 0U;
-  GetRemappedModifierMasks(xievent->mods.effective, &remapped_native_modifiers);
-  xievent->mods.effective = remapped_native_modifiers;
-
-  // Then, remap Alt+Button1 to Button3.
-  if ((xievent->evtype == XI_ButtonPress ||
-       pressed_device_ids_.count(xievent->sourceid)) &&
-      (xievent->mods.effective & Mod1Mask) && xievent->detail == Button1) {
-    xievent->mods.effective &= ~Mod1Mask;
-    xievent->detail = Button3;
-    if (xievent->evtype == XI_ButtonRelease) {
-      // On the release clear the left button from the existing state and the
-      // mods, and set the right button.
-      XISetMask(xievent->buttons.mask, Button3);
-      XIClearMask(xievent->buttons.mask, Button1);
-      xievent->mods.effective &= ~Button1Mask;
-      pressed_device_ids_.erase(xievent->sourceid);
-    } else {
-      pressed_device_ids_.insert(xievent->sourceid);
-    }
-  }
-}
-
-void EventRewriter::OverwriteEvent(XEvent* event,
-                                   unsigned int new_native_keycode,
-                                   unsigned int new_native_state) {
-  DCHECK(event->type == KeyPress || event->type == KeyRelease);
-  XKeyEvent* xkey = &event->xkey;
-  xkey->keycode = new_native_keycode;
-  xkey->state = new_native_state;
-}
-
-EventRewriter::DeviceType EventRewriter::DeviceAddedInternal(
-    int device_id,
-    const std::string& device_name) {
-  const DeviceType type = EventRewriter::GetDeviceType(device_name);
-  if (type == kDeviceAppleKeyboard) {
-    VLOG(1) << "Apple keyboard '" << device_name << "' connected: "
-            << "id=" << device_id;
-  }
-  // Always overwrite the existing device_id since the X server may reuse a
-  // device id for an unattached device.
-  device_id_to_type_[device_id] = type;
-  return type;
-}
-
-}  // namespace chromeos