Revert "views: Move widget/ directory to ui/views." properly.

views/widget/native_widget_win.cc

+// Copyright (c) 2011 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 "views/widget/native_widget_win.h"
+
+#include <dwmapi.h>
+#include <shellapi.h>
+
+#include <algorithm>
+
+#include "base/bind.h"
+#include "base/string_util.h"
+#include "base/system_monitor/system_monitor.h"
+#include "base/win/scoped_gdi_object.h"
+#include "base/win/win_util.h"
+#include "base/win/windows_version.h"
+#include "ui/base/dragdrop/drag_drop_types.h"
+#include "ui/base/dragdrop/drag_source.h"
+#include "ui/base/dragdrop/os_exchange_data.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
+#include "ui/base/keycodes/keyboard_code_conversion_win.h"
+#include "ui/base/l10n/l10n_util_win.h"
+#include "ui/base/theme_provider.h"
+#include "ui/base/view_prop.h"
+#include "ui/base/win/hwnd_util.h"
+#include "ui/base/win/mouse_wheel_util.h"
+#include "ui/gfx/canvas_skia.h"
+#include "ui/gfx/canvas_skia_paint.h"
+#include "ui/gfx/compositor/compositor.h"
+#include "ui/gfx/icon_util.h"
+#include "ui/gfx/native_theme_win.h"
+#include "ui/gfx/path.h"
+#include "ui/gfx/screen.h"
+#include "ui/views/accessibility/native_view_accessibility_win.h"
+#include "ui/views/focus/accelerator_handler.h"
+#include "ui/views/focus/view_storage.h"
+#include "ui/views/ime/input_method_win.h"
+#include "ui/views/window/native_frame_view.h"
+#include "views/controls/native_control_win.h"
+#include "views/controls/textfield/native_textfield_views.h"
+#include "views/views_delegate.h"
+#include "views/widget/aero_tooltip_manager.h"
+#include "views/widget/child_window_message_processor.h"
+#include "views/widget/drop_target_win.h"
+#include "views/widget/monitor_win.h"
+#include "views/widget/native_widget_delegate.h"
+#include "views/widget/root_view.h"
+#include "views/widget/widget_delegate.h"
+
+#pragma comment(lib, "dwmapi.lib")
+
+using ui::ViewProp;
+
+namespace views {
+
+namespace {
+
+// Get the source HWND of the specified message. Depending on the message, the
+// source HWND is encoded in either the WPARAM or the LPARAM value.
+HWND GetControlHWNDForMessage(UINT message, WPARAM w_param, LPARAM l_param) {
+  // Each of the following messages can be sent by a child HWND and must be
+  // forwarded to its associated NativeControlWin for handling.
+  switch (message) {
+    case WM_NOTIFY:
+      return reinterpret_cast<NMHDR*>(l_param)->hwndFrom;
+    case WM_COMMAND:
+      return reinterpret_cast<HWND>(l_param);
+    case WM_CONTEXTMENU:
+      return reinterpret_cast<HWND>(w_param);
+    case WM_CTLCOLORBTN:
+    case WM_CTLCOLORSTATIC:
+      return reinterpret_cast<HWND>(l_param);
+  }
+  return NULL;
+}
+
+// Some messages may be sent to us by a child HWND. If this is the case, this
+// function will forward those messages on to the object associated with the
+// source HWND and return true, in which case the window procedure must not do
+// any further processing of the message. If there is no associated
+// ChildWindowMessageProcessor, the return value will be false and the WndProc
+// can continue processing the message normally.  |l_result| contains the result
+// of the message processing by the control and must be returned by the WndProc
+// if the return value is true.
+bool ProcessChildWindowMessage(UINT message,
+                               WPARAM w_param,
+                               LPARAM l_param,
+                               LRESULT* l_result) {
+  *l_result = 0;
+
+  HWND control_hwnd = GetControlHWNDForMessage(message, w_param, l_param);
+  if (IsWindow(control_hwnd)) {
+    ChildWindowMessageProcessor* processor =
+        ChildWindowMessageProcessor::Get(control_hwnd);
+    if (processor)
+      return processor->ProcessMessage(message, w_param, l_param, l_result);
+  }
+
+  return false;
+}
+
+// Enumeration callback for NativeWidget::GetAllChildWidgets(). Called for each
+// child HWND beneath the original HWND.
+BOOL CALLBACK EnumerateChildWindowsForNativeWidgets(HWND hwnd, LPARAM l_param) {
+  Widget* widget = Widget::GetWidgetForNativeView(hwnd);
+  if (widget) {
+    Widget::Widgets* widgets = reinterpret_cast<Widget::Widgets*>(l_param);
+    widgets->insert(widget);
+  }
+  return TRUE;
+}
+
+// Returns true if the WINDOWPOS data provided indicates the client area of
+// the window may have changed size. This can be caused by the window being
+// resized or its frame changing.
+bool DidClientAreaSizeChange(const WINDOWPOS* window_pos) {
+  return !(window_pos->flags & SWP_NOSIZE) ||
+         window_pos->flags & SWP_FRAMECHANGED;
+}
+
+// Callback used to notify child windows that the top level window received a
+// DWMCompositionChanged message.
+BOOL CALLBACK SendDwmCompositionChanged(HWND window, LPARAM param) {
+  SendMessage(window, WM_DWMCOMPOSITIONCHANGED, 0, 0);
+  return TRUE;
+}
+
+// Tells the window its frame (non-client area) has changed.
+void SendFrameChanged(HWND window) {
+  SetWindowPos(window, NULL, 0, 0, 0, 0,
+      SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOCOPYBITS |
+      SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOREPOSITION |
+      SWP_NOSENDCHANGING | SWP_NOSIZE | SWP_NOZORDER);
+}
+
+// Enables or disables the menu item for the specified command and menu.
+void EnableMenuItem(HMENU menu, UINT command, bool enabled) {
+  UINT flags = MF_BYCOMMAND | (enabled ? MF_ENABLED : MF_DISABLED | MF_GRAYED);
+  EnableMenuItem(menu, command, flags);
+}
+
+BOOL CALLBACK EnumChildWindowsForRedraw(HWND hwnd, LPARAM lparam) {
+  DWORD process_id;
+  GetWindowThreadProcessId(hwnd, &process_id);
+  int flags = RDW_INVALIDATE | RDW_NOCHILDREN | RDW_FRAME;
+  if (process_id == GetCurrentProcessId())
+    flags |= RDW_UPDATENOW;
+  RedrawWindow(hwnd, NULL, NULL, flags);
+  return TRUE;
+}
+
+// See comments in OnNCPaint() for details of this struct.
+struct ClipState {
+  // The window being painted.
+  HWND parent;
+
+  // DC painting to.
+  HDC dc;
+
+  // Origin of the window in terms of the screen.
+  int x;
+  int y;
+};
+
+// See comments in OnNCPaint() for details of this function.
+static BOOL CALLBACK ClipDCToChild(HWND window, LPARAM param) {
+  ClipState* clip_state = reinterpret_cast<ClipState*>(param);
+  if (GetParent(window) == clip_state->parent && IsWindowVisible(window)) {
+    RECT bounds;
+    GetWindowRect(window, &bounds);
+    ExcludeClipRect(clip_state->dc,
+      bounds.left - clip_state->x,
+      bounds.top - clip_state->y,
+      bounds.right - clip_state->x,
+      bounds.bottom - clip_state->y);
+  }
+  return TRUE;
+}
+
+// The thickness of an auto-hide taskbar in pixels.
+static const int kAutoHideTaskbarThicknessPx = 2;
+
+bool GetMonitorAndRects(const RECT& rect,
+                        HMONITOR* monitor,
+                        gfx::Rect* monitor_rect,
+                        gfx::Rect* work_area) {
+  DCHECK(monitor);
+  DCHECK(monitor_rect);
+  DCHECK(work_area);
+  *monitor = MonitorFromRect(&rect, MONITOR_DEFAULTTONULL);
+  if (!*monitor)
+    return false;
+  MONITORINFO monitor_info = { 0 };
+  monitor_info.cbSize = sizeof(monitor_info);
+  GetMonitorInfo(*monitor, &monitor_info);
+  *monitor_rect = monitor_info.rcMonitor;
+  *work_area = monitor_info.rcWork;
+  return true;
+}
+
+// Links the HWND to its NativeWidget.
+const char* const kNativeWidgetKey = "__VIEWS_NATIVE_WIDGET__";
+
+// A custom MSAA object id used to determine if a screen reader is actively
+// listening for MSAA events.
+const int kCustomObjectID = 1;
+
+const int kDragFrameWindowAlpha = 200;
+
+}  // namespace
+
+// static
+bool NativeWidgetWin::screen_reader_active_ = false;
+
+// A scoping class that prevents a window from being able to redraw in response
+// to invalidations that may occur within it for the lifetime of the object.
+//
+// Why would we want such a thing? Well, it turns out Windows has some
+// "unorthodox" behavior when it comes to painting its non-client areas.
+// Occasionally, Windows will paint portions of the default non-client area
+// right over the top of the custom frame. This is not simply fixed by handling
+// WM_NCPAINT/WM_PAINT, with some investigation it turns out that this
+// rendering is being done *inside* the default implementation of some message
+// handlers and functions:
+//  . WM_SETTEXT
+//  . WM_SETICON
+//  . WM_NCLBUTTONDOWN
+//  . EnableMenuItem, called from our WM_INITMENU handler
+// The solution is to handle these messages and call DefWindowProc ourselves,
+// but prevent the window from being able to update itself for the duration of
+// the call. We do this with this class, which automatically calls its
+// associated Window's lock and unlock functions as it is created and destroyed.
+// See documentation in those methods for the technique used.
+//
+// The lock only has an effect if the window was visible upon lock creation, as
+// it doesn't guard against direct visiblility changes, and multiple locks may
+// exist simultaneously to handle certain nested Windows messages.
+//
+// IMPORTANT: Do not use this scoping object for large scopes or periods of
+//            time! IT WILL PREVENT THE WINDOW FROM BEING REDRAWN! (duh).
+//
+// I would love to hear Raymond Chen's explanation for all this. And maybe a
+// list of other messages that this applies to ;-)
+class NativeWidgetWin::ScopedRedrawLock {
+ public:
+  explicit ScopedRedrawLock(NativeWidgetWin* widget)
+    : widget_(widget),
+      native_view_(widget_->GetNativeView()),
+      was_visible_(widget_->IsVisible()),
+      cancel_unlock_(false) {
+    if (was_visible_ && ::IsWindow(native_view_))
+      widget_->LockUpdates();
+  }
+
+  ~ScopedRedrawLock() {
+    if (!cancel_unlock_ && was_visible_ && ::IsWindow(native_view_))
+      widget_->UnlockUpdates();
+  }
+
+  // Cancel the unlock operation, call this if the Widget is being destroyed.
+  void CancelUnlockOperation() { cancel_unlock_ = true; }
+
+ private:
+  // The widget having its style changed.
+  NativeWidgetWin* widget_;
+  // The widget's native view, cached to avoid action after window destruction.
+  gfx::NativeView native_view_;
+  // Records the widget visibility at the time of creation.
+  bool was_visible_;
+  // A flag indicating that the unlock operation was canceled.
+  bool cancel_unlock_;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, public:
+
+NativeWidgetWin::NativeWidgetWin(internal::NativeWidgetDelegate* delegate)
+    : delegate_(delegate),
+      ALLOW_THIS_IN_INITIALIZER_LIST(close_widget_factory_(this)),
+      active_mouse_tracking_flags_(0),
+      use_layered_buffer_(false),
+      layered_alpha_(255),
+      ALLOW_THIS_IN_INITIALIZER_LIST(paint_layered_window_factory_(this)),
+      ownership_(Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET),
+      can_update_layered_window_(true),
+      restore_focus_when_enabled_(false),
+      accessibility_view_events_index_(-1),
+      accessibility_view_events_(kMaxAccessibilityViewEvents),
+      previous_cursor_(NULL),
+      fullscreen_(false),
+      force_hidden_count_(0),
+      lock_updates_count_(0),
+      saved_window_style_(0),
+      ignore_window_pos_changes_(false),
+      ALLOW_THIS_IN_INITIALIZER_LIST(ignore_pos_changes_factory_(this)),
+      last_monitor_(NULL),
+      is_right_mouse_pressed_on_caption_(false),
+      restored_enabled_(false),
+      destroyed_(NULL),
+      has_non_client_view_(false) {
+}
+
+NativeWidgetWin::~NativeWidgetWin() {
+  if (destroyed_ != NULL)
+    *destroyed_ = true;
+
+  if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET)
+    delete delegate_;
+  else
+    CloseNow();
+}
+
+// static
+bool NativeWidgetWin::IsAeroGlassEnabled() {
+  if (base::win::GetVersion() < base::win::VERSION_VISTA)
+    return false;
+  // If composition is not enabled, we behave like on XP.
+  BOOL enabled = FALSE;
+  return SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled;
+}
+
+// static
+gfx::Font NativeWidgetWin::GetWindowTitleFont() {
+  NONCLIENTMETRICS ncm;
+  base::win::GetNonClientMetrics(&ncm);
+  l10n_util::AdjustUIFont(&(ncm.lfCaptionFont));
+  base::win::ScopedHFONT caption_font(CreateFontIndirect(&(ncm.lfCaptionFont)));
+  return gfx::Font(caption_font);
+}
+
+void NativeWidgetWin::Show(int show_state) {
+  ShowWindow(show_state);
+  // When launched from certain programs like bash and Windows Live Messenger,
+  // show_state is set to SW_HIDE, so we need to correct that condition. We
+  // don't just change show_state to SW_SHOWNORMAL because MSDN says we must
+  // always first call ShowWindow with the specified value from STARTUPINFO,
+  // otherwise all future ShowWindow calls will be ignored (!!#@@#!). Instead,
+  // we call ShowWindow again in this case.
+  if (show_state == SW_HIDE) {
+    show_state = SW_SHOWNORMAL;
+    ShowWindow(show_state);
+  }
+
+  // We need to explicitly activate the window if we've been shown with a state
+  // that should activate, because if we're opened from a desktop shortcut while
+  // an existing window is already running it doesn't seem to be enough to use
+  // one of these flags to activate the window.
+  if (show_state == SW_SHOWNORMAL || show_state == SW_SHOWMAXIMIZED)
+    Activate();
+
+  SetInitialFocus();
+}
+
+View* NativeWidgetWin::GetAccessibilityViewEventAt(int id) {
+  // Convert from MSAA child id.
+  id = -(id + 1);
+  DCHECK(id >= 0 && id < kMaxAccessibilityViewEvents);
+  return accessibility_view_events_[id];
+}
+
+int NativeWidgetWin::AddAccessibilityViewEvent(View* view) {
+  accessibility_view_events_index_ =
+      (accessibility_view_events_index_ + 1) % kMaxAccessibilityViewEvents;
+  accessibility_view_events_[accessibility_view_events_index_] = view;
+
+  // Convert to MSAA child id.
+  return -(accessibility_view_events_index_ + 1);
+}
+
+void NativeWidgetWin::ClearAccessibilityViewEvent(View* view) {
+  for (std::vector<View*>::iterator it = accessibility_view_events_.begin();
+      it != accessibility_view_events_.end();
+      ++it) {
+    if (*it == view)
+      *it = NULL;
+  }
+}
+
+void NativeWidgetWin::PushForceHidden() {
+  if (force_hidden_count_++ == 0)
+    Hide();
+}
+
+void NativeWidgetWin::PopForceHidden() {
+  if (--force_hidden_count_ <= 0) {
+    force_hidden_count_ = 0;
+    ShowWindow(SW_SHOW);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, CompositorDelegate implementation:
+
+void NativeWidgetWin::ScheduleDraw() {
+  RECT rect;
+  ::GetClientRect(GetNativeView(), &rect);
+  InvalidateRect(GetNativeView(), &rect, FALSE);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, NativeWidget implementation:
+
+void NativeWidgetWin::InitNativeWidget(const Widget::InitParams& params) {
+  SetInitParams(params);
+
+  GetMonitorAndRects(params.bounds.ToRECT(), &last_monitor_,
+                     &last_monitor_rect_, &last_work_area_);
+
+  // Create the window.
+  WindowImpl::Init(params.GetParent(), params.bounds);
+}
+
+NonClientFrameView* NativeWidgetWin::CreateNonClientFrameView() {
+  return GetWidget()->ShouldUseNativeFrame() ?
+      new NativeFrameView(GetWidget()) : NULL;
+}
+
+void NativeWidgetWin::UpdateFrameAfterFrameChange() {
+  // We've either gained or lost a custom window region, so reset it now.
+  ResetWindowRegion(true);
+}
+
+bool NativeWidgetWin::ShouldUseNativeFrame() const {
+  return IsAeroGlassEnabled();
+}
+
+void NativeWidgetWin::FrameTypeChanged() {
+  // Called when the frame type could possibly be changing (theme change or
+  // DWM composition change).
+  if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
+    // We need to toggle the rendering policy of the DWM/glass frame as we
+    // change from opaque to glass. "Non client rendering enabled" means that
+    // the DWM's glass non-client rendering is enabled, which is why
+    // DWMNCRP_ENABLED is used for the native frame case. _DISABLED means the
+    // DWM doesn't render glass, and so is used in the custom frame case.
+    DWMNCRENDERINGPOLICY policy = GetWidget()->ShouldUseNativeFrame() ?
+        DWMNCRP_ENABLED : DWMNCRP_DISABLED;
+    DwmSetWindowAttribute(GetNativeView(), DWMWA_NCRENDERING_POLICY,
+                          &policy, sizeof(DWMNCRENDERINGPOLICY));
+  }
+
+  // Send a frame change notification, since the non-client metrics have
+  // changed.
+  SendFrameChanged(GetNativeView());
+
+  // Update the non-client view with the correct frame view for the active frame
+  // type.
+  GetWidget()->non_client_view()->UpdateFrame();
+
+  // WM_DWMCOMPOSITIONCHANGED is only sent to top level windows, however we want
+  // to notify our children too, since we can have MDI child windows who need to
+  // update their appearance.
+  EnumChildWindows(GetNativeView(), &SendDwmCompositionChanged, NULL);
+}
+
+Widget* NativeWidgetWin::GetWidget() {
+  return delegate_->AsWidget();
+}
+
+const Widget* NativeWidgetWin::GetWidget() const {
+  return delegate_->AsWidget();
+}
+
+gfx::NativeView NativeWidgetWin::GetNativeView() const {
+  return WindowImpl::hwnd();
+}
+
+gfx::NativeWindow NativeWidgetWin::GetNativeWindow() const {
+  return WindowImpl::hwnd();
+}
+
+Widget* NativeWidgetWin::GetTopLevelWidget() {
+  NativeWidgetPrivate* native_widget = GetTopLevelNativeWidget(GetNativeView());
+  return native_widget ? native_widget->GetWidget() : NULL;
+}
+
+const ui::Compositor* NativeWidgetWin::GetCompositor() const {
+  return compositor_.get();
+}
+
+ui::Compositor* NativeWidgetWin::GetCompositor() {
+  return compositor_.get();
+}
+
+void NativeWidgetWin::CalculateOffsetToAncestorWithLayer(
+    gfx::Point* offset,
+    ui::Layer** layer_parent) {
+}
+
+void NativeWidgetWin::ReorderLayers() {
+}
+
+void NativeWidgetWin::ViewRemoved(View* view) {
+  if (drop_target_.get())
+    drop_target_->ResetTargetViewIfEquals(view);
+
+  ClearAccessibilityViewEvent(view);
+}
+
+void NativeWidgetWin::SetNativeWindowProperty(const char* name, void* value) {
+  // Remove the existing property (if any).
+  for (ViewProps::iterator i = props_.begin(); i != props_.end(); ++i) {
+    if ((*i)->Key() == name) {
+      props_.erase(i);
+      break;
+    }
+  }
+
+  if (value)
+    props_.push_back(new ViewProp(hwnd(), name, value));
+}
+
+void* NativeWidgetWin::GetNativeWindowProperty(const char* name) const {
+  return ViewProp::GetValue(hwnd(), name);
+}
+
+TooltipManager* NativeWidgetWin::GetTooltipManager() const {
+  return tooltip_manager_.get();
+}
+
+bool NativeWidgetWin::IsScreenReaderActive() const {
+  return screen_reader_active_;
+}
+
+void NativeWidgetWin::SendNativeAccessibilityEvent(
+    View* view,
+    ui::AccessibilityTypes::Event event_type) {
+  // Now call the Windows-specific method to notify MSAA clients of this
+  // event.  The widget gives us a temporary unique child ID to associate
+  // with this view so that clients can call get_accChild in
+  // NativeViewAccessibilityWin to retrieve the IAccessible associated
+  // with this view.
+  int child_id = AddAccessibilityViewEvent(view);
+  ::NotifyWinEvent(NativeViewAccessibilityWin::MSAAEvent(event_type),
+                   GetNativeView(), OBJID_CLIENT, child_id);
+}
+
+void NativeWidgetWin::SetMouseCapture() {
+  DCHECK(!HasMouseCapture());
+  SetCapture(hwnd());
+}
+
+void NativeWidgetWin::ReleaseMouseCapture() {
+  ReleaseCapture();
+}
+
+bool NativeWidgetWin::HasMouseCapture() const {
+  return GetCapture() == hwnd();
+}
+
+InputMethod* NativeWidgetWin::CreateInputMethod() {
+  if (views::Widget::IsPureViews()) {
+    InputMethod* input_method = new InputMethodWin(this);
+    input_method->Init(GetWidget());
+    return input_method;
+  }
+  return NULL;
+}
+
+void NativeWidgetWin::CenterWindow(const gfx::Size& size) {
+  HWND parent = GetParent();
+  if (!IsWindow())
+    parent = ::GetWindow(GetNativeView(), GW_OWNER);
+  ui::CenterAndSizeWindow(parent, GetNativeView(), size, false);
+}
+
+void NativeWidgetWin::GetWindowPlacement(
+    gfx::Rect* bounds,
+    ui::WindowShowState* show_state) const {
+  WINDOWPLACEMENT wp;
+  wp.length = sizeof(wp);
+  const bool succeeded = !!::GetWindowPlacement(GetNativeView(), &wp);
+  DCHECK(succeeded);
+
+  if (bounds != NULL) {
+    MONITORINFO mi;
+    mi.cbSize = sizeof(mi);
+    const bool succeeded = !!GetMonitorInfo(
+        MonitorFromWindow(GetNativeView(), MONITOR_DEFAULTTONEAREST), &mi);
+    DCHECK(succeeded);
+    *bounds = gfx::Rect(wp.rcNormalPosition);
+    // Convert normal position from workarea coordinates to screen coordinates.
+    bounds->Offset(mi.rcWork.left - mi.rcMonitor.left,
+                   mi.rcWork.top - mi.rcMonitor.top);
+  }
+
+  if (show_state != NULL) {
+    if (wp.showCmd == SW_SHOWMAXIMIZED)
+      *show_state = ui::SHOW_STATE_MAXIMIZED;
+    else if (wp.showCmd == SW_SHOWMINIMIZED)
+      *show_state = ui::SHOW_STATE_MINIMIZED;
+    else
+      *show_state = ui::SHOW_STATE_NORMAL;
+  }
+}
+
+void NativeWidgetWin::SetWindowTitle(const string16& title) {
+  SetWindowText(GetNativeView(), title.c_str());
+  SetAccessibleName(title);
+}
+
+void NativeWidgetWin::SetWindowIcons(const SkBitmap& window_icon,
+                                     const SkBitmap& app_icon) {
+  if (!window_icon.isNull()) {
+    HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(window_icon);
+    // We need to make sure to destroy the previous icon, otherwise we'll leak
+    // these GDI objects until we crash!
+    HICON old_icon = reinterpret_cast<HICON>(
+        SendMessage(GetNativeView(), WM_SETICON, ICON_SMALL,
+                    reinterpret_cast<LPARAM>(windows_icon)));
+    if (old_icon)
+      DestroyIcon(old_icon);
+  }
+  if (!app_icon.isNull()) {
+    HICON windows_icon = IconUtil::CreateHICONFromSkBitmap(app_icon);
+    HICON old_icon = reinterpret_cast<HICON>(
+        SendMessage(GetNativeView(), WM_SETICON, ICON_BIG,
+                    reinterpret_cast<LPARAM>(windows_icon)));
+    if (old_icon)
+      DestroyIcon(old_icon);
+  }
+}
+
+void NativeWidgetWin::SetAccessibleName(const string16& name) {
+  base::win::ScopedComPtr<IAccPropServices> pAccPropServices;
+  HRESULT hr = CoCreateInstance(CLSID_AccPropServices, NULL, CLSCTX_SERVER,
+      IID_IAccPropServices, reinterpret_cast<void**>(&pAccPropServices));
+  if (SUCCEEDED(hr))
+    hr = pAccPropServices->SetHwndPropStr(GetNativeView(), OBJID_CLIENT,
+                                          CHILDID_SELF, PROPID_ACC_NAME,
+                                          name.c_str());
+}
+
+void NativeWidgetWin::SetAccessibleRole(ui::AccessibilityTypes::Role role) {
+  base::win::ScopedComPtr<IAccPropServices> pAccPropServices;
+  HRESULT hr = CoCreateInstance(CLSID_AccPropServices, NULL, CLSCTX_SERVER,
+      IID_IAccPropServices, reinterpret_cast<void**>(&pAccPropServices));
+  if (SUCCEEDED(hr)) {
+    VARIANT var;
+    if (role) {
+      var.vt = VT_I4;
+      var.lVal = NativeViewAccessibilityWin::MSAARole(role);
+      hr = pAccPropServices->SetHwndProp(GetNativeView(), OBJID_CLIENT,
+                                         CHILDID_SELF, PROPID_ACC_ROLE, var);
+    }
+  }
+}
+
+void NativeWidgetWin::SetAccessibleState(ui::AccessibilityTypes::State state) {
+  base::win::ScopedComPtr<IAccPropServices> pAccPropServices;
+  HRESULT hr = CoCreateInstance(CLSID_AccPropServices, NULL, CLSCTX_SERVER,
+      IID_IAccPropServices, reinterpret_cast<void**>(&pAccPropServices));
+  if (SUCCEEDED(hr)) {
+    VARIANT var;
+    if (state) {
+      var.vt = VT_I4;
+      var.lVal = NativeViewAccessibilityWin::MSAAState(state);
+      hr = pAccPropServices->SetHwndProp(GetNativeView(), OBJID_CLIENT,
+                                         CHILDID_SELF, PROPID_ACC_STATE, var);
+    }
+  }
+}
+
+void NativeWidgetWin::BecomeModal() {
+  // We implement modality by crawling up the hierarchy of windows starting
+  // at the owner, disabling all of them so that they don't receive input
+  // messages.
+  HWND start = ::GetWindow(GetNativeView(), GW_OWNER);
+  while (start) {
+    ::EnableWindow(start, FALSE);
+    start = ::GetParent(start);
+  }
+}
+
+gfx::Rect NativeWidgetWin::GetWindowScreenBounds() const {
+  RECT r;
+  GetWindowRect(&r);
+  return gfx::Rect(r);
+}
+
+gfx::Rect NativeWidgetWin::GetClientAreaScreenBounds() const {
+  RECT r;
+  GetClientRect(&r);
+  POINT point = { r.left, r.top };
+  ClientToScreen(hwnd(), &point);
+  return gfx::Rect(point.x, point.y, r.right - r.left, r.bottom - r.top);
+}
+
+gfx::Rect NativeWidgetWin::GetRestoredBounds() const {
+  // If we're in fullscreen mode, we've changed the normal bounds to the monitor
+  // rect, so return the saved bounds instead.
+  if (IsFullscreen())
+    return gfx::Rect(saved_window_info_.window_rect);
+
+  gfx::Rect bounds;
+  GetWindowPlacement(&bounds, NULL);
+  return bounds;
+}
+
+void NativeWidgetWin::SetBounds(const gfx::Rect& bounds) {
+  LONG style = GetWindowLong(GWL_STYLE);
+  if (style & WS_MAXIMIZE)
+    SetWindowLong(GWL_STYLE, style & ~WS_MAXIMIZE);
+  SetWindowPos(NULL, bounds.x(), bounds.y(), bounds.width(), bounds.height(),
+               SWP_NOACTIVATE | SWP_NOZORDER);
+}
+
+void NativeWidgetWin::SetSize(const gfx::Size& size) {
+  SetWindowPos(NULL, 0, 0, size.width(), size.height(),
+               SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOMOVE);
+}
+
+void NativeWidgetWin::MoveAbove(gfx::NativeView native_view) {
+  SetWindowPos(native_view, 0, 0, 0, 0,
+               SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
+}
+
+void NativeWidgetWin::MoveToTop() {
+  NOTIMPLEMENTED();
+}
+
+void NativeWidgetWin::SetShape(gfx::NativeRegion region) {
+  SetWindowRgn(region, TRUE);
+}
+
+void NativeWidgetWin::Close() {
+  if (!IsWindow())
+    return;  // No need to do anything.
+
+  // Let's hide ourselves right away.
+  Hide();
+
+  // Modal dialog windows disable their owner windows; re-enable them now so
+  // they can activate as foreground windows upon this window's destruction.
+  RestoreEnabledIfNecessary();
+
+  if (!close_widget_factory_.HasWeakPtrs()) {
+    // And we delay the close so that if we are called from an ATL callback,
+    // we don't destroy the window before the callback returned (as the caller
+    // may delete ourselves on destroy and the ATL callback would still
+    // dereference us when the callback returns).
+    MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&NativeWidgetWin::CloseNow,
+                   close_widget_factory_.GetWeakPtr()));
+  }
+}
+
+void NativeWidgetWin::CloseNow() {
+  // We may already have been destroyed if the selection resulted in a tab
+  // switch which will have reactivated the browser window and closed us, so
+  // we need to check to see if we're still a window before trying to destroy
+  // ourself.
+  if (IsWindow())
+    DestroyWindow(hwnd());
+}
+
+void NativeWidgetWin::EnableClose(bool enable) {
+  // Disable the native frame's close button regardless of whether or not the
+  // native frame is in use, since this also affects the system menu.
+  EnableMenuItem(GetSystemMenu(GetNativeView(), false), SC_CLOSE, enable);
+  SendFrameChanged(GetNativeView());
+}
+
+void NativeWidgetWin::Show() {
+  if (!IsWindow())
+    return;
+
+  ShowWindow(SW_SHOWNOACTIVATE);
+  SetInitialFocus();
+}
+
+void NativeWidgetWin::Hide() {
+  if (IsWindow()) {
+    // NOTE: Be careful not to activate any windows here (for example, calling
+    // ShowWindow(SW_HIDE) will automatically activate another window).  This
+    // code can be called while a window is being deactivated, and activating
+    // another window will screw up the activation that is already in progress.
+    SetWindowPos(NULL, 0, 0, 0, 0,
+                 SWP_HIDEWINDOW | SWP_NOACTIVATE | SWP_NOMOVE |
+                 SWP_NOREPOSITION | SWP_NOSIZE | SWP_NOZORDER);
+  }
+}
+
+void NativeWidgetWin::ShowMaximizedWithBounds(
+    const gfx::Rect& restored_bounds) {
+  WINDOWPLACEMENT placement = { 0 };
+  placement.length = sizeof(WINDOWPLACEMENT);
+  placement.showCmd = SW_SHOWMAXIMIZED;
+  placement.rcNormalPosition = restored_bounds.ToRECT();
+  SetWindowPlacement(hwnd(), &placement);
+}
+
+void NativeWidgetWin::ShowWithWindowState(ui::WindowShowState show_state) {
+  DWORD native_show_state;
+  switch (show_state) {
+    case ui::SHOW_STATE_INACTIVE:
+      native_show_state = SW_SHOWNOACTIVATE;
+      break;
+    case ui::SHOW_STATE_MAXIMIZED:
+      native_show_state = SW_SHOWMAXIMIZED;
+      break;
+    case ui::SHOW_STATE_MINIMIZED:
+      native_show_state = SW_SHOWMINIMIZED;
+      break;
+    default:
+      native_show_state = GetShowState();
+      break;
+  }
+  Show(native_show_state);
+}
+
+bool NativeWidgetWin::IsVisible() const {
+  return !!::IsWindowVisible(hwnd());
+}
+
+void NativeWidgetWin::Activate() {
+  if (IsMinimized())
+    ::ShowWindow(GetNativeView(), SW_RESTORE);
+  ::SetWindowPos(GetNativeView(), HWND_TOP, 0, 0, 0, 0,
+                 SWP_NOSIZE | SWP_NOMOVE);
+  SetForegroundWindow(GetNativeView());
+}
+
+void NativeWidgetWin::Deactivate() {
+  HWND hwnd = ::GetNextWindow(GetNativeView(), GW_HWNDNEXT);
+  if (hwnd)
+    ::SetForegroundWindow(hwnd);
+}
+
+bool NativeWidgetWin::IsActive() const {
+  return GetActiveWindow() == hwnd();
+}
+
+void NativeWidgetWin::SetAlwaysOnTop(bool on_top) {
+  ::SetWindowPos(GetNativeView(), on_top ? HWND_TOPMOST : HWND_NOTOPMOST,
+                 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
+}
+
+void NativeWidgetWin::Maximize() {
+  ExecuteSystemMenuCommand(SC_MAXIMIZE);
+}
+
+void NativeWidgetWin::Minimize() {
+  ExecuteSystemMenuCommand(SC_MINIMIZE);
+
+  delegate_->OnNativeBlur(NULL);
+}
+
+bool NativeWidgetWin::IsMaximized() const {
+  return !!::IsZoomed(GetNativeView());
+}
+
+bool NativeWidgetWin::IsMinimized() const {
+  return !!::IsIconic(GetNativeView());
+}
+
+void NativeWidgetWin::Restore() {
+  ExecuteSystemMenuCommand(SC_RESTORE);
+}
+
+void NativeWidgetWin::SetFullscreen(bool fullscreen) {
+  if (fullscreen_ == fullscreen)
+    return;  // Nothing to do.
+
+  // Reduce jankiness during the following position changes by hiding the window
+  // until it's in the final position.
+  PushForceHidden();
+
+  // Size/position/style window appropriately.
+  if (!fullscreen_) {
+    // Save current window information.  We force the window into restored mode
+    // before going fullscreen because Windows doesn't seem to hide the
+    // taskbar if the window is in the maximized state.
+    saved_window_info_.maximized = IsMaximized();
+    if (saved_window_info_.maximized)
+      Restore();
+    saved_window_info_.style = GetWindowLong(GWL_STYLE);
+    saved_window_info_.ex_style = GetWindowLong(GWL_EXSTYLE);
+    GetWindowRect(&saved_window_info_.window_rect);
+  }
+
+  fullscreen_ = fullscreen;
+
+  if (fullscreen_) {
+    // Set new window style and size.
+    MONITORINFO monitor_info;
+    monitor_info.cbSize = sizeof(monitor_info);
+    GetMonitorInfo(MonitorFromWindow(GetNativeView(), MONITOR_DEFAULTTONEAREST),
+                   &monitor_info);
+    gfx::Rect monitor_rect(monitor_info.rcMonitor);
+    SetWindowLong(GWL_STYLE,
+                  saved_window_info_.style & ~(WS_CAPTION | WS_THICKFRAME));
+    SetWindowLong(GWL_EXSTYLE,
+                  saved_window_info_.ex_style & ~(WS_EX_DLGMODALFRAME |
+                  WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE));
+    SetWindowPos(NULL, monitor_rect.x(), monitor_rect.y(),
+                 monitor_rect.width(), monitor_rect.height(),
+                 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
+  } else {
+    // Reset original window style and size.  The multiple window size/moves
+    // here are ugly, but if SetWindowPos() doesn't redraw, the taskbar won't be
+    // repainted.  Better-looking methods welcome.
+    gfx::Rect new_rect(saved_window_info_.window_rect);
+    SetWindowLong(GWL_STYLE, saved_window_info_.style);
+    SetWindowLong(GWL_EXSTYLE, saved_window_info_.ex_style);
+    SetWindowPos(NULL, new_rect.x(), new_rect.y(), new_rect.width(),
+                 new_rect.height(),
+                 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
+    if (saved_window_info_.maximized)
+      Maximize();
+  }
+
+  // Undo our anti-jankiness hacks.
+  PopForceHidden();
+}
+
+bool NativeWidgetWin::IsFullscreen() const {
+  return fullscreen_;
+}
+
+void NativeWidgetWin::SetOpacity(unsigned char opacity) {
+  layered_alpha_ = static_cast<BYTE>(opacity);
+}
+
+void NativeWidgetWin::SetUseDragFrame(bool use_drag_frame) {
+  if (use_drag_frame) {
+    // Make the frame slightly transparent during the drag operation.
+    drag_frame_saved_window_style_ = GetWindowLong(GWL_STYLE);
+    drag_frame_saved_window_ex_style_ = GetWindowLong(GWL_EXSTYLE);
+    SetWindowLong(GWL_EXSTYLE,
+                  drag_frame_saved_window_ex_style_ | WS_EX_LAYERED);
+    // Remove the captions tyle so the window doesn't have window controls for a
+    // more "transparent" look.
+    SetWindowLong(GWL_STYLE, drag_frame_saved_window_style_ & ~WS_CAPTION);
+    SetLayeredWindowAttributes(GetNativeWindow(), RGB(0xFF, 0xFF, 0xFF),
+                               kDragFrameWindowAlpha, LWA_ALPHA);
+  } else {
+    SetWindowLong(GWL_STYLE, drag_frame_saved_window_style_);
+    SetWindowLong(GWL_EXSTYLE, drag_frame_saved_window_ex_style_);
+  }
+}
+
+bool NativeWidgetWin::IsAccessibleWidget() const {
+  return screen_reader_active_;
+}
+
+void NativeWidgetWin::RunShellDrag(View* view,
+                                   const ui::OSExchangeData& data,
+                                   int operation) {
+  scoped_refptr<ui::DragSource> drag_source(new ui::DragSource);
+  DWORD effects;
+  DoDragDrop(ui::OSExchangeDataProviderWin::GetIDataObject(data), drag_source,
+             ui::DragDropTypes::DragOperationToDropEffect(operation), &effects);
+}
+
+void NativeWidgetWin::SchedulePaintInRect(const gfx::Rect& rect) {
+  if (use_layered_buffer_) {
+    // We must update the back-buffer immediately, since Windows' handling of
+    // invalid rects is somewhat mysterious.
+    invalid_rect_ = invalid_rect_.Union(rect);
+
+    // In some situations, such as drag and drop, when Windows itself runs a
+    // nested message loop our message loop appears to be starved and we don't
+    // receive calls to DidProcessMessage(). This only seems to affect layered
+    // windows, so we schedule a redraw manually using a task, since those never
+    // seem to be starved. Also, wtf.
+    if (!paint_layered_window_factory_.HasWeakPtrs()) {
+      MessageLoop::current()->PostTask(
+          FROM_HERE,
+          base::Bind(&NativeWidgetWin::RedrawLayeredWindowContents,
+                     paint_layered_window_factory_.GetWeakPtr()));
+    }
+  } else {
+    // InvalidateRect() expects client coordinates.
+    RECT r = rect.ToRECT();
+    InvalidateRect(hwnd(), &r, FALSE);
+  }
+}
+
+void NativeWidgetWin::SetCursor(gfx::NativeCursor cursor) {
+  if (cursor) {
+    previous_cursor_ = ::SetCursor(cursor);
+  } else if (previous_cursor_) {
+    ::SetCursor(previous_cursor_);
+    previous_cursor_ = NULL;
+  }
+}
+
+void NativeWidgetWin::ClearNativeFocus() {
+  ::SetFocus(GetNativeView());
+}
+
+void NativeWidgetWin::FocusNativeView(gfx::NativeView native_view) {
+  // Only reset focus if hwnd is not already focused.
+  if (native_view && ::GetFocus() != native_view)
+    ::SetFocus(native_view);
+}
+
+bool NativeWidgetWin::ConvertPointFromAncestor(
+    const Widget* ancestor, gfx::Point* point) const {
+  NOTREACHED();
+  return false;
+}
+
+gfx::Rect NativeWidgetWin::GetWorkAreaBoundsInScreen() const {
+  return gfx::Screen::GetMonitorWorkAreaNearestWindow(GetNativeView());
+}
+
+void NativeWidgetWin::SetInactiveRenderingDisabled(bool value) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, MessageLoop::Observer implementation:
+
+base::EventStatus NativeWidgetWin::WillProcessEvent(
+    const base::NativeEvent& event) {
+  return base::EVENT_CONTINUE;
+}
+
+void NativeWidgetWin::DidProcessEvent(const base::NativeEvent& event) {
+  RedrawInvalidRect();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, WindowImpl overrides:
+
+HICON NativeWidgetWin::GetDefaultWindowIcon() const {
+  if (ViewsDelegate::views_delegate)
+    return ViewsDelegate::views_delegate->GetDefaultWindowIcon();
+  return NULL;
+}
+
+LRESULT NativeWidgetWin::OnWndProc(UINT message, WPARAM w_param,
+                                   LPARAM l_param) {
+  HWND window = hwnd();
+  LRESULT result = 0;
+
+  // First allow messages sent by child controls to be processed directly by
+  // their associated views. If such a view is present, it will handle the
+  // message *instead of* this NativeWidgetWin.
+  if (ProcessChildWindowMessage(message, w_param, l_param, &result))
+    return result;
+
+  // Otherwise we handle everything else.
+  if (!ProcessWindowMessage(window, message, w_param, l_param, result))
+    result = DefWindowProc(window, message, w_param, l_param);
+  if (message == WM_NCDESTROY) {
+    MessageLoopForUI::current()->RemoveObserver(this);
+    OnFinalMessage(window);
+  }
+
+  // Only top level widget should store/restore focus.
+  if (message == WM_ACTIVATE && GetWidget()->is_top_level())
+    PostProcessActivateMessage(this, LOWORD(w_param));
+  if (message == WM_ENABLE && restore_focus_when_enabled_) {
+    // This path should be executed only for top level as
+    // restore_focus_when_enabled_ is set in PostProcessActivateMessage.
+    DCHECK(GetWidget()->is_top_level());
+    restore_focus_when_enabled_ = false;
+    GetWidget()->GetFocusManager()->RestoreFocusedView();
+  }
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, protected:
+
+// Message handlers ------------------------------------------------------------
+
+void NativeWidgetWin::OnActivate(UINT action, BOOL minimized, HWND window) {
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnActivateApp(BOOL active, DWORD thread_id) {
+  if (GetWidget()->non_client_view() && !active &&
+      thread_id != GetCurrentThreadId()) {
+    // Another application was activated, we should reset any state that
+    // disables inactive rendering now.
+    delegate_->EnableInactiveRendering();
+    // Also update the native frame if it is rendering the non-client area.
+    if (GetWidget()->ShouldUseNativeFrame())
+      DefWindowProcWithRedrawLock(WM_NCACTIVATE, FALSE, 0);
+  }
+}
+
+LRESULT NativeWidgetWin::OnAppCommand(HWND window,
+                                      short app_command,
+                                      WORD device,
+                                      int keystate) {
+  // We treat APPCOMMAND ids as an extension of our command namespace, and just
+  // let the delegate figure out what to do...
+  BOOL is_handled = (GetWidget()->widget_delegate() &&
+      GetWidget()->widget_delegate()->ExecuteWindowsCommand(app_command)) ?
+      TRUE : FALSE;
+  SetMsgHandled(is_handled);
+  // Make sure to return TRUE if the event was handled or in some cases the
+  // system will execute the default handler which can cause bugs like going
+  // forward or back two pages instead of one.
+  return is_handled;
+}
+
+void NativeWidgetWin::OnCancelMode() {
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnCaptureChanged(HWND hwnd) {
+  delegate_->OnMouseCaptureLost();
+}
+
+void NativeWidgetWin::OnClose() {
+  GetWidget()->Close();
+}
+
+void NativeWidgetWin::OnCommand(UINT notification_code,
+                                int command_id,
+                                HWND window) {
+  // If the notification code is > 1 it means it is control specific and we
+  // should ignore it.
+  if (notification_code > 1 ||
+      GetWidget()->widget_delegate()->ExecuteWindowsCommand(command_id)) {
+    SetMsgHandled(FALSE);
+  }
+}
+
+LRESULT NativeWidgetWin::OnCreate(CREATESTRUCT* create_struct) {
+  SetNativeWindowProperty(kNativeWidgetKey, this);
+  CHECK_EQ(this, GetNativeWidgetForNativeView(hwnd()));
+
+  use_layered_buffer_ = !!(window_ex_style() & WS_EX_LAYERED);
+
+  // Attempt to detect screen readers by sending an event with our custom id.
+  if (!IsAccessibleWidget())
+    NotifyWinEvent(EVENT_SYSTEM_ALERT, hwnd(), kCustomObjectID, CHILDID_SELF);
+
+  props_.push_back(ui::SetWindowSupportsRerouteMouseWheel(hwnd()));
+
+  drop_target_ = new DropTargetWin(
+      static_cast<internal::RootView*>(GetWidget()->GetRootView()));
+
+  // We need to add ourselves as a message loop observer so that we can repaint
+  // aggressively if the contents of our window become invalid. Unfortunately
+  // WM_PAINT messages are starved and we get flickery redrawing when resizing
+  // if we do not do this.
+  MessageLoopForUI::current()->AddObserver(this);
+
+  // Windows special DWM window frame requires a special tooltip manager so
+  // that window controls in Chrome windows don't flicker when you move your
+  // mouse over them. See comment in aero_tooltip_manager.h.
+  Widget* widget = GetWidget()->GetTopLevelWidget();
+  if (widget && widget->ShouldUseNativeFrame()) {
+    tooltip_manager_.reset(new AeroTooltipManager(GetWidget()));
+  } else {
+    tooltip_manager_.reset(new TooltipManagerWin(GetWidget()));
+  }
+  if (!tooltip_manager_->Init()) {
+    // There was a problem creating the TooltipManager. Common error is 127.
+    // See 82193 for details.
+    LOG_GETLASTERROR(WARNING) << "tooltip creation failed, disabling tooltips";
+    tooltip_manager_.reset();
+  }
+
+  // This message initializes the window so that focus border are shown for
+  // windows.
+  SendMessage(
+      hwnd(), WM_CHANGEUISTATE, MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS), 0);
+
+  // Bug 964884: detach the IME attached to this window.
+  // We should attach IMEs only when we need to input CJK strings.
+  ImmAssociateContextEx(hwnd(), NULL, 0);
+
+  // We need to allow the delegate to size its contents since the window may not
+  // receive a size notification when its initial bounds are specified at window
+  // creation time.
+  ClientAreaSizeChanged();
+
+#if defined(VIEWS_COMPOSITOR)
+  if (View::get_use_acceleration_when_possible()) {
+    if (ui::Compositor::compositor_factory()) {
+      compositor_ = (*Widget::compositor_factory())(this);
+    } else {
+      CRect window_rect;
+      GetClientRect(&window_rect);
+      compositor_ = ui::Compositor::Create(this,
+          hwnd(),
+          gfx::Size(window_rect.Width(), window_rect.Height()));
+    }
+    if (compositor_.get()) {
+      delegate_->AsWidget()->GetRootView()->SetPaintToLayer(true);
+      compositor_->SetRootLayer(delegate_->AsWidget()->GetRootView()->layer());
+    }
+  }
+#endif
+
+  delegate_->OnNativeWidgetCreated();
+
+  // Get access to a modifiable copy of the system menu.
+  GetSystemMenu(hwnd(), false);
+  return 0;
+}
+
+void NativeWidgetWin::OnDestroy() {
+  delegate_->OnNativeWidgetDestroying();
+  if (drop_target_.get()) {
+    RevokeDragDrop(hwnd());
+    drop_target_ = NULL;
+  }
+}
+
+void NativeWidgetWin::OnDisplayChange(UINT bits_per_pixel, CSize screen_size) {
+  GetWidget()->widget_delegate()->OnDisplayChanged();
+}
+
+LRESULT NativeWidgetWin::OnDwmCompositionChanged(UINT msg,
+                                                 WPARAM w_param,
+                                                 LPARAM l_param) {
+  if (!GetWidget()->non_client_view()) {
+    SetMsgHandled(FALSE);
+    return 0;
+  }
+
+  // For some reason, we need to hide the window while we're changing the frame
+  // type only when we're changing it in response to WM_DWMCOMPOSITIONCHANGED.
+  // If we don't, the client area will be filled with black. I'm suspecting
+  // something skia-ey.
+  // Frame type toggling caused by the user (e.g. switching theme) doesn't seem
+  // to have this requirement.
+  FrameTypeChanged();
+  return 0;
+}
+
+void NativeWidgetWin::OnEndSession(BOOL ending, UINT logoff) {
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnEnterSizeMove() {
+  delegate_->OnNativeWidgetBeginUserBoundsChange();
+  SetMsgHandled(FALSE);
+}
+
+LRESULT NativeWidgetWin::OnEraseBkgnd(HDC dc) {
+  // This is needed for magical win32 flicker ju-ju.
+  return 1;
+}
+
+void NativeWidgetWin::OnExitMenuLoop(BOOL is_track_popup_menu) {
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnExitSizeMove() {
+  delegate_->OnNativeWidgetEndUserBoundsChange();
+  SetMsgHandled(FALSE);
+}
+
+LRESULT NativeWidgetWin::OnGetObject(UINT uMsg,
+                                     WPARAM w_param,
+                                     LPARAM l_param) {
+  LRESULT reference_result = static_cast<LRESULT>(0L);
+
+  // Accessibility readers will send an OBJID_CLIENT message
+  if (OBJID_CLIENT == l_param) {
+    // Retrieve MSAA dispatch object for the root view.
+    base::win::ScopedComPtr<IAccessible> root(
+        GetWidget()->GetRootView()->GetNativeViewAccessible());
+
+    // Create a reference that MSAA will marshall to the client.
+    reference_result = LresultFromObject(IID_IAccessible, w_param,
+        static_cast<IAccessible*>(root.Detach()));
+  }
+
+  if (kCustomObjectID == l_param) {
+    // An MSAA client requestes our custom id. Assume that we have detected an
+    // active windows screen reader.
+    OnScreenReaderDetected();
+
+    // Return with failure.
+    return static_cast<LRESULT>(0L);
+  }
+
+  return reference_result;
+}
+
+void NativeWidgetWin::OnGetMinMaxInfo(MINMAXINFO* minmax_info) {
+  gfx::Size min_window_size(delegate_->GetMinimumSize());
+  // Add the native frame border size to the minimum size if the view reports
+  // its size as the client size.
+  if (WidgetSizeIsClientSize()) {
+    CRect client_rect, window_rect;
+    GetClientRect(&client_rect);
+    GetWindowRect(&window_rect);
+    window_rect -= client_rect;
+    min_window_size.Enlarge(window_rect.Width(), window_rect.Height());
+  }
+  minmax_info->ptMinTrackSize.x = min_window_size.width();
+  minmax_info->ptMinTrackSize.y = min_window_size.height();
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnHScroll(int scroll_type,
+                                short position,
+                                HWND scrollbar) {
+  SetMsgHandled(FALSE);
+}
+
+LRESULT NativeWidgetWin::OnImeMessages(UINT message,
+                                       WPARAM w_param,
+                                       LPARAM l_param) {
+  InputMethod* input_method = GetWidget()->GetInputMethodDirect();
+  if (!input_method || input_method->IsMock()) {
+    SetMsgHandled(FALSE);
+    return 0;
+  }
+
+  InputMethodWin* ime_win = static_cast<InputMethodWin*>(input_method);
+  BOOL handled = FALSE;
+  LRESULT result = ime_win->OnImeMessages(message, w_param, l_param, &handled);
+
+  SetMsgHandled(handled);
+  return result;
+}
+
+void NativeWidgetWin::OnInitMenu(HMENU menu) {
+  bool is_fullscreen = IsFullscreen();
+  bool is_minimized = IsMinimized();
+  bool is_maximized = IsMaximized();
+  bool is_restored = !is_fullscreen && !is_minimized && !is_maximized;
+
+  ScopedRedrawLock lock(this);
+  EnableMenuItem(menu, SC_RESTORE, is_minimized || is_maximized);
+  EnableMenuItem(menu, SC_MOVE, is_restored);
+  EnableMenuItem(menu, SC_SIZE,
+                 GetWidget()->widget_delegate()->CanResize() && is_restored);
+  EnableMenuItem(menu, SC_MAXIMIZE,
+                 GetWidget()->widget_delegate()->CanMaximize() &&
+                     !is_fullscreen && !is_maximized);
+  EnableMenuItem(menu, SC_MINIMIZE,
+                 GetWidget()->widget_delegate()->CanMaximize() &&
+                     !is_minimized);
+}
+
+void NativeWidgetWin::OnInitMenuPopup(HMENU menu,
+                                      UINT position,
+                                      BOOL is_system_menu) {
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnInputLangChange(DWORD character_set,
+                                        HKL input_language_id) {
+  InputMethod* input_method = GetWidget()->GetInputMethodDirect();
+
+  if (input_method && !input_method->IsMock()) {
+    static_cast<InputMethodWin*>(input_method)->OnInputLangChange(
+        character_set, input_language_id);
+  }
+}
+
+LRESULT NativeWidgetWin::OnKeyEvent(UINT message,
+                                    WPARAM w_param,
+                                    LPARAM l_param) {
+  MSG msg = { hwnd(), message, w_param, l_param };
+  KeyEvent key(msg);
+  InputMethod* input_method = GetWidget()->GetInputMethodDirect();
+  if (input_method)
+    input_method->DispatchKeyEvent(key);
+  else
+    DispatchKeyEventPostIME(key);
+  return 0;
+}
+
+void NativeWidgetWin::OnKillFocus(HWND focused_window) {
+  delegate_->OnNativeBlur(focused_window);
+  InputMethod* input_method = GetWidget()->GetInputMethodDirect();
+  if (input_method)
+    input_method->OnBlur();
+  SetMsgHandled(FALSE);
+}
+
+LRESULT NativeWidgetWin::OnMouseActivate(UINT message,
+                                         WPARAM w_param,
+                                         LPARAM l_param) {
+  // TODO(beng): resolve this with the GetWindowLong() check on the subsequent
+  //             line.
+  if (GetWidget()->non_client_view())
+    return delegate_->CanActivate() ? MA_ACTIVATE : MA_NOACTIVATEANDEAT;
+  if (GetWindowLong(GWL_EXSTYLE) & WS_EX_NOACTIVATE)
+    return MA_NOACTIVATE;
+  SetMsgHandled(FALSE);
+  return MA_ACTIVATE;
+}
+
+LRESULT NativeWidgetWin::OnMouseRange(UINT message,
+                                      WPARAM w_param,
+                                      LPARAM l_param) {
+  if (message == WM_RBUTTONUP && is_right_mouse_pressed_on_caption_) {
+    is_right_mouse_pressed_on_caption_ = false;
+    ReleaseCapture();
+    // |point| is in window coordinates, but WM_NCHITTEST and TrackPopupMenu()
+    // expect screen coordinates.
+    CPoint screen_point(l_param);
+    MapWindowPoints(GetNativeView(), HWND_DESKTOP, &screen_point, 1);
+    w_param = SendMessage(GetNativeView(), WM_NCHITTEST, 0,
+                          MAKELPARAM(screen_point.x, screen_point.y));
+    if (w_param == HTCAPTION || w_param == HTSYSMENU) {
+      ui::ShowSystemMenu(GetNativeView(), screen_point.x, screen_point.y);
+      return 0;
+    }
+  } else if (message == WM_NCLBUTTONDOWN &&
+             !GetWidget()->ShouldUseNativeFrame()) {
+    switch (w_param) {
+      case HTCLOSE:
+      case HTMINBUTTON:
+      case HTMAXBUTTON: {
+        // When the mouse is pressed down in these specific non-client areas,
+        // we need to tell the RootView to send the mouse pressed event (which
+        // sets capture, allowing subsequent WM_LBUTTONUP (note, _not_
+        // WM_NCLBUTTONUP) to fire so that the appropriate WM_SYSCOMMAND can be
+        // sent by the applicable button's ButtonListener. We _have_ to do this
+        // way rather than letting Windows just send the syscommand itself (as
+        // would happen if we never did this dance) because for some insane
+        // reason DefWindowProc for WM_NCLBUTTONDOWN also renders the pressed
+        // window control button appearance, in the Windows classic style, over
+        // our view! Ick! By handling this message we prevent Windows from
+        // doing this undesirable thing, but that means we need to roll the
+        // sys-command handling ourselves.
+        // Combine |w_param| with common key state message flags.
+        w_param |= ((GetKeyState(VK_CONTROL) & 0x80) == 0x80)? MK_CONTROL : 0;
+        w_param |= ((GetKeyState(VK_SHIFT) & 0x80) == 0x80)? MK_SHIFT : 0;
+      }
+    }
+  } else if (message == WM_NCRBUTTONDOWN &&
+      (w_param == HTCAPTION || w_param == HTSYSMENU)) {
+    is_right_mouse_pressed_on_caption_ = true;
+    // We SetMouseCapture() to ensure we only show the menu when the button
+    // down and up are both on the caption. Note: this causes the button up to
+    // be WM_RBUTTONUP instead of WM_NCRBUTTONUP.
+    SetMouseCapture();
+  }
+
+  MSG msg = { hwnd(), message, w_param, l_param, 0,
+              { GET_X_LPARAM(l_param), GET_Y_LPARAM(l_param) } };
+  MouseEvent event(msg);
+
+  if (!(event.flags() & ui::EF_IS_NON_CLIENT))
+    if (tooltip_manager_.get())
+      tooltip_manager_->OnMouse(message, w_param, l_param);
+
+  if (event.type() == ui::ET_MOUSE_MOVED && !HasMouseCapture()) {
+    // Windows only fires WM_MOUSELEAVE events if the application begins
+    // "tracking" mouse events for a given HWND during WM_MOUSEMOVE events.
+    // We need to call |TrackMouseEvents| to listen for WM_MOUSELEAVE.
+    TrackMouseEvents((message == WM_NCMOUSEMOVE) ?
+        TME_NONCLIENT | TME_LEAVE : TME_LEAVE);
+  } else if (event.type() == ui::ET_MOUSE_EXITED) {
+    // Reset our tracking flags so future mouse movement over this
+    // NativeWidgetWin results in a new tracking session. Fall through for
+    // OnMouseEvent.
+    active_mouse_tracking_flags_ = 0;
+  } else if (event.type() == ui::ET_MOUSEWHEEL) {
+    // Reroute the mouse wheel to the window under the pointer if applicable.
+    return (ui::RerouteMouseWheel(hwnd(), w_param, l_param) ||
+            delegate_->OnMouseEvent(MouseWheelEvent(msg))) ? 0 : 1;
+  }
+
+  bool handled = delegate_->OnMouseEvent(event);
+
+  if (!handled && message == WM_NCLBUTTONDOWN && w_param != HTSYSMENU &&
+      !GetWidget()->ShouldUseNativeFrame()) {
+    // TODO(msw): Eliminate undesired painting, or re-evaluate this workaround.
+    // DefWindowProc for WM_NCLBUTTONDOWN does weird non-client painting, so we
+    // need to call it inside a ScopedRedrawLock. This may cause other negative
+    // side-effects (ex/ stifling non-client mouse releases).
+    DefWindowProcWithRedrawLock(message, w_param, l_param);
+    handled = true;
+  }
+
+  SetMsgHandled(handled);
+  return 0;
+}
+
+void NativeWidgetWin::OnMove(const CPoint& point) {
+  // TODO(beng): move to Widget.
+  GetWidget()->widget_delegate()->OnWidgetMove();
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnMoving(UINT param, const LPRECT new_bounds) {
+  // TODO(beng): move to Widget.
+  GetWidget()->widget_delegate()->OnWidgetMove();
+}
+
+LRESULT NativeWidgetWin::OnNCActivate(BOOL active) {
+  if (delegate_->CanActivate())
+    delegate_->OnNativeWidgetActivationChanged(!!active);
+
+  if (!GetWidget()->non_client_view()) {
+    SetMsgHandled(FALSE);
+    return 0;
+  }
+
+  if (!delegate_->CanActivate())
+    return TRUE;
+
+  // The frame may need to redraw as a result of the activation change.
+  // We can get WM_NCACTIVATE before we're actually visible. If we're not
+  // visible, no need to paint.
+  if (IsVisible())
+    GetWidget()->non_client_view()->SchedulePaint();
+
+  if (!GetWidget()->ShouldUseNativeFrame()) {
+    // TODO(beng, et al): Hack to redraw this window and child windows
+    //     synchronously upon activation. Not all child windows are redrawing
+    //     themselves leading to issues like http://crbug.com/74604
+    //     We redraw out-of-process HWNDs asynchronously to avoid hanging the
+    //     whole app if a child HWND belonging to a hung plugin is encountered.
+    RedrawWindow(GetNativeView(), NULL, NULL,
+                 RDW_NOCHILDREN | RDW_INVALIDATE | RDW_UPDATENOW);
+    EnumChildWindows(GetNativeView(), EnumChildWindowsForRedraw, NULL);
+  }
+
+  // If we're active again, we should be allowed to render as inactive, so
+  // tell the non-client view.
+  bool inactive_rendering_disabled = delegate_->IsInactiveRenderingDisabled();
+  if (IsActive())
+    delegate_->EnableInactiveRendering();
+
+  // Avoid DefWindowProc non-client rendering over our custom frame.
+  if (!GetWidget()->ShouldUseNativeFrame()) {
+    SetMsgHandled(TRUE);
+    return TRUE;
+  }
+
+  return DefWindowProcWithRedrawLock(WM_NCACTIVATE,
+                                     inactive_rendering_disabled || active, 0);
+}
+
+LRESULT NativeWidgetWin::OnNCCalcSize(BOOL mode, LPARAM l_param) {
+  // We only override the default handling if we need to specify a custom
+  // non-client edge width. Note that in most cases "no insets" means no
+  // custom width, but in fullscreen mode we want a custom width of 0.
+  gfx::Insets insets = GetClientAreaInsets();
+  if (insets.empty() && !IsFullscreen()) {
+    SetMsgHandled(FALSE);
+    return 0;
+  }
+
+  RECT* client_rect = mode ?
+      &(reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param)->rgrc[0]) :
+      reinterpret_cast<RECT*>(l_param);
+  client_rect->left += insets.left();
+  client_rect->top += insets.top();
+  client_rect->bottom -= insets.bottom();
+  client_rect->right -= insets.right();
+  if (IsMaximized()) {
+    // Find all auto-hide taskbars along the screen edges and adjust in by the
+    // thickness of the auto-hide taskbar on each such edge, so the window isn't
+    // treated as a "fullscreen app", which would cause the taskbars to
+    // disappear.
+    HMONITOR monitor = MonitorFromWindow(GetNativeView(),
+                                         MONITOR_DEFAULTTONULL);
+    if (!monitor) {
+      // We might end up here if the window was previously minimized and the
+      // user clicks on the taskbar button to restore it in the previously
+      // maximized position. In that case WM_NCCALCSIZE is sent before the
+      // window coordinates are restored to their previous values, so our
+      // (left,top) would probably be (-32000,-32000) like all minimized
+      // windows. So the above MonitorFromWindow call fails, but if we check
+      // the window rect given with WM_NCCALCSIZE (which is our previous
+      // restored window position) we will get the correct monitor handle.
+      monitor = MonitorFromRect(client_rect, MONITOR_DEFAULTTONULL);
+      if (!monitor) {
+        // This is probably an extreme case that we won't hit, but if we don't
+        // intersect any monitor, let us not adjust the client rect since our
+        // window will not be visible anyway.
+        return 0;
+      }
+    }
+    if (GetTopmostAutoHideTaskbarForEdge(ABE_LEFT, monitor))
+      client_rect->left += kAutoHideTaskbarThicknessPx;
+    if (GetTopmostAutoHideTaskbarForEdge(ABE_TOP, monitor)) {
+      if (GetWidget()->ShouldUseNativeFrame()) {
+        // Tricky bit.  Due to a bug in DwmDefWindowProc()'s handling of
+        // WM_NCHITTEST, having any nonclient area atop the window causes the
+        // caption buttons to draw onscreen but not respond to mouse
+        // hover/clicks.
+        // So for a taskbar at the screen top, we can't push the
+        // client_rect->top down; instead, we move the bottom up by one pixel,
+        // which is the smallest change we can make and still get a client area
+        // less than the screen size. This is visibly ugly, but there seems to
+        // be no better solution.
+        --client_rect->bottom;
+      } else {
+        client_rect->top += kAutoHideTaskbarThicknessPx;
+      }
+    }
+    if (GetTopmostAutoHideTaskbarForEdge(ABE_RIGHT, monitor))
+      client_rect->right -= kAutoHideTaskbarThicknessPx;
+    if (GetTopmostAutoHideTaskbarForEdge(ABE_BOTTOM, monitor))
+      client_rect->bottom -= kAutoHideTaskbarThicknessPx;
+
+    // We cannot return WVR_REDRAW when there is nonclient area, or Windows
+    // exhibits bugs where client pixels and child HWNDs are mispositioned by
+    // the width/height of the upper-left nonclient area.
+    return 0;
+  }
+
+  // If the window bounds change, we're going to relayout and repaint anyway.
+  // Returning WVR_REDRAW avoids an extra paint before that of the old client
+  // pixels in the (now wrong) location, and thus makes actions like resizing a
+  // window from the left edge look slightly less broken.
+  // We special case when left or top insets are 0, since these conditions
+  // actually require another repaint to correct the layout after glass gets
+  // turned on and off.
+  if (insets.left() == 0 || insets.top() == 0)
+    return 0;
+  return mode ? WVR_REDRAW : 0;
+}
+
+LRESULT NativeWidgetWin::OnNCHitTest(const CPoint& point) {
+  if (!GetWidget()->non_client_view()) {
+    SetMsgHandled(FALSE);
+    return 0;
+  }
+
+  // If the DWM is rendering the window controls, we need to give the DWM's
+  // default window procedure first chance to handle hit testing.
+  if (GetWidget()->ShouldUseNativeFrame()) {
+    LRESULT result;
+    if (DwmDefWindowProc(GetNativeView(), WM_NCHITTEST, 0,
+                         MAKELPARAM(point.x, point.y), &result)) {
+      return result;
+    }
+  }
+
+  // First, give the NonClientView a chance to test the point to see if it
+  // provides any of the non-client area.
+  POINT temp = point;
+  MapWindowPoints(HWND_DESKTOP, GetNativeView(), &temp, 1);
+  int component = delegate_->GetNonClientComponent(gfx::Point(temp));
+  if (component != HTNOWHERE)
+    return component;
+
+  // Otherwise, we let Windows do all the native frame non-client handling for
+  // us.
+  SetMsgHandled(FALSE);
+  return 0;
+}
+
+void NativeWidgetWin::OnNCPaint(HRGN rgn) {
+  // We only do non-client painting if we're not using the native frame.
+  // It's required to avoid some native painting artifacts from appearing when
+  // the window is resized.
+  if (!GetWidget()->non_client_view() || GetWidget()->ShouldUseNativeFrame()) {
+    SetMsgHandled(FALSE);
+    return;
+  }
+
+  // We have an NC region and need to paint it. We expand the NC region to
+  // include the dirty region of the root view. This is done to minimize
+  // paints.
+  CRect window_rect;
+  GetWindowRect(&window_rect);
+
+  if (window_rect.Width() != GetWidget()->GetRootView()->width() ||
+      window_rect.Height() != GetWidget()->GetRootView()->height()) {
+    // If the size of the window differs from the size of the root view it
+    // means we're being asked to paint before we've gotten a WM_SIZE. This can
+    // happen when the user is interactively resizing the window. To avoid
+    // mass flickering we don't do anything here. Once we get the WM_SIZE we'll
+    // reset the region of the window which triggers another WM_NCPAINT and
+    // all is well.
+    return;
+  }
+
+  CRect dirty_region;
+  // A value of 1 indicates paint all.
+  if (!rgn || rgn == reinterpret_cast<HRGN>(1)) {
+    dirty_region = CRect(0, 0, window_rect.Width(), window_rect.Height());
+  } else {
+    RECT rgn_bounding_box;
+    GetRgnBox(rgn, &rgn_bounding_box);
+    if (!IntersectRect(&dirty_region, &rgn_bounding_box, &window_rect))
+      return;  // Dirty region doesn't intersect window bounds, bale.
+
+    // rgn_bounding_box is in screen coordinates. Map it to window coordinates.
+    OffsetRect(&dirty_region, -window_rect.left, -window_rect.top);
+  }
+
+  // In theory GetDCEx should do what we want, but I couldn't get it to work.
+  // In particular the docs mentiond DCX_CLIPCHILDREN, but as far as I can tell
+  // it doesn't work at all. So, instead we get the DC for the window then
+  // manually clip out the children.
+  HDC dc = GetWindowDC(GetNativeView());
+  ClipState clip_state;
+  clip_state.x = window_rect.left;
+  clip_state.y = window_rect.top;
+  clip_state.parent = GetNativeView();
+  clip_state.dc = dc;
+  EnumChildWindows(GetNativeView(), &ClipDCToChild,
+                   reinterpret_cast<LPARAM>(&clip_state));
+
+  gfx::Rect old_paint_region = invalid_rect();
+
+  if (!old_paint_region.IsEmpty()) {
+    // The root view has a region that needs to be painted. Include it in the
+    // region we're going to paint.
+
+    CRect old_paint_region_crect = old_paint_region.ToRECT();
+    CRect tmp = dirty_region;
+    UnionRect(&dirty_region, &tmp, &old_paint_region_crect);
+  }
+
+  GetWidget()->GetRootView()->SchedulePaintInRect(gfx::Rect(dirty_region));
+
+  // gfx::CanvasSkiaPaint's destructor does the actual painting. As such, wrap
+  // the following in a block to force paint to occur so that we can release
+  // the dc.
+  {
+    gfx::CanvasSkiaPaint canvas(dc, true, dirty_region.left,
+                                dirty_region.top, dirty_region.Width(),
+                                dirty_region.Height());
+    delegate_->OnNativeWidgetPaint(&canvas);
+  }
+
+  ReleaseDC(GetNativeView(), dc);
+  // When using a custom frame, we want to avoid calling DefWindowProc() since
+  // that may render artifacts.
+  SetMsgHandled(!GetWidget()->ShouldUseNativeFrame());
+}
+
+LRESULT NativeWidgetWin::OnNCUAHDrawCaption(UINT msg,
+                                            WPARAM w_param,
+                                            LPARAM l_param) {
+  // See comment in widget_win.h at the definition of WM_NCUAHDRAWCAPTION for
+  // an explanation about why we need to handle this message.
+  SetMsgHandled(!GetWidget()->ShouldUseNativeFrame());
+  return 0;
+}
+
+LRESULT NativeWidgetWin::OnNCUAHDrawFrame(UINT msg,
+                                          WPARAM w_param,
+                                          LPARAM l_param) {
+  // See comment in widget_win.h at the definition of WM_NCUAHDRAWCAPTION for
+  // an explanation about why we need to handle this message.
+  SetMsgHandled(!GetWidget()->ShouldUseNativeFrame());
+  return 0;
+}
+
+LRESULT NativeWidgetWin::OnNotify(int w_param, NMHDR* l_param) {
+  // We can be sent this message before the tooltip manager is created, if a
+  // subclass overrides OnCreate and creates some kind of Windows control there
+  // that sends WM_NOTIFY messages.
+  if (tooltip_manager_.get()) {
+    bool handled;
+    LRESULT result = tooltip_manager_->OnNotify(w_param, l_param, &handled);
+    SetMsgHandled(handled);
+    return result;
+  }
+  SetMsgHandled(FALSE);
+  return 0;
+}
+
+void NativeWidgetWin::OnPaint(HDC dc) {
+  RECT dirty_rect;
+  // Try to paint accelerated first.
+  if (GetUpdateRect(hwnd(), &dirty_rect, FALSE) &&
+      !IsRectEmpty(&dirty_rect)) {
+    if (delegate_->OnNativeWidgetPaintAccelerated(
+        gfx::Rect(dirty_rect))) {
+      ValidateRect(hwnd(), NULL);
+    } else {
+      scoped_ptr<gfx::CanvasPaint> canvas(
+          gfx::CanvasPaint::CreateCanvasPaint(hwnd()));
+      delegate_->OnNativeWidgetPaint(canvas->AsCanvas());
+    }
+  } else {
+    // TODO(msw): Find a better solution for this crbug.com/93530 workaround.
+    // Some scenarios otherwise fail to validate minimized app/popup windows.
+    ValidateRect(hwnd(), NULL);
+  }
+}
+
+LRESULT NativeWidgetWin::OnPowerBroadcast(DWORD power_event, DWORD data) {
+  base::SystemMonitor* monitor = base::SystemMonitor::Get();
+  if (monitor)
+    monitor->ProcessWmPowerBroadcastMessage(power_event);
+  SetMsgHandled(FALSE);
+  return 0;
+}
+
+LRESULT NativeWidgetWin::OnReflectedMessage(UINT msg,
+                                            WPARAM w_param,
+                                            LPARAM l_param) {
+  SetMsgHandled(FALSE);
+  return 0;
+}
+
+LRESULT NativeWidgetWin::OnSetCursor(UINT message,
+                                     WPARAM w_param,
+                                     LPARAM l_param) {
+  // Using ScopedRedrawLock here frequently allows content behind this window to
+  // paint in front of this window, causing glaring rendering artifacts.
+  // If omitting ScopedRedrawLock here triggers caption rendering artifacts via
+  // DefWindowProc message handling, we'll need to find a better solution.
+  SetMsgHandled(FALSE);
+  return 0;
+}
+
+void NativeWidgetWin::OnSetFocus(HWND focused_window) {
+  delegate_->OnNativeFocus(focused_window);
+  InputMethod* input_method = GetWidget()->GetInputMethodDirect();
+  if (input_method)
+    input_method->OnFocus();
+  SetMsgHandled(FALSE);
+}
+
+LRESULT NativeWidgetWin::OnSetIcon(UINT size_type, HICON new_icon) {
+  // This shouldn't hurt even if we're using the native frame.
+  return DefWindowProcWithRedrawLock(WM_SETICON, size_type,
+                                     reinterpret_cast<LPARAM>(new_icon));
+}
+
+LRESULT NativeWidgetWin::OnSetText(const wchar_t* text) {
+  // This shouldn't hurt even if we're using the native frame.
+  return DefWindowProcWithRedrawLock(WM_SETTEXT, NULL,
+                                     reinterpret_cast<LPARAM>(text));
+}
+
+void NativeWidgetWin::OnSettingChange(UINT flags, const wchar_t* section) {
+  if (!GetParent() && (flags == SPI_SETWORKAREA) &&
+      !GetWidget()->widget_delegate()->WillProcessWorkAreaChange()) {
+    // Fire a dummy SetWindowPos() call, so we'll trip the code in
+    // OnWindowPosChanging() below that notices work area changes.
+    ::SetWindowPos(GetNativeView(), 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE |
+        SWP_NOZORDER | SWP_NOREDRAW | SWP_NOACTIVATE | SWP_NOOWNERZORDER);
+    SetMsgHandled(TRUE);
+  } else {
+    // TODO(beng): move to Widget.
+    if (flags == SPI_SETWORKAREA)
+      GetWidget()->widget_delegate()->OnWorkAreaChanged();
+    SetMsgHandled(FALSE);
+  }
+}
+
+void NativeWidgetWin::OnSize(UINT param, const CSize& size) {
+  RedrawWindow(GetNativeView(), NULL, NULL, RDW_INVALIDATE | RDW_ALLCHILDREN);
+  // ResetWindowRegion is going to trigger WM_NCPAINT. By doing it after we've
+  // invoked OnSize we ensure the RootView has been laid out.
+  ResetWindowRegion(false);
+}
+
+void NativeWidgetWin::OnSysCommand(UINT notification_code, CPoint click) {
+  if (!GetWidget()->non_client_view())
+    return;
+
+  // Windows uses the 4 lower order bits of |notification_code| for type-
+  // specific information so we must exclude this when comparing.
+  static const int sc_mask = 0xFFF0;
+  // Ignore size/move/maximize in fullscreen mode.
+  if (IsFullscreen() &&
+      (((notification_code & sc_mask) == SC_SIZE) ||
+       ((notification_code & sc_mask) == SC_MOVE) ||
+       ((notification_code & sc_mask) == SC_MAXIMIZE)))
+    return;
+  if (!GetWidget()->ShouldUseNativeFrame()) {
+    if ((notification_code & sc_mask) == SC_MINIMIZE ||
+        (notification_code & sc_mask) == SC_MAXIMIZE ||
+        (notification_code & sc_mask) == SC_RESTORE) {
+      GetWidget()->non_client_view()->ResetWindowControls();
+    } else if ((notification_code & sc_mask) == SC_MOVE ||
+               (notification_code & sc_mask) == SC_SIZE) {
+      if (!IsVisible()) {
+        // Circumvent ScopedRedrawLocks and force visibility before entering a
+        // resize or move modal loop to get continuous sizing/moving feedback.
+        SetWindowLong(GWL_STYLE, GetWindowLong(GWL_STYLE) | WS_VISIBLE);
+      }
+    }
+  }
+
+  // Handle SC_KEYMENU, which means that the user has pressed the ALT
+  // key and released it, so we should focus the menu bar.
+  if ((notification_code & sc_mask) == SC_KEYMENU && click.x == 0) {
+    // Retrieve the status of shift and control keys to prevent consuming
+    // shift+alt keys, which are used by Windows to change input languages.
+    ui::Accelerator accelerator(ui::KeyboardCodeForWindowsKeyCode(VK_MENU),
+                                !!(GetKeyState(VK_SHIFT) & 0x8000),
+                                !!(GetKeyState(VK_CONTROL) & 0x8000),
+                                false);
+    GetWidget()->GetFocusManager()->ProcessAccelerator(accelerator);
+    return;
+  }
+
+  // If the delegate can't handle it, the system implementation will be called.
+  if (!delegate_->ExecuteCommand(notification_code)) {
+    DefWindowProc(GetNativeView(), WM_SYSCOMMAND, notification_code,
+                  MAKELPARAM(click.x, click.y));
+  }
+}
+
+void NativeWidgetWin::OnThemeChanged() {
+  // Notify NativeThemeWin.
+  gfx::NativeThemeWin::instance()->CloseHandles();
+}
+
+void NativeWidgetWin::OnVScroll(int scroll_type,
+                                short position,
+                                HWND scrollbar) {
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnWindowPosChanging(WINDOWPOS* window_pos) {
+  if (ignore_window_pos_changes_) {
+    // If somebody's trying to toggle our visibility, change the nonclient area,
+    // change our Z-order, or activate us, we should probably let it go through.
+    if (!(window_pos->flags & ((IsVisible() ? SWP_HIDEWINDOW : SWP_SHOWWINDOW) |
+        SWP_FRAMECHANGED)) &&
+        (window_pos->flags & (SWP_NOZORDER | SWP_NOACTIVATE))) {
+      // Just sizing/moving the window; ignore.
+      window_pos->flags |= SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW;
+      window_pos->flags &= ~(SWP_SHOWWINDOW | SWP_HIDEWINDOW);
+    }
+  } else if (!GetParent()) {
+    CRect window_rect;
+    HMONITOR monitor;
+    gfx::Rect monitor_rect, work_area;
+    if (GetWindowRect(&window_rect) &&
+        GetMonitorAndRects(window_rect, &monitor, &monitor_rect, &work_area)) {
+      if (monitor && (monitor == last_monitor_) &&
+          (IsFullscreen() || ((monitor_rect == last_monitor_rect_) &&
+              (work_area != last_work_area_)))) {
+        // A rect for the monitor we're on changed.  Normally Windows notifies
+        // us about this (and thus we're reaching here due to the SetWindowPos()
+        // call in OnSettingChange() above), but with some software (e.g.
+        // nVidia's nView desktop manager) the work area can change asynchronous
+        // to any notification, and we're just sent a SetWindowPos() call with a
+        // new (frequently incorrect) position/size.  In either case, the best
+        // response is to throw away the existing position/size information in
+        // |window_pos| and recalculate it based on the new work rect.
+        gfx::Rect new_window_rect;
+        if (IsFullscreen()) {
+          new_window_rect = monitor_rect;
+        } else if (IsZoomed()) {
+          new_window_rect = work_area;
+          int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
+          new_window_rect.Inset(-border_thickness, -border_thickness);
+        } else {
+          new_window_rect = gfx::Rect(window_rect).AdjustToFit(work_area);
+        }
+        window_pos->x = new_window_rect.x();
+        window_pos->y = new_window_rect.y();
+        window_pos->cx = new_window_rect.width();
+        window_pos->cy = new_window_rect.height();
+        // WARNING!  Don't set SWP_FRAMECHANGED here, it breaks moving the child
+        // HWNDs for some reason.
+        window_pos->flags &= ~(SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW);
+        window_pos->flags |= SWP_NOCOPYBITS;
+
+        // Now ignore all immediately-following SetWindowPos() changes.  Windows
+        // likes to (incorrectly) recalculate what our position/size should be
+        // and send us further updates.
+        ignore_window_pos_changes_ = true;
+        DCHECK(!ignore_pos_changes_factory_.HasWeakPtrs());
+        MessageLoop::current()->PostTask(
+            FROM_HERE,
+            base::Bind(&NativeWidgetWin::StopIgnoringPosChanges,
+                       ignore_pos_changes_factory_.GetWeakPtr()));
+      }
+      last_monitor_ = monitor;
+      last_monitor_rect_ = monitor_rect;
+      last_work_area_ = work_area;
+    }
+  }
+
+  if (force_hidden_count_) {
+    // Prevent the window from being made visible if we've been asked to do so.
+    // See comment in header as to why we might want this.
+    window_pos->flags &= ~SWP_SHOWWINDOW;
+  }
+
+  // When WM_WINDOWPOSCHANGING message is handled by DefWindowProc, it will
+  // enforce (cx, cy) not to be smaller than (6, 6) for any non-popup window.
+  // We work around this by changing cy back to our intended value.
+  if (!GetParent() && ~(window_pos->flags & SWP_NOSIZE) && window_pos->cy < 6) {
+    LONG old_cy = window_pos->cy;
+    DefWindowProc(GetNativeView(), WM_WINDOWPOSCHANGING, 0,
+        reinterpret_cast<LPARAM>(window_pos));
+    window_pos->cy = old_cy;
+    SetMsgHandled(TRUE);
+    return;
+  }
+
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnWindowPosChanged(WINDOWPOS* window_pos) {
+  if (DidClientAreaSizeChange(window_pos))
+    ClientAreaSizeChanged();
+  if (window_pos->flags & SWP_SHOWWINDOW)
+    delegate_->OnNativeWidgetVisibilityChanged(true);
+  else if (window_pos->flags & SWP_HIDEWINDOW)
+    delegate_->OnNativeWidgetVisibilityChanged(false);
+  SetMsgHandled(FALSE);
+}
+
+void NativeWidgetWin::OnFinalMessage(HWND window) {
+  // We don't destroy props in WM_DESTROY as we may still get messages after
+  // WM_DESTROY that assume the properties are still valid (such as WM_CLOSE).
+  props_.reset();
+  delegate_->OnNativeWidgetDestroyed();
+  if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET)
+    delete this;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, protected:
+
+int NativeWidgetWin::GetShowState() const {
+  return SW_SHOWNORMAL;
+}
+
+gfx::Insets NativeWidgetWin::GetClientAreaInsets() const {
+  // Returning an empty Insets object causes the default handling in
+  // NativeWidgetWin::OnNCCalcSize() to be invoked.
+  if (!has_non_client_view_ || GetWidget()->ShouldUseNativeFrame())
+    return gfx::Insets();
+
+  if (IsMaximized()) {
+    // Windows automatically adds a standard width border to all sides when a
+    // window is maximized.
+    int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
+    return gfx::Insets(border_thickness, border_thickness, border_thickness,
+                       border_thickness);
+  }
+  // This is weird, but highly essential. If we don't offset the bottom edge
+  // of the client rect, the window client area and window area will match,
+  // and when returning to glass rendering mode from non-glass, the client
+  // area will not paint black as transparent. This is because (and I don't
+  // know why) the client area goes from matching the window rect to being
+  // something else. If the client area is not the window rect in both
+  // modes, the blackness doesn't occur. Because of this, we need to tell
+  // the RootView to lay out to fit the window rect, rather than the client
+  // rect when using the opaque frame.
+  // Note: this is only required for non-fullscreen windows. Note that
+  // fullscreen windows are in restored state, not maximized.
+  return gfx::Insets(0, 0, IsFullscreen() ? 0 : 1, 0);
+}
+
+void NativeWidgetWin::TrackMouseEvents(DWORD mouse_tracking_flags) {
+  // Begin tracking mouse events for this HWND so that we get WM_MOUSELEAVE
+  // when the user moves the mouse outside this HWND's bounds.
+  if (active_mouse_tracking_flags_ == 0 || mouse_tracking_flags & TME_CANCEL) {
+    if (mouse_tracking_flags & TME_CANCEL) {
+      // We're about to cancel active mouse tracking, so empty out the stored
+      // state.
+      active_mouse_tracking_flags_ = 0;
+    } else {
+      active_mouse_tracking_flags_ = mouse_tracking_flags;
+    }
+
+    TRACKMOUSEEVENT tme;
+    tme.cbSize = sizeof(tme);
+    tme.dwFlags = mouse_tracking_flags;
+    tme.hwndTrack = hwnd();
+    tme.dwHoverTime = 0;
+    TrackMouseEvent(&tme);
+  } else if (mouse_tracking_flags != active_mouse_tracking_flags_) {
+    TrackMouseEvents(active_mouse_tracking_flags_ | TME_CANCEL);
+    TrackMouseEvents(mouse_tracking_flags);
+  }
+}
+
+void NativeWidgetWin::OnScreenReaderDetected() {
+  screen_reader_active_ = true;
+}
+
+void NativeWidgetWin::SetInitialFocus() {
+  if (!GetWidget()->SetInitialFocus() &&
+      !(GetWindowLong(GWL_EXSTYLE) & WS_EX_TRANSPARENT) &&
+      !(GetWindowLong(GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
+    // The window does not get keyboard messages unless we focus it.
+    SetFocus(GetNativeView());
+  }
+}
+
+void NativeWidgetWin::ExecuteSystemMenuCommand(int command) {
+  if (command)
+    SendMessage(GetNativeView(), WM_SYSCOMMAND, command, 0);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetWin, private:
+
+// static
+void NativeWidgetWin::PostProcessActivateMessage(NativeWidgetWin* widget,
+                                                 int activation_state) {
+  DCHECK(widget->GetWidget()->is_top_level());
+  FocusManager* focus_manager = widget->GetWidget()->GetFocusManager();
+  if (WA_INACTIVE == activation_state) {
+    // We might get activated/inactivated without being enabled, so we need to
+    // clear restore_focus_when_enabled_.
+    widget->restore_focus_when_enabled_ = false;
+    focus_manager->StoreFocusedView();
+  } else {
+    // We must restore the focus after the message has been DefProc'ed as it
+    // does set the focus to the last focused HWND.
+    // Note that if the window is not enabled, we cannot restore the focus as
+    // calling ::SetFocus on a child of the non-enabled top-window would fail.
+    // This is the case when showing a modal dialog (such as 'open file',
+    // 'print'...) from a different thread.
+    // In that case we delay the focus restoration to when the window is enabled
+    // again.
+    if (!IsWindowEnabled(widget->GetNativeView())) {
+      DCHECK(!widget->restore_focus_when_enabled_);
+      widget->restore_focus_when_enabled_ = true;
+      return;
+    }
+    focus_manager->RestoreFocusedView();
+  }
+}
+
+void NativeWidgetWin::SetInitParams(const Widget::InitParams& params) {
+  // Set non-style attributes.
+  ownership_ = params.ownership;
+
+  DWORD style = WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
+  DWORD ex_style = 0;
+  DWORD class_style = CS_DBLCLKS;
+
+  // Set type-independent style attributes.
+  if (params.child)
+    style |= WS_CHILD;
+  if (params.show_state == ui::SHOW_STATE_MAXIMIZED)
+    style |= WS_MAXIMIZE;
+  if (params.show_state == ui::SHOW_STATE_MINIMIZED)
+    style |= WS_MINIMIZE;
+  if (!params.accept_events)
+    ex_style |= WS_EX_TRANSPARENT;
+  if (!params.can_activate)
+    ex_style |= WS_EX_NOACTIVATE;
+  if (params.keep_on_top)
+    ex_style |= WS_EX_TOPMOST;
+  if (params.mirror_origin_in_rtl)
+    ex_style |= l10n_util::GetExtendedTooltipStyles();
+  if (params.transparent)
+    ex_style |= WS_EX_LAYERED;
+  if (params.has_dropshadow) {
+    class_style |= (base::win::GetVersion() < base::win::VERSION_XP) ?
+        0 : CS_DROPSHADOW;
+  }
+
+  // Set type-dependent style attributes.
+  switch (params.type) {
+    case Widget::InitParams::TYPE_WINDOW: {
+      style |= WS_SYSMENU | WS_CAPTION;
+      bool can_resize = GetWidget()->widget_delegate()->CanResize();
+      bool can_maximize = GetWidget()->widget_delegate()->CanMaximize();
+      if (can_maximize) {
+        style |= WS_OVERLAPPEDWINDOW;
+      } else if (can_resize) {
+        style |= WS_OVERLAPPED | WS_THICKFRAME;
+      }
+      if (delegate_->IsDialogBox()) {
+        style |= DS_MODALFRAME;
+        // NOTE: Turning this off means we lose the close button, which is bad.
+        // Turning it on though means the user can maximize or size the window
+        // from the system menu, which is worse. We may need to provide our own
+        // menu to get the close button to appear properly.
+        // style &= ~WS_SYSMENU;
+
+        // Set the WS_POPUP style for modal dialogs. This ensures that the owner
+        // window is activated on destruction. This style should not be set for
+        // non-modal non-top-level dialogs like constrained windows.
+        style |= delegate_->IsModal() ? WS_POPUP : 0;
+      }
+      ex_style |= delegate_->IsDialogBox() ? WS_EX_DLGMODALFRAME : 0;
+      break;
+    }
+    case Widget::InitParams::TYPE_CONTROL:
+      style |= WS_VISIBLE;
+      break;
+    case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
+      style |= WS_POPUP;
+      break;
+    case Widget::InitParams::TYPE_BUBBLE:
+      style |= WS_POPUP;
+      style |= WS_CLIPCHILDREN;
+      break;
+    case Widget::InitParams::TYPE_POPUP:
+      style |= WS_POPUP;
+      ex_style |= WS_EX_TOOLWINDOW;
+      break;
+    case Widget::InitParams::TYPE_MENU:
+      style |= WS_POPUP;
+      break;
+    default:
+      NOTREACHED();
+  }
+
+  set_initial_class_style(class_style);
+  set_window_style(window_style() | style);
+  set_window_ex_style(window_ex_style() | ex_style);
+
+  has_non_client_view_ = Widget::RequiresNonClientView(params.type);
+}
+
+void NativeWidgetWin::RedrawInvalidRect() {
+  if (!use_layered_buffer_) {
+    RECT r = { 0, 0, 0, 0 };
+    if (GetUpdateRect(hwnd(), &r, FALSE) && !IsRectEmpty(&r)) {
+      RedrawWindow(hwnd(), &r, NULL,
+                   RDW_INVALIDATE | RDW_UPDATENOW | RDW_NOCHILDREN);
+    }
+  }
+}
+
+void NativeWidgetWin::RedrawLayeredWindowContents() {
+  if (invalid_rect_.IsEmpty())
+    return;
+
+  // We need to clip to the dirty rect ourselves.
+  layered_window_contents_->sk_canvas()->save(SkCanvas::kClip_SaveFlag);
+  layered_window_contents_->ClipRect(invalid_rect_);
+  GetWidget()->GetRootView()->Paint(layered_window_contents_.get());
+  layered_window_contents_->sk_canvas()->restore();
+
+  RECT wr;
+  GetWindowRect(&wr);
+  SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
+  POINT position = {wr.left, wr.top};
+  HDC dib_dc = skia::BeginPlatformPaint(layered_window_contents_->sk_canvas());
+  POINT zero = {0, 0};
+  BLENDFUNCTION blend = {AC_SRC_OVER, 0, layered_alpha_, AC_SRC_ALPHA};
+  UpdateLayeredWindow(hwnd(), NULL, &position, &size, dib_dc, &zero,
+                      RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
+  invalid_rect_.SetRect(0, 0, 0, 0);
+  skia::EndPlatformPaint(layered_window_contents_->sk_canvas());
+}
+
+void NativeWidgetWin::LockUpdates() {
+  // We skip locked updates when Aero is on for two reasons:
+  // 1. Because it isn't necessary
+  // 2. Because toggling the WS_VISIBLE flag may occur while the GPU process is
+  //    attempting to present a child window's backbuffer onscreen. When these
+  //    two actions race with one another, the child window will either flicker
+  //    or will simply stop updating entirely.
+  if (!IsAeroGlassEnabled() && ++lock_updates_count_ == 1) {
+    SetWindowLong(GWL_STYLE, GetWindowLong(GWL_STYLE) & ~WS_VISIBLE);
+  }
+  // TODO(msw): Remove nested LockUpdates VLOG info for crbug.com/93530.
+  VLOG_IF(1, (lock_updates_count_ > 1)) << "Nested LockUpdates call: "
+      << lock_updates_count_ << " locks for widget " << this;
+}
+
+void NativeWidgetWin::UnlockUpdates() {
+  // TODO(msw): Remove nested LockUpdates VLOG info for crbug.com/93530.
+  VLOG_IF(1, (lock_updates_count_ > 1)) << "Nested UnlockUpdates call: "
+      << lock_updates_count_ << " locks for widget " << this;
+  if (!IsAeroGlassEnabled() && --lock_updates_count_ <= 0) {
+    SetWindowLong(GWL_STYLE, GetWindowLong(GWL_STYLE) | WS_VISIBLE);
+    lock_updates_count_ = 0;
+  }
+}
+
+bool NativeWidgetWin::WidgetSizeIsClientSize() const {
+  const Widget* widget = GetWidget()->GetTopLevelWidget();
+  return IsZoomed() || (widget && widget->ShouldUseNativeFrame());
+}
+
+void NativeWidgetWin::ClientAreaSizeChanged() {
+  RECT r;
+  if (WidgetSizeIsClientSize())
+    GetClientRect(&r);
+  else
+    GetWindowRect(&r);
+  gfx::Size s(std::max(0, static_cast<int>(r.right - r.left)),
+              std::max(0, static_cast<int>(r.bottom - r.top)));
+  if (compositor_.get())
+    compositor_->WidgetSizeChanged(s);
+  delegate_->OnNativeWidgetSizeChanged(s);
+  if (use_layered_buffer_) {
+    layered_window_contents_.reset(
+        new gfx::CanvasSkia(s.width(), s.height(), false));
+  }
+}
+
+void NativeWidgetWin::ResetWindowRegion(bool force) {
+  // A native frame uses the native window region, and we don't want to mess
+  // with it.
+  if (GetWidget()->ShouldUseNativeFrame() || !GetWidget()->non_client_view()) {
+    if (force)
+      SetWindowRgn(NULL, TRUE);
+    return;
+  }
+
+  // Changing the window region is going to force a paint. Only change the
+  // window region if the region really differs.
+  HRGN current_rgn = CreateRectRgn(0, 0, 0, 0);
+  int current_rgn_result = GetWindowRgn(GetNativeView(), current_rgn);
+
+  CRect window_rect;
+  GetWindowRect(&window_rect);
+  HRGN new_region;
+  if (IsMaximized()) {
+    HMONITOR monitor =
+        MonitorFromWindow(GetNativeView(), MONITOR_DEFAULTTONEAREST);
+    MONITORINFO mi;
+    mi.cbSize = sizeof mi;
+    GetMonitorInfo(monitor, &mi);
+    CRect work_rect = mi.rcWork;
+    work_rect.OffsetRect(-window_rect.left, -window_rect.top);
+    new_region = CreateRectRgnIndirect(&work_rect);
+  } else {
+    gfx::Path window_mask;
+    GetWidget()->non_client_view()->GetWindowMask(
+        gfx::Size(window_rect.Width(), window_rect.Height()), &window_mask);
+    new_region = window_mask.CreateNativeRegion();
+  }
+
+  if (current_rgn_result == ERROR || !EqualRgn(current_rgn, new_region)) {
+    // SetWindowRgn takes ownership of the HRGN created by CreateNativeRegion.
+    SetWindowRgn(new_region, TRUE);
+  } else {
+    DeleteObject(new_region);
+  }
+
+  DeleteObject(current_rgn);
+}
+
+LRESULT NativeWidgetWin::DefWindowProcWithRedrawLock(UINT message,
+                                                     WPARAM w_param,
+                                                     LPARAM l_param) {
+  ScopedRedrawLock lock(this);
+  // The Widget and HWND can be destroyed in the call to DefWindowProc, so use
+  // the |destroyed_| flag to avoid unlocking (and crashing) after destruction.
+  bool destroyed = false;
+  destroyed_ = &destroyed;
+  LRESULT result = DefWindowProc(GetNativeView(), message, w_param, l_param);
+  if (destroyed)
+    lock.CancelUnlockOperation();
+  else
+    destroyed_ = NULL;
+  return result;
+}
+
+void NativeWidgetWin::RestoreEnabledIfNecessary() {
+  if (delegate_->IsModal() && !restored_enabled_) {
+    restored_enabled_ = true;
+    // If we were run modally, we need to undo the disabled-ness we inflicted on
+    // the owner's parent hierarchy.
+    HWND start = ::GetWindow(GetNativeView(), GW_OWNER);
+    while (start) {
+      ::EnableWindow(start, TRUE);
+      start = ::GetParent(start);
+    }
+  }
+}
+
+void NativeWidgetWin::DispatchKeyEventPostIME(const KeyEvent& key) {
+  SetMsgHandled(delegate_->OnKeyEvent(key));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Widget, public:
+
+// static
+void Widget::NotifyLocaleChanged() {
+  NOTIMPLEMENTED();
+}
+
+namespace {
+BOOL CALLBACK WindowCallbackProc(HWND hwnd, LPARAM lParam) {
+  Widget* widget = Widget::GetWidgetForNativeView(hwnd);
+  if (widget && widget->is_secondary_widget())
+    widget->Close();
+  return TRUE;
+}
+}  // namespace
+
+// static
+void Widget::CloseAllSecondaryWidgets() {
+  EnumThreadWindows(GetCurrentThreadId(), WindowCallbackProc, 0);
+}
+
+bool Widget::ConvertRect(const Widget* source,
+                         const Widget* target,
+                         gfx::Rect* rect) {
+  DCHECK(source);
+  DCHECK(target);
+  DCHECK(rect);
+
+  HWND source_hwnd = source->GetNativeView();
+  HWND target_hwnd = target->GetNativeView();
+  if (source_hwnd == target_hwnd)
+    return true;
+
+  RECT win_rect = rect->ToRECT();
+  if (::MapWindowPoints(source_hwnd, target_hwnd,
+                        reinterpret_cast<LPPOINT>(&win_rect),
+                        sizeof(RECT)/sizeof(POINT))) {
+    *rect = win_rect;
+    return true;
+  }
+  return false;
+}
+
+namespace internal {
+
+////////////////////////////////////////////////////////////////////////////////
+// internal::NativeWidgetPrivate, public:
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::CreateNativeWidget(
+    internal::NativeWidgetDelegate* delegate) {
+  return new NativeWidgetWin(delegate);
+}
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::GetNativeWidgetForNativeView(
+    gfx::NativeView native_view) {
+  return reinterpret_cast<NativeWidgetWin*>(
+      ViewProp::GetValue(native_view, kNativeWidgetKey));
+}
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::GetNativeWidgetForNativeWindow(
+    gfx::NativeWindow native_window) {
+  return GetNativeWidgetForNativeView(native_window);
+}
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::GetTopLevelNativeWidget(
+    gfx::NativeView native_view) {
+  if (!native_view)
+    return NULL;
+
+  // First, check if the top-level window is a Widget.
+  HWND root = ::GetAncestor(native_view, GA_ROOT);
+  if (!root)
+    return NULL;
+
+  NativeWidgetPrivate* widget = GetNativeWidgetForNativeView(root);
+  if (widget)
+    return widget;
+
+  // Second, try to locate the last Widget window in the parent hierarchy.
+  HWND parent_hwnd = native_view;
+  // If we fail to find the native widget pointer for the root then it probably
+  // means that the root belongs to a different process in which case we walk up
+  // the native view chain looking for a parent window which corresponds to a
+  // valid native widget. We only do this if we fail to find the native widget
+  // for the current native view which means it is being destroyed.
+  if (!widget && !GetNativeWidgetForNativeView(native_view)) {
+    parent_hwnd = ::GetAncestor(parent_hwnd, GA_PARENT);
+    if (!parent_hwnd)
+      return NULL;
+  }
+  NativeWidgetPrivate* parent_widget;
+  do {
+    parent_widget = GetNativeWidgetForNativeView(parent_hwnd);
+    if (parent_widget) {
+      widget = parent_widget;
+      parent_hwnd = ::GetAncestor(parent_hwnd, GA_PARENT);
+    }
+  } while (parent_hwnd != NULL && parent_widget != NULL);
+
+  return widget;
+}
+
+// static
+void NativeWidgetPrivate::GetAllChildWidgets(gfx::NativeView native_view,
+                                             Widget::Widgets* children) {
+  if (!native_view)
+    return;
+
+  Widget* widget = Widget::GetWidgetForNativeView(native_view);
+  if (widget)
+    children->insert(widget);
+  EnumChildWindows(native_view, EnumerateChildWindowsForNativeWidgets,
+                   reinterpret_cast<LPARAM>(children));
+}
+
+// static
+void NativeWidgetPrivate::ReparentNativeView(gfx::NativeView native_view,
+                                             gfx::NativeView new_parent) {
+  if (!native_view)
+    return;
+
+  HWND previous_parent = ::GetParent(native_view);
+  if (previous_parent == new_parent)
+    return;
+
+  Widget::Widgets widgets;
+  GetAllChildWidgets(native_view, &widgets);
+
+  // First notify all the widgets that they are being disassociated
+  // from their previous parent.
+  for (Widget::Widgets::iterator it = widgets.begin();
+       it != widgets.end(); ++it) {
+    // TODO(beng): Rename this notification to NotifyNativeViewChanging()
+    // and eliminate the bool parameter.
+    (*it)->NotifyNativeViewHierarchyChanged(false, previous_parent);
+  }
+
+  ::SetParent(native_view, new_parent);
+
+  // And now, notify them that they have a brand new parent.
+  for (Widget::Widgets::iterator it = widgets.begin();
+       it != widgets.end(); ++it) {
+    (*it)->NotifyNativeViewHierarchyChanged(true, new_parent);
+  }
+}
+
+// static
+bool NativeWidgetPrivate::IsMouseButtonDown() {
+  return (GetKeyState(VK_LBUTTON) & 0x80) ||
+    (GetKeyState(VK_RBUTTON) & 0x80) ||
+    (GetKeyState(VK_MBUTTON) & 0x80) ||
+    (GetKeyState(VK_XBUTTON1) & 0x80) ||
+    (GetKeyState(VK_XBUTTON2) & 0x80);
+}
+
+}  // namespace internal
+
+}  // namespace views