[WIP] Make content_shell run under Wayland

ui/views/widget/desktop_aura/desktop_window_tree_host_wayland.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/views/widget/desktop_aura/desktop_window_tree_host_wayland.h"
+
+#include "ui/aura/client/focus_client.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_property.h"
+#include "ui/aura/window_tree_host.h"
+#include "ui/display/screen.h"
+#include "ui/native_theme/native_theme_aura.h"
+#include "ui/ozone/public/ozone_platform.h"
+#include "ui/views/corewm/tooltip_aura.h"
+#include "ui/views/linux_ui/linux_ui.h"
+#include "ui/views/views_delegate.h"
+#include "ui/views/views_export.h"
+#include "ui/views/views_switches.h"
+#include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
+#include "ui/views/widget/desktop_aura/desktop_screen_wayland.h"
+#include "ui/views/widget/desktop_aura/desktop_window_tree_host.h"
+#include "ui/wm/core/window_util.h"
+#include "ui/wm/public/drag_drop_client.h"
+#include "ui/wm/public/window_move_client.h"
+
+namespace views {
+
+std::list<gfx::AcceleratedWidget>*
+DesktopWindowTreeHostWayland::open_windows_ = NULL;
+
+std::vector<aura::Window*>*
+DesktopWindowTreeHostWayland::aura_windows_ = NULL;
+
+DesktopWindowTreeHostWayland::DesktopWindowTreeHostWayland(
+    internal::NativeWidgetDelegate* native_widget_delegate,
+    DesktopNativeWidgetAura* desktop_native_widget_aura)
+    : aura::WindowTreeHost(),
+      state_(Uninitialized),
+      window_(0),
+      title_(base::string16()),
+      native_widget_delegate_(native_widget_delegate),
+      content_window_(nullptr),
+      desktop_native_widget_aura_(desktop_native_widget_aura),
+      window_parent_(nullptr),
+      window_children_(),
+      close_widget_factory_(this) {
+}
+
+DesktopWindowTreeHostWayland::~DesktopWindowTreeHostWayland() {
+  aura::client::SetWindowMoveClient(window(), NULL);
+  desktop_native_widget_aura_->OnDesktopWindowTreeHostDestroyed(this);
+  DestroyDispatcher();
+}
+
+void DesktopWindowTreeHostWayland::CleanUpWindowList() {
+  delete open_windows_;
+  open_windows_ = NULL;
+  if (aura_windows_) {
+    aura_windows_->clear();
+    delete aura_windows_;
+    aura_windows_ = NULL;
+  }
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::GetBoundsInScreen() const {
+  return platform_window_->GetBounds();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopWindowTreeHostWayland, DesktopWindowTreeHost implementation:
+
+void DesktopWindowTreeHostWayland::Init(
+    aura::Window* content_window,
+    const Widget::InitParams& params) {
+  content_window_ = content_window;
+  // In some situations, views tries to make a zero sized window, and that
+  // makes us crash. Make sure we have valid sizes.
+  Widget::InitParams sanitized_params = params;
+  if (sanitized_params.bounds.width() == 0)
+    sanitized_params.bounds.set_width(100);
+  if (sanitized_params.bounds.height() == 0)
+    sanitized_params.bounds.set_height(100);
+
+  platform_window_ =
+      ui::OzonePlatform::GetInstance()->CreatePlatformWindow(this,
+      sanitized_params.bounds);
+  DCHECK(window_);
+}
+
+void DesktopWindowTreeHostWayland::OnNativeWidgetCreated(
+    const Widget::InitParams& params) {
+  // If we're given a parent, we need to mark ourselves as transient to another
+  // window. Otherwise activation gets screwy.
+  gfx::NativeView parent = params.parent;
+  if (!params.child && params.parent)
+    wm::AddTransientChild(parent, content_window_);
+
+  native_widget_delegate_->OnNativeWidgetCreated(true);
+  open_windows().push_back(window_);
+  if (aura_windows_) {
+    aura_windows_->clear();
+    delete aura_windows_;
+    aura_windows_ = NULL;
+  }
+}
+
+std::unique_ptr<corewm::Tooltip>
+DesktopWindowTreeHostWayland::CreateTooltip() {
+  return std::unique_ptr<views::corewm::Tooltip>(
+      new views::corewm::TooltipAura);
+}
+
+std::unique_ptr<aura::client::DragDropClient>
+DesktopWindowTreeHostWayland::CreateDragDropClient(
+    DesktopNativeCursorManager* cursor_manager) {
+  return nullptr;
+}
+
+
+void DesktopWindowTreeHostWayland::Close() {
+  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).
+    base::MessageLoop::current()->task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&DesktopWindowTreeHostWayland::CloseNow,
+                   close_widget_factory_.GetWeakPtr()));
+  }
+}
+
+void DesktopWindowTreeHostWayland::CloseNow() {
+  if (!window_)
+    return;
+
+  unsigned widgetId = window_;
+  ReleaseCapture();
+  native_widget_delegate_->OnNativeWidgetDestroying();
+
+  // If we have children, close them. Use a copy for iteration because they'll
+  // remove themselves.
+  std::set<DesktopWindowTreeHostWayland*> window_children_copy =
+      window_children_;
+  for (std::set<DesktopWindowTreeHostWayland*>::iterator it =
+           window_children_copy.begin(); it != window_children_copy.end();
+       ++it) {
+    (*it)->CloseNow();
+  }
+  DCHECK(window_children_.empty());
+
+  // If we have a parent, remove ourselves from its children list.
+  if (window_parent_) {
+    window_parent_->window_children_.erase(this);
+    window_parent_ = NULL;
+  }
+
+  // Destroy the compositor before destroying the window since shutdown
+  // may try to swap, and the swap without a window causes an X error, which
+  // causes a crash with in-process renderer.
+  DestroyCompositor();
+
+  open_windows().remove(widgetId);
+  if (aura_windows_) {
+    aura_windows_->clear();
+    delete aura_windows_;
+    aura_windows_ = NULL;
+  }
+
+  // Actually free our native resources.
+  platform_window_->Close();
+  window_ = 0;
+  if (open_windows().empty())
+    CleanUpWindowList();
+
+  desktop_native_widget_aura_->OnHostClosed();
+}
+
+
+aura::WindowTreeHost* DesktopWindowTreeHostWayland::AsWindowTreeHost() {
+  return this;
+}
+
+void DesktopWindowTreeHostWayland::ShowWindowWithState(
+    ui::WindowShowState show_state) {
+  if (compositor())
+    compositor()->SetVisible(true);
+  state_ |= Visible;
+
+  switch (show_state) {
+    case ui::SHOW_STATE_NORMAL:
+      Activate();
+      break;
+    case ui::SHOW_STATE_MAXIMIZED:
+      Maximize();
+      break;
+    case ui::SHOW_STATE_MINIMIZED:
+      Minimize();
+      break;
+    case ui::SHOW_STATE_FULLSCREEN:
+      break;
+    default:
+      break;
+  }
+
+  native_widget_delegate_->AsWidget()->SetInitialFocus(show_state);
+}
+
+void DesktopWindowTreeHostWayland::ShowMaximizedWithBounds(
+    const gfx::Rect& restored_bounds) {
+  ShowWindowWithState(ui::SHOW_STATE_MAXIMIZED);
+  previous_bounds_ = restored_bounds;
+}
+
+bool DesktopWindowTreeHostWayland::IsVisible() const {
+  return state_ & Visible;
+}
+
+void DesktopWindowTreeHostWayland::SetSize(const gfx::Size& requested_size) {
+  gfx::Size size_in_pixels = ToPixelRect(gfx::Rect(requested_size)).size();
+  size_in_pixels = AdjustSize(size_in_pixels);
+  gfx::Rect new_bounds = platform_window_->GetBounds();
+  new_bounds.set_size(size_in_pixels);
+  platform_window_->SetBounds(new_bounds);
+}
+
+void DesktopWindowTreeHostWayland::StackAbove(aura::Window* window) {
+}
+
+void DesktopWindowTreeHostWayland::StackAtTop() {
+}
+
+void DesktopWindowTreeHostWayland::CenterWindow(const gfx::Size& size) {
+  gfx::Size size_in_pixels = ToPixelRect(gfx::Rect(size)).size();
+  gfx::Rect parent_bounds_in_pixels = GetWorkAreaBoundsInScreen();
+
+  // If |window_|'s transient parent bounds are big enough to contain |size|,
+  // use them instead.
+  if (wm::GetTransientParent(content_window_)) {
+    gfx::Rect transient_parent_rect =
+        wm::GetTransientParent(content_window_)->GetBoundsInScreen();
+    if (transient_parent_rect.height() >= size.height() &&
+      transient_parent_rect.width() >= size.width()) {
+      parent_bounds_in_pixels = ToPixelRect(transient_parent_rect);
+    }
+  }
+
+  gfx::Rect window_bounds_in_pixels(
+      parent_bounds_in_pixels.x() +
+          (parent_bounds_in_pixels.width() - size_in_pixels.width()) / 2,
+      parent_bounds_in_pixels.y() +
+          (parent_bounds_in_pixels.height() - size_in_pixels.height()) / 2,
+      size_in_pixels.width(), size_in_pixels.height());
+  // Don't size the window bigger than the parent, otherwise the user may not be
+  // able to close or move it.
+  window_bounds_in_pixels.AdjustToFit(parent_bounds_in_pixels);
+
+  SetBounds(window_bounds_in_pixels);
+}
+
+void DesktopWindowTreeHostWayland::GetWindowPlacement(
+    gfx::Rect* bounds,
+    ui::WindowShowState* show_state) const {
+  *bounds = GetRestoredBounds();
+
+  if (IsMinimized()) {
+    *show_state = ui::SHOW_STATE_MINIMIZED;
+  } else if (IsFullscreen()) {
+    *show_state = ui::SHOW_STATE_FULLSCREEN;
+  } else if (IsMaximized()) {
+    *show_state = ui::SHOW_STATE_MAXIMIZED;
+  } else if (!IsActive()) {
+    *show_state = ui::SHOW_STATE_INACTIVE;
+  } else {
+    *show_state = ui::SHOW_STATE_NORMAL;
+  }
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::GetWindowBoundsInScreen() const {
+  return platform_window_->GetBounds();
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::GetClientAreaBoundsInScreen() const {
+  // TODO(erg): The NativeWidgetAura version returns |bounds_|, claiming its
+  // needed for View::ConvertPointToScreen() to work
+  // correctly. DesktopWindowTreeHostWin::GetClientAreaBoundsInScreen() just
+  // asks windows what it thinks the client rect is.
+  //
+  // Attempts to calculate the rect by asking the NonClientFrameView what it
+  // thought its GetBoundsForClientView() were broke combobox drop down
+  // placement.
+  return platform_window_->GetBounds();
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::GetRestoredBounds() const {
+  if (!previous_bounds_.IsEmpty())
+    return ToDIPRect(previous_bounds_);
+
+  return GetWindowBoundsInScreen();
+}
+
+std::string DesktopWindowTreeHostWayland::GetWorkspace() const {
+  return std::string();
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::GetWorkAreaBoundsInScreen() const {
+  display::Screen *screen = display::Screen::GetScreen();
+  if (!screen)
+    NOTREACHED() << "Unable to retrieve valid display::Screen";
+
+  display::Display display = screen->GetPrimaryDisplay();
+  return ToDIPRect(display.bounds());
+}
+
+void DesktopWindowTreeHostWayland::SetShape(std::unique_ptr<SkRegion>
+    native_region) {
+  // NOTIMPLEMENTED();
+}
+
+void DesktopWindowTreeHostWayland::Activate() {
+  if (state_ & Visible) {
+    OnActivationChanged(true);
+  }
+}
+
+void DesktopWindowTreeHostWayland::Deactivate() {
+  OnActivationChanged(false);
+}
+
+bool DesktopWindowTreeHostWayland::IsActive() const {
+  return state_ & Active;
+}
+
+void DesktopWindowTreeHostWayland::Maximize() {
+  if (state_ & Maximized)
+    return;
+
+  state_ |= Maximized;
+  state_ &= ~Minimized;
+  previous_bounds_ = platform_window_->GetBounds();
+  platform_window_->Maximize();
+  if (IsMinimized())
+    ShowWindowWithState(ui::SHOW_STATE_MAXIMIZED);
+}
+
+void DesktopWindowTreeHostWayland::Minimize() {
+  if (state_ & Minimized)
+    return;
+
+  state_ |= Minimized;
+  previous_bounds_ = platform_window_->GetBounds();
+  ReleaseCapture();
+  compositor()->SetVisible(false);
+  content_window_->Hide();
+  platform_window_->Minimize();
+  Relayout();
+}
+
+void DesktopWindowTreeHostWayland::Restore() {
+  state_ &= ~Maximized;
+  if (state_ & Minimized) {
+    content_window_->Show();
+    compositor()->SetVisible(true);
+  }
+
+  platform_window_->Restore();
+  platform_window_->SetBounds(previous_bounds_);
+  previous_bounds_ = gfx::Rect();
+  Relayout();
+  if (state_ & Minimized) {
+    state_ &= ~Minimized;
+    ShowWindow();
+  }
+}
+
+bool DesktopWindowTreeHostWayland::IsMaximized() const {
+  return !IsFullscreen() && (state_ & Maximized);
+}
+
+bool DesktopWindowTreeHostWayland::IsMinimized() const {
+  return state_ & Minimized;
+}
+
+bool DesktopWindowTreeHostWayland::HasCapture() const {
+  return has_capture_;
+}
+
+
+void DesktopWindowTreeHostWayland::SetAlwaysOnTop(bool always_on_top) {
+  always_on_top_ = always_on_top;
+}
+
+bool DesktopWindowTreeHostWayland::IsAlwaysOnTop() const {
+  return always_on_top_;
+}
+
+void DesktopWindowTreeHostWayland::SetVisibleOnAllWorkspaces(
+    bool always_visible) {
+  NOTIMPLEMENTED();
+}
+
+bool DesktopWindowTreeHostWayland::IsVisibleOnAllWorkspaces() const {
+  return false;
+}
+
+bool DesktopWindowTreeHostWayland::SetWindowTitle(const base::string16& title) {
+  if (title.compare(title_)) {
+    platform_window_->SetTitle(title);
+    title_ = title;
+    return true;
+  }
+
+  return false;
+}
+
+void DesktopWindowTreeHostWayland::ClearNativeFocus() {
+  // This method is weird and misnamed. Instead of clearing the native focus,
+  // it sets the focus to our |content_window_|, which will trigger a cascade
+  // of focus changes into views.
+  if (content_window_ && aura::client::GetFocusClient(content_window_) &&
+      content_window_->Contains(
+          aura::client::GetFocusClient(content_window_)->GetFocusedWindow())) {
+    aura::client::GetFocusClient(content_window_)->FocusWindow(content_window_);
+  }
+}
+
+Widget::MoveLoopResult DesktopWindowTreeHostWayland::RunMoveLoop(
+    const gfx::Vector2d& drag_offset,
+    Widget::MoveLoopSource source,
+    Widget::MoveLoopEscapeBehavior escape_behavior) {
+  NOTIMPLEMENTED();
+  return Widget::MOVE_LOOP_SUCCESSFUL;
+}
+
+
+void DesktopWindowTreeHostWayland::EndMoveLoop() {
+  NOTIMPLEMENTED();
+}
+
+void DesktopWindowTreeHostWayland::SetVisibilityChangedAnimationsEnabled(
+    bool value) {
+  // Much like the previous NativeWidgetGtk, we don't have anything to do here.
+}
+
+bool DesktopWindowTreeHostWayland::ShouldUseNativeFrame() const {
+  return false;
+}
+
+bool DesktopWindowTreeHostWayland::ShouldWindowContentsBeTransparent() const {
+  return false;
+}
+
+void DesktopWindowTreeHostWayland::FrameTypeChanged() {
+  Widget::FrameType new_type =
+    native_widget_delegate_->AsWidget()->frame_type();
+  if (new_type == Widget::FRAME_TYPE_DEFAULT) {
+    // The default is determined by Widget::InitParams::remove_standard_frame
+    // and does not change.
+    return;
+  }
+
+  // Replace the frame and layout the contents. Even though we don't have a
+  // swapable glass frame like on Windows, we still replace the frame because
+  // the button assets don't update otherwise.
+  native_widget_delegate_->AsWidget()->non_client_view()->UpdateFrame();
+}
+
+void DesktopWindowTreeHostWayland::SetFullscreen(bool fullscreen) {
+  NOTIMPLEMENTED();
+}
+
+bool DesktopWindowTreeHostWayland::IsFullscreen() const {
+  return state_ & FullScreen;
+}
+
+void DesktopWindowTreeHostWayland::SetOpacity(float opacity) {
+  content_window_->layer()->SetOpacity(opacity / 255.0);
+}
+
+void DesktopWindowTreeHostWayland::SetWindowIcons(
+    const gfx::ImageSkia& window_icon, const gfx::ImageSkia& app_icon) {
+  NOTIMPLEMENTED();
+}
+
+void DesktopWindowTreeHostWayland::InitModalType(ui::ModalType modal_type) {
+  switch (modal_type) {
+    case ui::MODAL_TYPE_NONE:
+      break;
+    default:
+      // TODO(erg): Figure out under what situations |modal_type| isn't
+      // none. The comment in desktop_native_widget_aura.cc suggests that this
+      // is rare.
+      NOTIMPLEMENTED();
+  }
+}
+
+void DesktopWindowTreeHostWayland::FlashFrame(bool flash_frame) {
+  NOTIMPLEMENTED();
+}
+
+void DesktopWindowTreeHostWayland::OnRootViewLayout() {
+}
+
+void DesktopWindowTreeHostWayland::OnNativeWidgetFocus() {
+}
+
+void DesktopWindowTreeHostWayland::OnNativeWidgetBlur() {
+}
+
+bool DesktopWindowTreeHostWayland::IsAnimatingClosed() const {
+  return false;
+}
+
+bool DesktopWindowTreeHostWayland::IsTranslucentWindowOpacitySupported() const {
+  return false;
+}
+
+void DesktopWindowTreeHostWayland::SizeConstraintsChanged() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopWindowTreeHostWayland, aura::WindowTreeHost implementation:
+
+gfx::Transform DesktopWindowTreeHostWayland::GetRootTransform() const {
+  display::Display display = display::Screen::GetScreen()->GetPrimaryDisplay();
+  aura::Window* win = const_cast<aura::Window*>(window());
+  display = display::Screen::GetScreen()->GetDisplayNearestWindow(win);
+
+  float scale = display.device_scale_factor();
+  gfx::Transform transform;
+  transform.Scale(scale, scale);
+  return transform;
+}
+
+ui::EventSource* DesktopWindowTreeHostWayland::GetEventSource() {
+  return this;
+}
+
+gfx::AcceleratedWidget DesktopWindowTreeHostWayland::GetAcceleratedWidget() {
+  return window_;
+}
+
+void DesktopWindowTreeHostWayland::ShowImpl() {
+  if (state_ & Visible)
+    return;
+
+  ShowWindowWithState(ui::SHOW_STATE_NORMAL);
+  native_widget_delegate_->OnNativeWidgetVisibilityChanged(true);
+}
+
+void DesktopWindowTreeHostWayland::HideImpl() {
+  if (!(state_ & Visible))
+    return;
+
+  state_ &= ~Visible;
+  platform_window_->Hide();
+  native_widget_delegate_->OnNativeWidgetVisibilityChanged(false);
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::GetBounds() const {
+  return platform_window_->GetBounds();
+}
+
+void DesktopWindowTreeHostWayland::SetBounds(
+    const gfx::Rect& requested_bounds) {
+  gfx::Rect bounds(requested_bounds.origin(),
+                   AdjustSize(requested_bounds.size()));
+  platform_window_->SetBounds(bounds);
+}
+
+gfx::Point DesktopWindowTreeHostWayland::GetLocationOnNativeScreen() const {
+  return platform_window_->GetBounds().origin();
+}
+
+void DesktopWindowTreeHostWayland::SetCapture() {
+  if (has_capture_)
+    return;
+
+  has_capture_ = true;
+  platform_window_->SetCapture();
+}
+
+void DesktopWindowTreeHostWayland::ReleaseCapture() {
+  platform_window_->ReleaseCapture();
+  OnLostCapture();
+}
+
+void DesktopWindowTreeHostWayland::ShowWindow() {
+  ui::WindowShowState show_state = ui::SHOW_STATE_NORMAL;
+  if (IsMinimized()) {
+    show_state = ui::SHOW_STATE_MINIMIZED;
+  } else if (IsFullscreen()) {
+    show_state = ui::SHOW_STATE_FULLSCREEN;
+  } else if (IsMaximized()) {
+    show_state = ui::SHOW_STATE_MAXIMIZED;
+  } else if (!IsActive()) {
+    show_state = ui::SHOW_STATE_INACTIVE;
+  }
+
+  ShowWindowWithState(show_state);
+}
+
+void DesktopWindowTreeHostWayland::SetCursorNative(gfx::NativeCursor cursor) {
+  platform_window_->SetCursor(cursor.platform());
+}
+
+void DesktopWindowTreeHostWayland::MoveCursorToNative(
+    const gfx::Point& location) {
+  platform_window_->MoveCursorTo(location);
+}
+
+void DesktopWindowTreeHostWayland::OnCursorVisibilityChangedNative(bool show) {
+  // TODO(erg): Conditional on us enabling touch on desktop linux builds, do
+  // the same tap-to-click disabling here that chromeos does.
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ui::PlatformWindowDelegate implementation:
+void DesktopWindowTreeHostWayland::OnBoundsChanged(
+    const gfx::Rect& new_bounds) {
+
+  native_widget_delegate_->AsWidget()->OnNativeWidgetMove();
+  OnHostResized(new_bounds.size());
+  ResetWindowRegion();
+}
+
+void DesktopWindowTreeHostWayland::OnDamageRect(const gfx::Rect& damaged_rect) {
+  compositor()->ScheduleRedrawRect(damaged_rect);
+}
+
+void DesktopWindowTreeHostWayland::OnAcceleratedWidgetDestroyed() {
+  gfx::AcceleratedWidget window = compositor()->ReleaseAcceleratedWidget();
+  DCHECK_EQ(window, window_);
+  window_ = gfx::kNullAcceleratedWidget;
+}
+
+void DesktopWindowTreeHostWayland::OnActivationChanged(bool active) {
+  if (active == (state_ & Active))
+    return;
+
+  if (active) {
+    // Make sure the stacking order is correct. The activated window should be
+    // first one in list of open windows.
+    std::list<gfx::AcceleratedWidget>& windows = open_windows();
+    DCHECK(windows.size());
+    if (windows.front() != window_) {
+      windows.remove(window_);
+      windows.insert(windows.begin(), window_);
+    }
+
+    state_ |= Active;
+    OnHostActivated();
+  } else {
+    state_ &= ~Active;
+    ReleaseCapture();
+  }
+
+  desktop_native_widget_aura_->HandleActivationChanged(active);
+  native_widget_delegate_->AsWidget()->GetRootView()->SchedulePaint();
+}
+
+
+void DesktopWindowTreeHostWayland::OnLostCapture() {
+  OnHostLostWindowCapture();
+  has_capture_ = false;
+}
+
+void DesktopWindowTreeHostWayland::OnAcceleratedWidgetAvailable(
+      gfx::AcceleratedWidget widget,
+       float device_pixel_ratio) {
+  window_ = widget;
+  CreateCompositor();
+  WindowTreeHost::OnAcceleratedWidgetAvailable();
+}
+
+void DesktopWindowTreeHostWayland::OnCloseRequest() {
+  Close();
+}
+
+void DesktopWindowTreeHostWayland::OnClosed() {
+  CloseNow();
+}
+
+void DesktopWindowTreeHostWayland::OnWindowStateChanged(
+    ui::PlatformWindowState new_state) {
+
+  switch (new_state) {
+    case ui::PLATFORM_WINDOW_STATE_MAXIMIZED: {
+      if (state_ & Minimized) {
+        content_window_->Show();
+        compositor()->SetVisible(true);
+        state_ &= ~Minimized;
+      }
+      platform_window_->SetBounds(previous_bounds_);
+      previous_bounds_ = gfx::Rect();
+      Relayout();
+      break;
+    }
+    default:
+      break;
+  }
+}
+
+void DesktopWindowTreeHostWayland::DispatchEvent(ui::Event* event) {
+    SendEventToProcessor(event);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopWindowTreeHostWayland, private:
+
+void DesktopWindowTreeHostWayland::Relayout() {
+  Widget* widget = native_widget_delegate_->AsWidget();
+  NonClientView* non_client_view = widget->non_client_view();
+  // non_client_view may be NULL, especially during creation.
+  if (non_client_view) {
+    non_client_view->client_view()->InvalidateLayout();
+    non_client_view->InvalidateLayout();
+  }
+  widget->GetRootView()->Layout();
+  ResetWindowRegion();
+}
+
+std::list<gfx::AcceleratedWidget>&
+DesktopWindowTreeHostWayland::open_windows() {
+  if (!open_windows_)
+    open_windows_ = new std::list<gfx::AcceleratedWidget>();
+  return *open_windows_;
+}
+
+gfx::Size DesktopWindowTreeHostWayland::AdjustSize(
+    const gfx::Size& requested_size_in_pixels) {
+
+  std::vector<display::Display> displays =
+      display::Screen::GetScreen()->GetAllDisplays();
+  // Compare against all monitor sizes. The window manager can move the window
+  // to whichever monitor it wants.
+  for (size_t i = 0; i < displays.size(); ++i) {
+    if (requested_size_in_pixels == displays[i].GetSizeInPixel()) {
+      return gfx::Size(requested_size_in_pixels.width() - 1,
+                       requested_size_in_pixels.height() - 1);
+    }
+  }
+
+  // Do not request a 0x0 window size.
+  gfx::Size size_in_pixels = requested_size_in_pixels;
+  size_in_pixels.SetToMax(gfx::Size(1, 1));
+  return size_in_pixels;
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::ToDIPRect(
+    const gfx::Rect& rect_in_pixels) const {
+  gfx::RectF rect_in_dip = gfx::RectF(rect_in_pixels);
+  GetRootTransform().TransformRectReverse(&rect_in_dip);
+  return gfx::ToEnclosingRect(rect_in_dip);
+}
+
+gfx::Rect DesktopWindowTreeHostWayland::ToPixelRect(
+    const gfx::Rect& rect_in_dip) const {
+  gfx::RectF rect_in_pixels = gfx::RectF(rect_in_dip);
+  GetRootTransform().TransformRect(&rect_in_pixels);
+  return gfx::ToEnclosingRect(rect_in_pixels);
+}
+
+void DesktopWindowTreeHostWayland::ResetWindowRegion() {
+  if (custom_window_shape_)
+    return;
+
+  gfx::Path window_mask;
+  const gfx::Rect& bounds_in_pixels = platform_window_->GetBounds();
+  if (!IsMaximized() && !IsFullscreen()) {
+    views::Widget* widget = native_widget_delegate_->AsWidget();
+    if (widget->non_client_view()) {
+      // Some frame views define a custom (non-rectangular) window mask. If
+      // so, use it to define the window shape. If not, fall through.
+      widget->non_client_view()->GetWindowMask(bounds_in_pixels.size(),
+                                               &window_mask);
+    }
+  }
+}
+
+}  // namespace views