Fix X11TopmostWindowFinder

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 5fa2bc3beaf022b16f302f7284cc3f6310b65900..ab4a7ac112c993b09d51cc8b1b2bdf7b10e0093a 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -76,6 +76,7 @@ const char* kAtomsToCache[] = {
   "UTF8_STRING",
   "WM_DELETE_WINDOW",
   "WM_PROTOCOLS",
+  "_NET_FRAME_EXTENTS",
   "_NET_WM_CM_S0",
   "_NET_WM_ICON",
   "_NET_WM_NAME",
@@ -140,7 +141,8 @@ DesktopWindowTreeHostX11::DesktopWindowTreeHostX11(
       desktop_native_widget_aura_(desktop_native_widget_aura),
       content_window_(NULL),
       window_parent_(NULL),
-      custom_window_shape_(NULL),
+      window_shape_(NULL),
+      custom_window_shape_(false),
       urgency_hint_set_(false) {
 }
 
@@ -148,8 +150,8 @@ DesktopWindowTreeHostX11::~DesktopWindowTreeHostX11() {
   window()->ClearProperty(kHostForRootWindow);
   aura::client::SetWindowMoveClient(window(), NULL);
   desktop_native_widget_aura_->OnDesktopWindowTreeHostDestroyed(this);
-  if (custom_window_shape_)
-    XDestroyRegion(custom_window_shape_);
+  if (window_shape_)
+    XDestroyRegion(window_shape_);
   DestroyDispatcher();
 }
 
@@ -181,6 +183,16 @@ gfx::Rect DesktopWindowTreeHostX11::GetX11RootWindowBounds() const {
   return bounds_;
 }
 
+gfx::Rect DesktopWindowTreeHostX11::GetX11RootWindowOuterBounds() const {
+  gfx::Rect outer_bounds(bounds_);
+  outer_bounds.Inset(-native_window_frame_borders_);
+  return outer_bounds;
+}
+
+::Region DesktopWindowTreeHostX11::GetWindowShape() const {
+  return window_shape_;
+}
+
 void DesktopWindowTreeHostX11::HandleNativeWidgetActivationChanged(
     bool active) {
   if (active) {
@@ -332,8 +344,10 @@ aura::WindowTreeHost* DesktopWindowTreeHostX11::AsWindowTreeHost() {
 
 void DesktopWindowTreeHostX11::ShowWindowWithState(
     ui::WindowShowState show_state) {
-  if (!window_mapped_)
+  if (!window_mapped_) {
     MapWindow(show_state);
+    ResetWindowRegion();
+  }
 
   if (show_state == ui::SHOW_STATE_NORMAL ||
       show_state == ui::SHOW_STATE_MAXIMIZED) {
@@ -464,9 +478,10 @@ gfx::Rect DesktopWindowTreeHostX11::GetWorkAreaBoundsInScreen() const {
 }
 
 void DesktopWindowTreeHostX11::SetShape(gfx::NativeRegion native_region) {
-  if (custom_window_shape_)
-    XDestroyRegion(custom_window_shape_);
-  custom_window_shape_ = gfx::CreateRegionFromSkRegion(*native_region);
+  if (window_shape_)
+    XDestroyRegion(window_shape_);
+  custom_window_shape_ = true;
+  window_shape_ = gfx::CreateRegionFromSkRegion(*native_region);
   ResetWindowRegion();
   delete native_region;
 }
@@ -1112,6 +1127,68 @@ void DesktopWindowTreeHostX11::InitX11Window(
   CreateCompositor(GetAcceleratedWidget());
 }
 
+void DesktopWindowTreeHostX11::OnWMStateUpdated() {
+  std::vector< ::Atom> atom_list;
+  if (!ui::GetAtomArrayProperty(xwindow_, "_NET_WM_STATE", &atom_list))
+    return;
+
+  window_properties_.clear();
+  std::copy(atom_list.begin(), atom_list.end(),
+            inserter(window_properties_, window_properties_.begin()));
+
+  if (!restored_bounds_.IsEmpty() && !IsMaximized()) {
+    // If we have restored bounds, but WM_STATE no longer claims to be
+    // maximized, we should clear our restored bounds.
+    restored_bounds_ = gfx::Rect();
+  } else if (IsMaximized() && restored_bounds_.IsEmpty()) {
+    // The request that we become maximized originated from a different process.
+    // |bounds_| already contains our maximized bounds. Do a best effort attempt
+    // to get restored bounds by setting it to our previously set bounds (and if
+    // we get this wrong, we aren't any worse off since we'd otherwise be
+    // returning our maximized bounds).
+    restored_bounds_ = previous_bounds_;
+  }
+
+  is_fullscreen_ = HasWMSpecProperty("_NET_WM_STATE_FULLSCREEN");
+  is_always_on_top_ = HasWMSpecProperty("_NET_WM_STATE_ABOVE");
+
+  // Now that we have different window properties, we may need to relayout the
+  // window. (The windows code doesn't need this because their window change is
+  // synchronous.)
+  //
+  // TODO(erg): While this does work, there's a quick flash showing the
+  // tabstrip/toolbar/etc. when going into fullscreen mode before hiding those
+  // parts of the UI because we receive the sizing event from the window
+  // manager before we receive the event that changes the fullscreen state.
+  // Unsure what to do about that.
+  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();
+  // Refresh the window's border, which may need to be updated if we have
+  // changed the window's maximization state.
+  ResetWindowRegion();
+}
+
+void DesktopWindowTreeHostX11::OnFrameExtentsUpdated() {
+  std::vector<int> insets;
+  if (ui::GetIntArrayProperty(xwindow_, "_NET_FRAME_EXTENTS", &insets) &&
+      insets.size() == 4) {
+    // |insets| are returned in the order: [left, right, top, bottom].
+    native_window_frame_borders_ = gfx::Insets(
+        insets[2],
+        insets[0],
+        insets[3],
+        insets[1]);
+  } else {
+    native_window_frame_borders_ = gfx::Insets();
+  }
+}
+
 void DesktopWindowTreeHostX11::SetWMSpecState(bool enabled,
                                                 ::Atom state1,
                                                 ::Atom state2) {
@@ -1205,10 +1282,14 @@ void DesktopWindowTreeHostX11::ResetWindowRegion() {
   // If a custom window shape was supplied then apply it.
   if (custom_window_shape_) {
     XShapeCombineRegion(
-        xdisplay_, xwindow_, ShapeBounding, 0, 0, custom_window_shape_, false);
+        xdisplay_, xwindow_, ShapeBounding, 0, 0, window_shape_, false);
     return;
   }
 
+  if (window_shape_)
+    XDestroyRegion(window_shape_);
+  window_shape_ = NULL;
+
   if (!IsMaximized()) {
     gfx::Path window_mask;
     views::Widget* widget = native_widget_delegate_->AsWidget();
@@ -1217,10 +1298,9 @@ void DesktopWindowTreeHostX11::ResetWindowRegion() {
       // so, use it to define the window shape. If not, fall through.
       widget->non_client_view()->GetWindowMask(bounds_.size(), &window_mask);
       if (window_mask.countPoints() > 0) {
-        Region region = gfx::CreateRegionFromSkPath(window_mask);
+        window_shape_ = gfx::CreateRegionFromSkPath(window_mask);
         XShapeCombineRegion(xdisplay_, xwindow_, ShapeBounding,
-                            0, 0, region, false);
-        XDestroyRegion(region);
+                            0, 0, window_shape_, false);
         return;
       }
     }
@@ -1603,53 +1683,11 @@ uint32_t DesktopWindowTreeHostX11::DispatchEvent(
       break;
     }
     case PropertyNotify: {
-      // Get our new window property state if the WM has told us its changed.
-      ::Atom state = atom_cache_.GetAtom("_NET_WM_STATE");
-
-      std::vector< ::Atom> atom_list;
-      if (xev->xproperty.atom == state &&
-          ui::GetAtomArrayProperty(xwindow_, "_NET_WM_STATE", &atom_list)) {
-        window_properties_.clear();
-        std::copy(atom_list.begin(), atom_list.end(),
-                  inserter(window_properties_, window_properties_.begin()));
-
-        if (!restored_bounds_.IsEmpty() && !IsMaximized()) {
-          // If we have restored bounds, but WM_STATE no longer claims to be
-          // maximized, we should clear our restored bounds.
-          restored_bounds_ = gfx::Rect();
-        } else if (IsMaximized() && restored_bounds_.IsEmpty()) {
-          // The request that we become maximized originated from a different
-          // process. |bounds_| already contains our maximized bounds. Do a
-          // best effort attempt to get restored bounds by setting it to our
-          // previously set bounds (and if we get this wrong, we aren't any
-          // worse off since we'd otherwise be returning our maximized bounds).
-          restored_bounds_ = previous_bounds_;
-        }
-
-        is_fullscreen_ = HasWMSpecProperty("_NET_WM_STATE_FULLSCREEN");
-        is_always_on_top_ = HasWMSpecProperty("_NET_WM_STATE_ABOVE");
-
-        // Now that we have different window properties, we may need to
-        // relayout the window. (The windows code doesn't need this because
-        // their window change is synchronous.)
-        //
-        // TODO(erg): While this does work, there's a quick flash showing the
-        // tabstrip/toolbar/etc. when going into fullscreen mode before hiding
-        // those parts of the UI because we receive the sizing event from the
-        // window manager before we receive the event that changes the
-        // fullscreen state. Unsure what to do about that.
-        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();
-        // Refresh the window's border, which may need to be updated if we have
-        // changed the window's maximization state.
-        ResetWindowRegion();
-      }
+      ::Atom changed_atom = xev->xproperty.atom;
+      if (changed_atom == atom_cache_.GetAtom("_NET_WM_STATE"))
+        OnWMStateUpdated();
+      else if (changed_atom == atom_cache_.GetAtom("_NET_FRAME_EXTENTS"))
+        OnFrameExtentsUpdated();
       break;
     }
     case SelectionNotify: {