More NativeWidget -> Widget notifications: visibility, minimize.

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index 560f533009df6cd8efb4132130a2ed2640e7074a..91d4ff642d656e65f71afe42a652113c3a5fb6cb 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -25,7 +25,8 @@ BridgedNativeWidget::BridgedNativeWidget(NativeWidgetMac* parent)
     : native_widget_mac_(parent),
       focus_manager_(NULL),
       target_fullscreen_state_(false),
-      in_fullscreen_transition_(false) {
+      in_fullscreen_transition_(false),
+      window_visible_(false) {
   DCHECK(parent);
   window_delegate_.reset(
       [[ViewsNSWindowDelegate alloc] initWithBridgedNativeWidget:this]);
@@ -50,6 +51,18 @@ void BridgedNativeWidget::Init(base::scoped_nsobject<NSWindow> window,
   window_.swap(window);
   [window_ setDelegate:window_delegate_];
 
+  // Register for application hide notifications so that visibility can be
+  // properly tracked. This is not done in the delegate so that the lifetime is
+  // tied to the C++ object, rather than the delegate (which may be reference
+  // counted). This is required since the application hides do not send an
+  // orderOut: to individual windows. Unhide, however, does send an order
+  // message.
+  [[NSNotificationCenter defaultCenter]
+      addObserver:window_delegate_
+         selector:@selector(onWindowOrderChanged:)
+             name:NSApplicationDidHideNotification
+           object:nil];
+
   // Validate the window's initial state, otherwise the bridge's initial
   // tracking state will be incorrect.
   DCHECK(![window_ isVisible]);
@@ -97,6 +110,7 @@ void BridgedNativeWidget::SetRootView(views::View* view) {
 void BridgedNativeWidget::OnWindowWillClose() {
   [[window_ parentWindow] removeChildWindow:window_];
   [window_ setDelegate:nil];
+  [[NSNotificationCenter defaultCenter] removeObserver:window_delegate_];
   native_widget_mac_->OnWindowWillClose();
 }
 
@@ -155,6 +169,15 @@ void BridgedNativeWidget::ToggleDesiredFullscreenState() {
   [window_ setCollectionBehavior:behavior];
 }
 
+void BridgedNativeWidget::OnVisibilityChanged() {
+  if (window_visible_ == [window_ isVisible])
+    return;
+
+  window_visible_ = [window_ isVisible];
+  native_widget_mac_->GetWidget()->OnNativeWidgetVisibilityChanged(
+      window_visible_);
+}
+
 InputMethod* BridgedNativeWidget::CreateInputMethod() {
   if (switches::IsTextInputFocusManagerEnabled())
     return new NullInputMethod();