API proposal for chrome.app.window to intercept all keys.

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index 9d1861e41db23fb1956fcc03e03065064455200c..e2e25e82555fdc20e9389db54bab7f14c907d41b 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -259,6 +259,7 @@ DesktopNativeWidgetAura::DesktopNativeWidgetAura(
       last_drop_operation_(ui::DragDropTypes::DRAG_NONE),
       restore_focus_on_activate_(false),
       restore_focus_on_window_focus_(false),
+      intercept_all_keys_on_focus_(false),
       cursor_(gfx::kNullCursor),
       widget_type_(Widget::InitParams::TYPE_WINDOW) {
   aura::client::SetFocusChangeObserver(content_window_, this);
@@ -813,6 +814,14 @@ void DesktopNativeWidgetAura::SetVisibleOnAllWorkspaces(bool always_visible) {
     desktop_window_tree_host_->SetVisibleOnAllWorkspaces(always_visible);
 }
 
+void DesktopNativeWidgetAura::SetInterceptAllKeys(bool want_all_keys) {
+  // Enable immediately if the window is active.
+  if (IsActive()) {
+    desktop_window_tree_host_->SetInterceptAllKeys(want_all_keys);
+  }
+  intercept_all_keys_on_focus_ = want_all_keys;
+}
+
 void DesktopNativeWidgetAura::Maximize() {
   if (content_window_)
     desktop_window_tree_host_->Maximize();
@@ -1074,6 +1083,12 @@ bool DesktopNativeWidgetAura::ShouldActivate() const {
 void DesktopNativeWidgetAura::OnWindowActivated(aura::Window* gained_active,
                                                 aura::Window* lost_active) {
   DCHECK(content_window_ == gained_active || content_window_ == lost_active);
+
+  if (intercept_all_keys_on_focus_) {
+    desktop_window_tree_host_->SetInterceptAllKeys(gained_active ==
+                                                   content_window_);
+  }
+
   if (gained_active == content_window_ && restore_focus_on_activate_) {
     restore_focus_on_activate_ = false;
     GetWidget()->GetFocusManager()->RestoreFocusedView();