Implement cycle window forward/backward by keyboard shortcuts.

ui/aura_shell/shell.cc

Index: ui/aura_shell/shell.cc
diff --git a/ui/aura_shell/shell.cc b/ui/aura_shell/shell.cc
index 406215edf0c8b29e878f604d4eda60f520fb529d..862d497981adff4661f46bedd7d1a419c6cc982e 100644
--- a/ui/aura_shell/shell.cc
+++ b/ui/aura_shell/shell.cc
@@ -4,6 +4,8 @@
 
 #include "ui/aura_shell/shell.h"
 
+#include <algorithm>
+
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "ui/aura/aura_switches.h"
@@ -281,6 +283,31 @@ void Shell::ToggleAppList() {
   app_list_->SetVisible(!app_list_->IsVisible());
 }
 
+// Returns true if the screen is locked.
+bool Shell::IsScreenLocked() const {
+  const aura::Window* lock_screen_container = GetContainer(
+      internal::kShellWindowId_LockScreenContainer);
+  const aura::Window::Windows& lock_screen_windows =
+      lock_screen_container->children();
+  aura::Window::Windows::const_iterator lock_screen_it =
+      std::find_if(lock_screen_windows.begin(), lock_screen_windows.end(),
+                   std::mem_fun(&aura::Window::IsVisible));
+  if (lock_screen_it != lock_screen_windows.end())
+    return true;
+
+  const aura::Window* lock_modal_container = GetContainer(

[Ben Goodger (Google), 2011/12/11 21:54:05]

I don't believe it's possible to return true from this check but not the
previous check.

[mazda, 2011/12/12 04:53:33]

This returns true in the line 240 of shell_unittest.cc in this CL.
Is that an unintended use of the lock modal window?

+      internal::kShellWindowId_LockModalContainer);
+  const aura::Window::Windows& lock_modal_windows =
+      lock_modal_container->children();
+  aura::Window::Windows::const_iterator lock_modal_it =
+      std::find_if(lock_modal_windows.begin(), lock_modal_windows.end(),
+                   std::mem_fun(&aura::Window::IsVisible));
+  if (lock_modal_it != lock_modal_windows.end())
+    return true;
+
+  return false;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, private: