Lock rotation when screen is manually rotated.

ash/shell.h

 // Copyright (c) 2012 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.
 
 #ifndef ASH_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 314 matching lines @@
   // Adds/removes observer.
   void AddShellObserver(ShellObserver* observer);
   void RemoveShellObserver(ShellObserver* observer);
 
   // Turn the always maximize mode window manager on or off.
   void EnableMaximizeModeWindowManager(bool enable);
 
   // Test if the MaximizeModeWindowManager is enabled or not.
   bool IsMaximizeModeWindowManagerEnabled();
 
+#if defined(OS_CHROMEOS)
+  // Test if MaximizeModeWindowManager is not enabled, and if
+  // MaximizeModeController is not currently setting a display rotation. Or if
+  // the |resolution_notification_controller_| is not showing its confirmation
+  // dialog. If true then changes to display settings can be saved.
+  bool ShouldSaveDisplaySettings();
+#endif
+
   AcceleratorController* accelerator_controller() {
     return accelerator_controller_.get();
   }
 
   DisplayManager* display_manager() { return display_manager_.get(); }
   ::wm::InputMethodEventFilter* input_method_filter() {
     return input_method_filter_.get();
   }
   ::wm::CompoundEventFilter* env_filter() {
     return env_filter_.get();
@@ skipping 407 matching lines @@
 
   // Injected content::GPUDataManager support.
   scoped_ptr<GPUSupport> gpu_support_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_