Experimental Extension Keybinding (first cut).

ui/views/focus/focus_manager.h

Index: ui/views/focus/focus_manager.h
===================================================================
--- ui/views/focus/focus_manager.h	(revision 122745)
+++ ui/views/focus/focus_manager.h	(working copy)
@@ -189,6 +189,14 @@
   // Register a keyboard accelerator for the specified target. If multiple
   // targets are registered for an accelerator, a target registered later has
   // higher priority.
+  // |accelerator| is the accelerator to register.
+  // |priority| denotes whether the |target| is a priority handler or not.
+  // NOTE: In almost all cases, you should specify |false| for this parameter.
+  // Setting it to |true| prevents Chrome from sending the shortcut to the
+  // webpage if the renderer has focus, which is not desirable except for
+  // isolated cases.
+  // |target| is the AcceleratorTarget that handles the event once the
+  // accelerator is pressed.
   // Note that we are currently limited to accelerators that are either:
   // - a key combination including Ctrl or Alt
   // - the escape key
@@ -196,6 +204,7 @@
   // - any F key (F1, F2, F3 ...)
   // - any browser specific keys (as available on special keyboards)
   void RegisterAccelerator(const ui::Accelerator& accelerator,
+                           bool priority,
                            ui::AcceleratorTarget* target);
 
   // Unregister the specified keyboard accelerator for the specified target.
@@ -239,6 +248,9 @@
   ui::AcceleratorTarget* GetCurrentTargetForAccelerator(
       const ui::Accelerator& accelertor) const;
 
+  // Whether the given |accelerator| has a priority handler associated with it.
+  bool HasPriorityHandler(const ui::Accelerator& accelerator) const;
+
   // Clears the native view having the focus.
   virtual void ClearNativeFocus();