Add a new constructor to KeyEvent.

views/focus/accelerator_handler.h

Index: views/focus/accelerator_handler.h
===================================================================
--- views/focus/accelerator_handler.h	(revision 74437)
+++ views/focus/accelerator_handler.h	(working copy)
@@ -35,7 +35,14 @@
 // for the window that is receiving these messages for accelerator processing.
 class AcceleratorHandler : public MessageLoopForUI::Dispatcher {
  public:
-   AcceleratorHandler();
+  AcceleratorHandler();
+
+#if defined(OS_WIN)
+  // Returns the message currently being processed.
+  // Note that this may not work for message loops run by the OS.
+  static const MSG& current_message() { return current_messages_->back(); }
+#endif
+
   // Dispatcher method. This returns true if an accelerator was processed by the
   // focus manager
 #if defined(OS_WIN)
@@ -51,6 +58,9 @@
 #if defined(OS_WIN)
   // The keys currently pressed and consumed by the FocusManager.
   std::set<WPARAM> pressed_keys_;
+
+  // A stack of current messages, to handle message loop nesting.
+  static std::vector<MSG>* current_messages_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratorHandler);