Rewrite release event only if press event was rewritten for a given device.

chrome/browser/ui/ash/event_rewriter.h

Index: chrome/browser/ui/ash/event_rewriter.h
diff --git a/chrome/browser/ui/ash/event_rewriter.h b/chrome/browser/ui/ash/event_rewriter.h
index 68ef9180f65596ee3ca5331c71a37d924bbca0f5..f08507582a83135d4e6027e22b6762f449777bf4 100644
--- a/chrome/browser/ui/ash/event_rewriter.h
+++ b/chrome/browser/ui/ash/event_rewriter.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_UI_ASH_EVENT_REWRITER_H_
 
 #include <map>
+#include <set>
 #include <string>
 
 #include "ash/event_rewriter_delegate.h"
@@ -78,6 +79,7 @@ class EventRewriter : public ash::EventRewriterDelegate,
 
  private:
   friend class EventRewriterAshTest;
+  friend class EventRewriterTest;
 
   // ash::EventRewriterDelegate overrides:
   virtual ash::EventRewriterDelegate::Action RewriteOrFilterKeyEvent(
@@ -223,6 +225,9 @@ class EventRewriter : public ash::EventRewriterDelegate,
   // A mapping from X11 KeySym keys to KeyCode values.
   base::hash_map<unsigned long, unsigned long> keysym_to_keycode_map_;
 
+  // A set of device IDs whose press event has been rewritten.
+  std::set<int> pressed_device_ids_;
+
   chromeos::input_method::XKeyboard* xkeyboard_for_testing_;
 
   scoped_ptr<chromeos::KeyboardDrivenEventRewriter>