Send an EVENT_SYSTEM_ALERT when a user first places focus within an infobar.

chrome/browser/views/infobars/infobars.cc

Index: chrome/browser/views/infobars/infobars.cc
===================================================================
--- chrome/browser/views/infobars/infobars.cc	(revision 60474)
+++ chrome/browser/views/infobars/infobars.cc	(working copy)
@@ -185,6 +185,15 @@
   }
 }
 
+// InfoBar, views::FocusChangeListener implementation: ------------------
+
+void InfoBar::FocusWillChange(View* focused_before, View* focused_now) {
+  if (focused_before && focused_now &&
+      !this->IsParentOf(focused_before) && this->IsParentOf(focused_now)) {
+    NotifyAccessibilityEvent(AccessibilityTypes::EVENT_ALERT);
+  }
+}
+
 // InfoBar, AnimationDelegate implementation: ----------------------------------
 
 void InfoBar::AnimationProgressed(const Animation* animation) {
@@ -254,6 +263,9 @@
   }
 #endif
 
+  if (GetFocusManager())
+    GetFocusManager()->AddFocusChangeListener(this);
+
   NotifyAccessibilityEvent(AccessibilityTypes::EVENT_ALERT);
 }
 
@@ -267,6 +279,9 @@
   // since no-one refers to us now.
   MessageLoop::current()->PostTask(FROM_HERE,
       delete_factory_.NewRunnableMethod(&InfoBar::DeleteSelf));
+
+  if (GetFocusManager())
+    GetFocusManager()->RemoveFocusChangeListener(this);
 }
 
 void InfoBar::DestroyFocusTracker(bool restore_focus) {