Ensure that the OSK does not show up at times when you click on editable fields with the mouse.

content/browser/accessibility/browser_accessibility_manager.cc

 // 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.
 
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 
 #include "base/logging.h"
 #include "content/browser/accessibility/browser_accessibility.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
 #include "content/common/accessibility_messages.h"
@@ skipping 169 matching lines @@
     if (!node) {
       NOTREACHED();
       continue;
     }
 
     int notification_type = param.notification_type;
     if (notification_type == AccessibilityNotificationFocusChanged ||
         notification_type == AccessibilityNotificationBlur) {
       SetFocus(node, false);
 
-      if (osk_state_ != OSK_DISALLOWED_BECAUSE_TAB_HIDDEN)
+      if (osk_state_ != OSK_DISALLOWED_BECAUSE_TAB_HIDDEN &&
+          osk_state_ != OSK_DISALLOWED_BECAUSE_TAB_JUST_APPEARED)
         osk_state_ = OSK_ALLOWED;
 
       // Don't send a native focus event if the window itself doesn't
       // have focus.
       if (delegate_ && !delegate_->HasFocus())
         continue;
     }
 
     // Send the notification event to the operating system.
     NotifyAccessibilityEvent(notification_type, node);
@@ skipping 197 matching lines @@
   // is so that we send a single ObjectShow event for the root of a subtree
   // that just appeared for the first time, but not on any descendant of
   // that subtree.
   if (send_show_events)
     NotifyAccessibilityEvent(AccessibilityNotificationObjectShow, instance);
 
   instance->PostInitialize();
 
   return instance;
 }