Close tooltip for |title| attribute on any keyboard event.

third_party/WebKit/Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 104 matching lines @@
 // Converts a AXObjectCache::AXNotification to a WebAXEvent
 static WebAXEvent toWebAXEvent(AXObjectCache::AXNotification notification)
 {
     // These enums have the same values; enforced in AssertMatchingEnums.cpp.
     return static_cast<WebAXEvent>(notification);
 }
 
 ChromeClientImpl::ChromeClientImpl(WebViewImpl* webView)
     : m_webView(webView)
     , m_cursorOverridden(false)
+    , m_didRequestNonEmptyToolTip(false)
 {
 }
 
 ChromeClientImpl::~ChromeClientImpl()
 {
 }
 
 PassOwnPtrWillBeRawPtr<ChromeClientImpl> ChromeClientImpl::create(WebViewImpl* webView)
 {
     return adoptPtrWillBeNoop(new ChromeClientImpl(webView));
@@ skipping 434 matching lines @@
                 url = plugin->plugin()->linkAtPosition(result.roundedPointInInnerNodeFrame());
             }
         }
     }
 
     m_webView->client()->setMouseOverURL(url);
 }
 
 void ChromeClientImpl::setToolTip(const String& tooltipText, TextDirection dir)
 {
-    if (m_webView->client())
+    if (!m_webView->client())
+        return;
+    if (!tooltipText.isEmpty()) {
         m_webView->client()->setToolTipText(tooltipText, toWebTextDirection(dir));
+        m_didRequestNonEmptyToolTip = true;
+    } else if (m_didRequestNonEmptyToolTip) {
+        // WebViewClient::setToolTipText will send an IPC message.  We'd like to
+        // reduce the number of setToolTipText calls.
+        m_webView->client()->setToolTipText(tooltipText, toWebTextDirection(dir));
+        m_didRequestNonEmptyToolTip = false;
+    }
 }
 
 void ChromeClientImpl::dispatchViewportPropertiesDidChange(const ViewportDescription& description) const
 {
     m_webView->updatePageDefinedViewportConstraints(description);
 }
 
 void ChromeClientImpl::printDelegate(LocalFrame* frame)
 {
     if (m_webView->client())
@@ skipping 418 matching lines @@
     if (m_webView->pageImportanceSignals())
         m_webView->pageImportanceSignals()->setIssuedNonGetFetchFromScript();
 }
 
 PassOwnPtr<WebFrameScheduler> ChromeClientImpl::createFrameScheduler()
 {
     return m_webView->scheduler()->createFrameScheduler().release();
 }
 
 } // namespace blink