WebView: speed up user gesture notification for GestureTap

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1809 matching lines @@
 bool WebViewImpl::hasVerticalScrollbar()
 {
     return mainFrameImpl()->frameView()->verticalScrollbar();
 }
 
 const WebInputEvent* WebViewImpl::m_currentInputEvent = 0;
 
 bool WebViewImpl::handleInputEvent(const WebInputEvent& inputEvent)
 {
     UserGestureNotifier notifier(m_autofillClient, &m_userGestureObserved);
+    // On the first input event since page load, |notifier| instructs the
+    // autofill client to unblock values of password input fields of any forms
+    // on the page. There is a single input event, GestureTap, which can both
+    // be the first event after page load, and cause a form submission. In that
+    // case, the form submission happens before the autofill client is told
+    // to unblock the password values, and so the password values are not
+    // submitted. To avoid that, GestureTap is handled explicitly:
+    if (inputEvent.type == WebInputEvent::GestureTap && m_autofillClient) {
+        m_userGestureObserved = true;
+        m_autofillClient->firstUserGestureObserved();
+    }
 
     TRACE_EVENT0("input", "WebViewImpl::handleInputEvent");
     // If we've started a drag and drop operation, ignore input events until
     // we're done.
     if (m_doingDragAndDrop)
         return true;
 
     if (m_devToolsAgent && m_devToolsAgent->handleInputEvent(m_page.get(), inputEvent))
         return true;
 
@@ skipping 2224 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink