Send early ShowPress on TapDown when page isn't scrollable/pinchable.

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 1089 matching lines @@
 {
     if (!m_page || !m_page->mainFrame())
         return 0;
 
     Node* bestTouchNode = 0;
 
     IntPoint touchEventLocation(tapEvent.position());
     m_page->mainFrame()->eventHandler().adjustGesturePosition(tapEvent, touchEventLocation);
 
     IntPoint hitTestPoint = m_page->mainFrame()->view()->windowToContents(touchEventLocation);
-    HitTestResult result = m_page->mainFrame()->eventHandler().hitTestResultAtPoint(hitTestPoint, HitTestRequest::TouchEvent | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
+    EventHandler& eventHandler = m_page->mainFrame()->eventHandler();
+    HitTestRequest::HitTestRequestType hitType = HitTestRequest::TouchEvent | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent;
+    if (eventHandler.tapDownTriggeredActive())
+        hitType |= HitTestRequest::ReadOnly;

[Rick Byers, 2014/02/14 21:27:53]

Does this normally need to be non-readonly so that active gets triggered for the
disambiguation pop-up?  I had assumed showPress would trigger it in that case
too (or if there's a race, perhaps we should be sending a show press explicitly
before showing the disambiguation window).

Why do you need to make it read only in this case?

+    HitTestResult result = eventHandler.hitTestResultAtPoint(hitTestPoint, hitType);
     bestTouchNode = result.targetNode();
 
     // We might hit something like an image map that has no renderer on it
     // Walk up the tree until we have a node with an attached renderer
     while (bestTouchNode && !bestTouchNode->renderer())
         bestTouchNode = bestTouchNode->parentNode();
 
     // Check if we're in the subtree of a node with a hand cursor
     // this is the heuristic we use to determine if we show a highlight on tap
     while (bestTouchNode && !invokesHandCursor(bestTouchNode, false, m_page->mainFrame()))
@@ skipping 2860 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