Add hittest mode for Touch-action which ignore inline elements and svg elements

Source/core/rendering/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1035 matching lines @@
         LayoutUnit bottom = min(rootBox->lineBottom(), top + logicalHeight);
         top = max(rootBox->lineTop(), top);
         logicalHeight = bottom - top;
     }
 
     // Move x/y to our coordinates.
     LayoutRect rect(minX, minY, width, height);
     flipForWritingMode(rect);
     rect.moveBy(accumulatedOffset);
 
+    if (request.touchAction())
+        return false;
+
     if (visibleToHitTestRequest(request) && locationInContainer.intersects(rect)) {

[gnana, 2014/02/27 13:26:59]

i feel this rect should have been computed from renderer->size(), then the
locationInContainer.intersects(rect) will fail.
But its computed from InlineFlowBox::roundedFrameRect(). I dont understand why
this is done.

I have added a hittestrequest::touchaction check to fix the bug. Now body
element is return for the test case when touch on span element.

<div class='ta-none' style='height: 0; margin-bottom: 50px'>
  <span expected-action='auto'>
    touch-action should not be inherited by inline elements
  </span>
</div>

[Rick Byers, 2014/02/27 14:53:11]

Ah, this makes sense.  The RenderBlock has a bunch of InlineFlowBoxes, and
InlineBox::visibleToHitTestRequest is calling into
RenderBlock::visibleToHitTestRequest here.  I think this is the right thing to
do, except that the touchAction check probably belongs inside of
InlineBox::visibleToHitTestRequest instead of here.  That way any other uses of
InlineBox know that touch-action hit tests are never satisfied by them.

[gnana, 2014/02/28 10:04:25]

Moved the change to InlineBox
Done.

         renderer()->updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - toLayoutSize(accumulatedOffset))); // Don't add in m_x or m_y here, we want coords in the containing block's space.
         if (!result.addNodeToRectBasedTestResult(renderer()->node(), request, locationInContainer, rect))
             return true;
     }
 
     return false;
 }
 
 void InlineFlowBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
 {
@@ skipping 567 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace WebCore