Carry out a resize even if no layout has been performed.

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 1804 matching lines @@
         performResize();
     }
 
     m_fullscreenController->updateSize();
 
     if (settings()->viewportEnabled()) {
         PinchViewport& pinchViewport = page()->frameHost().pinchViewport();
         FloatPoint viewportOffsetBeforeResize = pinchViewport.visibleRectInDocument().location();
 
         // Relayout immediately to recalculate the minimum scale limit.
-        if (view->needsLayout())
+        if (view->needsLayout() || (page()->settings().forceZeroLayoutHeight() && pinchVirtualViewportEnabled()))

[hush (inactive), 2015/02/10 18:21:04]

I think the initial purpose for forceZeroLayoutHeight is to make needsLayout()
false here...
See mkosiba's initial code review here:
https://codereview.chromium.org/453893002/diff/1/Source/web/tests/WebFrameTes...

[aelias_OOO_until_Jul13, 2015/02/10 21:16:57]

No, the initial purpose is to avoid weird layout infinite loops between the
Android View system and Blink, as I understand it.  The absence of needsLayout
was a minor side effect I think.

             view->layout();
 
         if (shouldAnchorAndRescaleViewport) {
             float newPageScaleFactor = oldPageScaleFactor / oldMinimumPageScaleFactor * minimumPageScaleFactor();
             newPageScaleFactor = clampPageScaleFactorToLimits(newPageScaleFactor);
 
             FloatSize pinchViewportSize = FloatSize(newSize);
             pinchViewportSize.scale(1 / newPageScaleFactor);
 
             IntPoint mainFrameOrigin;
@@ skipping 2788 matching lines @@
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 void WebViewImpl::forceNextWebGLContextCreationToFail()
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 } // namespace blink