Made top controls work with virtual viewport pinch-to-zoom. (Blink)

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 1698 matching lines @@
     m_topControlsLayoutHeight = height;
     didUpdateTopControls();
 }
 
 void WebViewImpl::didUpdateTopControls()
 {
     FrameView* view = localFrameRootTemporary()->frameView();
     if (!view)
         return;
 
-    // The viewport bounds were adjusted on the compositor by this much due to top controls. Tell
-    // the FrameView about it so it can make correct scroll offset clamping decisions during compositor
-    // commits.
-    float topControlsViewportAdjustment = m_topControlsContentOffset - m_topControlsLayoutHeight;
-    view->setTopControlsViewportAdjustment(topControlsViewportAdjustment);
+    float topControlsViewportAdjustment = m_topControlsLayoutHeight - m_topControlsContentOffset;
+    if (!pinchVirtualViewportEnabled()) {
+        // The viewport bounds were adjusted on the compositor by this much due to top controls. Tell
+        // the FrameView about it so it can make correct scroll offset clamping decisions during compositor
+        // commits.
+        view->setTopControlsViewportAdjustment(topControlsViewportAdjustment);
+    } else {
+        PinchViewport& pinchViewport = page()->frameHost().pinchViewport();
+        pinchViewport.setTopControlsAdjustment(topControlsViewportAdjustment);
+
+        // Shrink the FrameView by the amount that will maintain the aspect-ratio with the PinchViewport.
+        float aspectRatio = pinchViewport.visibleRect().width() / pinchViewport.visibleRect().height();
+        float newHeight = view->unscaledVisibleContentSize(ExcludeScrollbars).width() / aspectRatio;
+        float adjustment = newHeight - view->unscaledVisibleContentSize(ExcludeScrollbars).height();
+        view->setTopControlsViewportAdjustment(adjustment);
+    }
 }
 
 void WebViewImpl::resize(const WebSize& newSize)
 {
     if (m_shouldAutoResize || m_size == newSize)
         return;
 
     FrameView* view = localFrameRootTemporary()->frameView();
     if (!view)
         return;
@@ skipping 2710 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