Use expected main frame size from WebViewImpl when creating a new FrameView.

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 3192 matching lines @@
     if (ignore) {
         constraints.minimumScale = m_pageScaleConstraintsSet.defaultConstraints().minimumScale;
         constraints.maximumScale = m_pageScaleConstraintsSet.defaultConstraints().maximumScale;
     } else {
         constraints.minimumScale = -1;
         constraints.maximumScale = -1;
     }
     setUserAgentPageScaleConstraints(constraints);
 }
 
+IntSize WebViewImpl::mainFrameSize()
+{
+    if (!pinchVirtualViewportEnabled() || !localFrameRootTemporary())
+        return m_size;
+
+    FrameView* view = localFrameRootTemporary()->frameView();
+
+    if (!view)
+        return m_size;
+
+    int contentAndScrollbarWidth = contentsSize().width();
+
+    if (view && view->verticalScrollbar() && !view->verticalScrollbar()->isOverlayScrollbar())
+        contentAndScrollbarWidth += view->verticalScrollbar()->width();
+
+    return m_pageScaleConstraintsSet.mainFrameSize(contentAndScrollbarWidth);
+}
+
 void WebViewImpl::refreshPageScaleFactorAfterLayout()
 {
     if (!mainFrame() || !page() || !page()->mainFrame() || !page()->mainFrame()->isLocalFrame() || !page()->deprecatedLocalMainFrame()->view())
         return;
     FrameView* view = page()->deprecatedLocalMainFrame()->view();
 
     updatePageDefinedViewportConstraints(mainFrameImpl()->frame()->document()->viewportDescription());
     m_pageScaleConstraintsSet.computeFinalConstraints();
 
     if (settings()->shrinksViewportContentToFit()) {
         int verticalScrollbarWidth = 0;
         if (view->verticalScrollbar() && !view->verticalScrollbar()->isOverlayScrollbar())
             verticalScrollbarWidth = view->verticalScrollbar()->width();
         m_pageScaleConstraintsSet.adjustFinalConstraintsToContentsSize(contentsSize(), verticalScrollbarWidth);
     }
 
-    if (pinchVirtualViewportEnabled()) {
-        int contentAndScrollbarWidth = contentsSize().width();
-        if (view->verticalScrollbar() && !view->verticalScrollbar()->isOverlayScrollbar())
-            contentAndScrollbarWidth += view->verticalScrollbar()->width();
-
-        view->resize(m_pageScaleConstraintsSet.mainFrameSize(contentAndScrollbarWidth));
-    }
+    if (pinchVirtualViewportEnabled())
+        view->resize(mainFrameSize());
 
     float newPageScaleFactor = pageScaleFactor();
     if (m_pageScaleConstraintsSet.needsReset() && m_pageScaleConstraintsSet.finalConstraints().initialScale != -1) {
         newPageScaleFactor = m_pageScaleConstraintsSet.finalConstraints().initialScale;
         m_pageScaleConstraintsSet.setNeedsReset(false);
     }
     setPageScaleFactor(newPageScaleFactor);
 
     updateLayerTreeViewport();
 
@@ skipping 1254 matching lines @@
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 void WebViewImpl::forceNextWebGLContextCreationToFail()
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 } // namespace blink