Preserve page resize information when main frame is remote

third_party/WebKit/Source/core/frame/VisualViewport.cpp

 /*
  * Copyright (C) 2013 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 71 matching lines @@
 }
 
 DEFINE_TRACE(VisualViewport)
 {
     visitor->trace(m_frameHost);
     ScrollableArea::trace(visitor);
 }
 
 void VisualViewport::setSize(const IntSize& size)
 {
-    // When the main frame is remote, we won't have an associated frame.
-    if (!mainFrame())
-        return;
-
     if (m_size == size)
         return;
 
-    bool autosizerNeedsUpdating =
-        (size.width() != m_size.width())
-        && mainFrame()->settings()
-        && mainFrame()->settings()->textAutosizingEnabled();
-
     TRACE_EVENT2("blink", "VisualViewport::setSize", "width", size.width(), "height", size.height());
+    bool widthDidChange = size.width() != m_size.width();
     m_size = size;
 
     if (m_innerViewportContainerLayer) {
         m_innerViewportContainerLayer->setSize(FloatSize(m_size));
 
         // Need to re-compute sizes for the overlay scrollbars.
         initializeScrollbars();
     }
 
+    if (!mainFrame())
+        return;
+
+    bool autosizerNeedsUpdating = widthDidChange
+        && mainFrame()->settings()
+        && mainFrame()->settings()->textAutosizingEnabled();
+
     if (autosizerNeedsUpdating) {
         // This needs to happen after setting the m_size member since it'll be read in the update call.
         if (TextAutosizer* textAutosizer = mainFrame()->document()->textAutosizer())
             textAutosizer->updatePageInfoInAllFrames();
     }
 }
 
 void VisualViewport::reset()
 {
     setScaleAndLocation(1, FloatPoint());
@@ skipping 615 matching lines @@
     } else if (graphicsLayer == m_rootTransformLayer) {
         name =  "Root Transform Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink