Reset VisualViewport position after same page navigation

third_party/WebKit/Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1820 matching lines @@
 String Internals::pageSizeAndMarginsInPixels(int pageNumber, int width, int height, int marginTop, int marginRight, int marginBottom, int marginLeft, ExceptionState& exceptionState) const
 {
     if (!frame()) {
         exceptionState.throwDOMException(InvalidAccessError, "No frame is available.");
         return String();
     }
 
     return PrintContext::pageSizeAndMarginsInPixels(frame(), pageNumber, width, height, marginTop, marginRight, marginBottom, marginLeft);
 }
 
+float Internals::pageScaleFactor(ExceptionState& exceptionState)
+{
+    Document* document = contextDocument();
+    if (!document || !document->page()) {
+        exceptionState.throwDOMException(InvalidAccessError, document ? "The document's page cannot be retrieved." : "No context document can be obtained.");
+        return 0;
+    }
+    Page* page = document->page();
+    return page->frameHost().visualViewport().pageScale();
+}
+
 void Internals::setPageScaleFactor(float scaleFactor, ExceptionState& exceptionState)
 {
     Document* document = contextDocument();
     if (!document || !document->page()) {
         exceptionState.throwDOMException(InvalidAccessError, document ? "The document's page cannot be retrieved." : "No context document can be obtained.");
         return;
     }
     Page* page = document->page();
     page->frameHost().visualViewport().setScale(scaleFactor);
 }
@@ skipping 776 matching lines @@
 
     return ClientRect::create(FloatRect(node->layoutObject()->visualRect()));
 }
 
 void Internals::crash()
 {
     CHECK(false) << "Intentional crash";
 }
 
 } // namespace blink