Add DidSaveScrollOrScaleState flag to prevent restoreScrollPositionAndViewState restore from default

third_party/WebKit/Source/web/tests/VisualViewportTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/VisualViewport.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/BrowserControls.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
@@ skipping 909 matching lines @@
   webViewImpl()->resize(IntSize(200, 300));
 
   registerMockedHttpURLLoad("200-by-300.html");
 
   WebHistoryItem item;
   item.initialize();
   WebURL destinationURL(URLTestHelpers::toKURL(m_baseURL + "200-by-300.html"));
   item.setURLString(destinationURL.string());
   item.setVisualViewportScrollOffset(WebFloatPoint(100, 120));
   item.setPageScaleFactor(2);
+  item.setDidSaveScrollOrScaleState(true);

[majidvp, 2017/02/15 17:37:32]

and here.

 
   FrameTestHelpers::loadHistoryItem(webViewImpl()->mainFrame(), item,
                                     WebHistoryDifferentDocumentLoad,
                                     WebCachePolicy::UseProtocolCachePolicy);
 
   VisualViewport& visualViewport =
       frame()->page()->frameHost().visualViewport();
   EXPECT_EQ(2, visualViewport.scale());
 
   EXPECT_FLOAT_POINT_EQ(FloatPoint(100, 120),
@@ skipping 12 matching lines @@
   WebHistoryItem item;
   item.initialize();
   WebURL destinationURL(
       URLTestHelpers::toKURL(m_baseURL + "200-by-300-viewport.html"));
   item.setURLString(destinationURL.string());
   // (-1, -1) will be used if the HistoryItem is an older version prior to
   // having visual viewport scroll offset.
   item.setVisualViewportScrollOffset(WebFloatPoint(-1, -1));
   item.setScrollOffset(WebPoint(120, 180));
   item.setPageScaleFactor(2);
+  item.setDidSaveScrollOrScaleState(true);

[majidvp, 2017/02/15 17:37:32]

and here.

 
   FrameTestHelpers::loadHistoryItem(webViewImpl()->mainFrame(), item,
                                     WebHistoryDifferentDocumentLoad,
                                     WebCachePolicy::UseProtocolCachePolicy);
 
   VisualViewport& visualViewport =
       frame()->page()->frameHost().visualViewport();
   EXPECT_EQ(2, visualViewport.scale());
   EXPECT_SIZE_EQ(
       ScrollOffset(100, 150),
@@ skipping 1500 matching lines @@
                                    "  body {"
                                    "    margin: 0px;"
                                    "  }"
                                    "  div { height:110vh; width: 110vw; }"
                                    "</style>"
                                    "<div></div>",
                                    baseURL);
 }
 
 }  // namespace