Fix scroll anchoring during viewport resize.

third_party/WebKit/Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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 40 matching lines @@
 #include "public/platform/WebVector.h"
 #include "public/web/WebInputEvent.h"
 #include "public/web/WebNavigationPolicy.h"
 #include "public/web/WebPageImportanceSignals.h"
 #include "public/web/WebView.h"
 #include "web/ChromeClientImpl.h"
 #include "web/ContextMenuClientImpl.h"
 #include "web/EditorClientImpl.h"
 #include "web/MediaKeysClientImpl.h"
 #include "web/PageWidgetDelegate.h"
+#include "web/ResizeViewportAnchor.h"
 #include "web/SpellCheckerClientImpl.h"
 #include "web/StorageClientImpl.h"
 #include "web/WebExport.h"
 #include "wtf/Compiler.h"
 #include "wtf/HashSet.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 #include <memory>
 
 namespace blink {
@@ skipping 695 matching lines @@
     // Manages the layer tree created for this page in Slimming Paint v2.
     PaintArtifactCompositor m_paintArtifactCompositor;
 
     double m_lastFrameTimeMonotonic;
 
     // TODO(lfg): This is used in order to disable compositor visibility while
     // the page is still visible. This is needed until the WebView and WebWidget
     // split is complete, since in out-of-process iframes the page can be
     // visible, but the WebView should not be used as a widget.
     bool m_overrideCompositorVisibility;
+
+    Persistent<ResizeViewportAnchor> m_resizeViewportAnchor;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif