Fix scroll anchoring during viewport resize.

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index deeeb5ead2dc278ae8e8ace7f2a6ba7de082d15a..01c9896a934cb3b59f2c1e2a4b51242aaa210d63 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -58,6 +58,7 @@
 #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"
@@ -773,6 +774,8 @@ private:
     // 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