Indicate user gesture for mouse down/up while pointer locked.

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 663 matching lines @@
     // Whether the webview is rendering transparently.
     bool m_isTransparent;
 
     // Whether the user can press tab to focus links.
     bool m_tabsToLinks;
 
     // If set, the (plugin) node which has mouse capture.
     RefPtrWillBePersistent<Node> m_mouseCaptureNode;
     RefPtr<UserGestureToken> m_mouseCaptureGestureToken;
 
+    RefPtr<UserGestureToken> m_pointerLockGestureToken;
+
     IntRect m_rootLayerScrollDamage;
     WebLayerTreeView* m_layerTreeView;
     WebLayer* m_rootLayer;
     GraphicsLayer* m_rootGraphicsLayer;
     GraphicsLayer* m_rootTransformLayer;
     OwnPtr<GraphicsLayerFactory> m_graphicsLayerFactory;
     bool m_isAcceleratedCompositingActive;
     bool m_layerTreeViewCommitsDeferred;
     bool m_layerTreeViewClosed;
     bool m_matchesHeuristicsForGpuRasterization;
@@ skipping 22 matching lines @@
     bool m_userGestureObserved;
 };
 
 // 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