Don't track mouse events in HWNDMessageHandler when they are forwarded by the LegacyRenderWidgetHost

content/browser/renderer_host/legacy_render_widget_host_win.h

Index: content/browser/renderer_host/legacy_render_widget_host_win.h
===================================================================
--- content/browser/renderer_host/legacy_render_widget_host_win.h	(revision 250790)
+++ content/browser/renderer_host/legacy_render_widget_host_win.h	(working copy)
@@ -67,6 +67,7 @@
     MESSAGE_HANDLER_EX(WM_NCPAINT, OnNCPaint)
     MESSAGE_HANDLER_EX(WM_ERASEBKGND, OnEraseBkGnd)
     MESSAGE_RANGE_HANDLER(WM_MOUSEFIRST, WM_MOUSELAST, OnMouseRange)
+    MESSAGE_HANDLER_EX(WM_MOUSELEAVE, OnMouseLeave)
     MESSAGE_HANDLER_EX(WM_MOUSEACTIVATE, OnMouseActivate)
     MESSAGE_HANDLER_EX(WM_SETCURSOR, OnSetCursor)
     MESSAGE_HANDLER_EX(WM_TOUCH, OnTouch)
@@ -107,6 +108,7 @@
   LRESULT OnGetObject(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnKeyboardRange(UINT message, WPARAM w_param, LPARAM l_param,
                           BOOL& handled);
+  LRESULT OnMouseLeave(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnMouseRange(UINT message, WPARAM w_param, LPARAM l_param,
                        BOOL& handled);
   LRESULT OnMouseActivate(UINT message, WPARAM w_param, LPARAM l_param);
@@ -119,6 +121,9 @@
   content::BrowserAccessibilityManagerWin* manager_;
   base::win::ScopedComPtr<IAccessible> window_accessible_;
 
+  // Set to true if we turned on mouse tracking.
+  bool mouse_tracking_enabled_;
+
   DISALLOW_COPY_AND_ASSIGN(LegacyRenderWidgetHostHWND);
 };