Add Browser::SkipCallBeforeUnload so that the browser windows can be closed regardless of beforeunl…

chrome/browser/ui/browser.h

Index: chrome/browser/ui/browser.h
diff --git a/chrome/browser/ui/browser.h b/chrome/browser/ui/browser.h
index cd6244a52a458cbb5b432b05a1942619d9021894..fb009d2fd22e53d59589291c4c2de569950c75cb 100644
--- a/chrome/browser/ui/browser.h
+++ b/chrome/browser/ui/browser.h
@@ -324,25 +324,30 @@ class Browser : public TabStripModelObserver,
 
   // Gives beforeunload handlers the chance to cancel the close. Returns whether
   // to proceed with the close. If called while the process begun by
-  // CallBeforeUnloadHandlers is in progress, returns false without taking
-  // action.
+  // TryToCloseWindow is in progress, returns false without taking action.
   bool ShouldCloseWindow();
 
   // Begins the process of confirming whether the associated browser can be
   // closed. If there are no tabs with beforeunload handlers it will immediately
-  // return false. Otherwise, it starts prompting the user, returns true and
-  // will call |on_close_confirmed| with the result of the user's decision.
+  // return false. If |skip_beforeunload| is true, all beforeunload
+  // handlers will be skipped and window closing will be confirmed without
+  // showing the prompt, the function will return false as well.
+  // Otherwise, it starts prompting the user, returns true and will call
+  // |on_close_confirmed| with the result of the user's decision.
   // After calling this function, if the window will not be closed, call
   // ResetBeforeUnloadHandlers() to reset all beforeunload handlers; calling
   // this function multiple times without an intervening call to
-  // ResetBeforeUnloadHandlers() will run only the beforeunload handlers
+  // ResetTryToCloseWindow() will run only the beforeunload handlers
   // registered since the previous call.
-  bool CallBeforeUnloadHandlers(
-      const base::Callback<void(bool)>& on_close_confirmed);
+  // Note that if the browser window has been used before, users should always
+  // have a chance to save their work before the window is closed without
+  // triggering beforeunload event.
+  bool TryToCloseWindow(bool skip_beforeunload,
+                        const base::Callback<void(bool)>& on_close_confirmed);
 
   // Clears the results of any beforeunload confirmation dialogs triggered by a
-  // CallBeforeUnloadHandlers call.
-  void ResetBeforeUnloadHandlers();
+  // TryToCloseWindow call.
+  void ResetTryToCloseWindow();
 
   // Figure out if there are tabs that have beforeunload handlers.
   // It starts beforeunload/unload processing as a side-effect.