Extract locking behaviour from ProcessSingleton.

chrome/browser/first_run/try_chrome_dialog_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_FIRST_RUN_TRY_CHROME_DIALOG_VIEW_H_
 #define CHROME_BROWSER_FIRST_RUN_TRY_CHROME_DIALOG_VIEW_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 40 matching lines @@
 //   | |icon| Google Chrome available                |
 //   |        [o] Try it out (already installed)     |
 //   |        [ ] Don't bug me                       |
 //   | --------------------------------------------- |
 //   | [x] Make it the default browser       [ OK ]  |
 //   +-----------------------------------------------+
 
 class TryChromeDialogView : public views::ButtonListener,
                             public views::LinkListener {
  public:
+  // Receives a handle to the active modal dialog, or NULL when the active
+  // dialog is dismissed.
+  typedef base::Callback<void(gfx::NativeWindow active_dialog)>
+      ActiveModalDialogListener;
+
   enum Result {
     TRY_CHROME,             // Launch chrome right now.
     TRY_CHROME_AS_DEFAULT,  // Launch chrome and make it the default.
     NOT_NOW,                // Don't launch chrome. Exit now.
     UNINSTALL_CHROME,       // Initiate chrome uninstall and exit.
     DIALOG_ERROR,           // An error occurred creating the dialog.
     COUNT
   };
 
   // Shows a modal dialog asking the user to give chrome another try. See
   // above for the possible outcomes of the function. This is an experimental,
   // non-localized dialog.
   // |flavor| can be 0, 1, 2 or 3 and selects what strings to present.
-  // |process_singleton| needs to be valid and it will be locked while
-  // the dialog is shown.
+  // |listener| will be notified when the dialog becomes active and when it is
+  // dismissed.
   // Note that the dialog has no parent and it will position itself in a lower
   // corner of the screen. The dialog does not steal focus and does not have an
   // entry in the taskbar.
-  static Result Show(size_t flavor, ProcessSingleton* process_singleton);
+  static Result Show(size_t flavor, const ActiveModalDialogListener& listener);
 
  private:
   explicit TryChromeDialogView(size_t flavor);
   virtual ~TryChromeDialogView();
 
-  Result ShowModal(ProcessSingleton* process_singleton);
+  Result ShowModal(const ActiveModalDialogListener& listener);
 
   // Returns a screen rectangle that is fit to show the window. In particular
   // it has the following properties: a) is visible and b) is attached to the
   // bottom of the working area. For LTR machines it returns a left side
   // rectangle and for RTL it returns a right side rectangle so that the dialog
   // does not compete with the standar place of the start menu.
   gfx::Rect ComputeWindowPosition(int width, int height, bool is_RTL);
 
   // Create a windows region that looks like a toast of width |w| and height
   // |h|. This is best effort, so we don't care much if the operation fails.
@@ skipping 19 matching lines @@
   views::RadioButton* try_chrome_;
   views::RadioButton* kill_chrome_;
   views::RadioButton* dont_try_chrome_;
   views::Checkbox* make_default_;
   Result result_;
 
   DISALLOW_COPY_AND_ASSIGN(TryChromeDialogView);
 };
 
 #endif  // CHROME_BROWSER_FIRST_RUN_TRY_CHROME_DIALOG_VIEW_H_