Add multiple selection support to chooser on desktops

chrome/browser/chooser_controller/chooser_controller.h

 // Copyright 2016 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_CHOOSER_CONTROLLER_CHOOSER_CONTROLLER_H_
 #define CHROME_BROWSER_CHOOSER_CONTROLLER_CHOOSER_CONTROLLER_H_
 
+#include <vector>
+
 #include "base/macros.h"
 #include "base/strings/string16.h"
 
 namespace content {
 class RenderFrameHost;
 }
 
 // Subclass ChooserController to implement a chooser, which has some
 // introductory text and a list of options that users can pick one of.
 // Your subclass must define the set of options users can pick from;
@@ skipping 41 matching lines @@
     virtual ~View() {}
   };
 
   // Returns the text to be displayed in the chooser title.
   base::string16 GetTitle() const;
 
   // Returns if the chooser needs to show an icon before the text.
   // For WebBluetooth, it is a signal strength icon.
   virtual bool ShouldShowIconBeforeText() const;
 
+  // Returns if the chooser allows multiple items to be selected.
+  virtual bool AllowMultipleSelection() const;
+
   // Returns the text to be displayed in the chooser when there are no options.
   virtual base::string16 GetNoOptionsText() const = 0;
 
   // Returns the label for OK button.
   virtual base::string16 GetOkButtonLabel() const = 0;
 
   // The number of options users can pick from. For example, it can be
   // the number of USB/Bluetooth device names which are listed in the
   // chooser so that users can grant permission.
   virtual size_t NumOptions() const = 0;
@@ skipping 15 matching lines @@
   virtual bool IsPaired(size_t index) const;
 
   // Refresh the list of options.
   virtual void RefreshOptions() = 0;
 
   // Returns the status text to be shown in the chooser.
   virtual base::string16 GetStatus() const = 0;
 
   // These three functions are called just before this object is destroyed:
 
-  // Called when the user selects the |index|th element from the dialog.
-  virtual void Select(size_t index) = 0;
+  // Called when the user selects elements from the dialog. |indices| contains
+  // the indices of the selected elements.
+  virtual void Select(const std::vector<size_t>& indices) = 0;
 
   // Called when the user presses the 'Cancel' button in the dialog.
   virtual void Cancel() = 0;
 
   // Called when the user clicks outside the dialog or the dialog otherwise
   // closes without the user taking an explicit action.
   virtual void Close() = 0;
 
   // Open help center URL.
   virtual void OpenHelpCenterUrl() const = 0;
 
   // Provide help information when the adapter is off.
   virtual void OpenAdapterOffHelpUrl() const;
 
   // Only one view may be registered at a time.
   void set_view(View* view) { view_ = view; }
   View* view() const { return view_; }
 
  private:
   content::RenderFrameHost* const owning_frame_;
   const int title_string_id_origin_;
   const int title_string_id_extension_;
   View* view_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(ChooserController);
 };
 
 #endif  // CHROME_BROWSER_CHOOSER_CONTROLLER_CHOOSER_CONTROLLER_H_