Register and select printer on click.

chrome/browser/ui/webui/print_preview/print_preview_handler.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_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 128 matching lines @@
   // |args| is unused.
   void HandleHidePreview(const base::ListValue* args);
 
   // Handles the request to cancel the pending print request. |args| is unused.
   void HandleCancelPendingPrintRequest(const base::ListValue* args);
 
   // Handles a request to store data that the web ui wishes to persist.
   // First element of |args| is the data to persist.
   void HandleSaveAppState(const base::ListValue* args);
 
-  // Gets the printer capabilities. First element of |args| is the printer name.
+  // Gets the printer capabilities for the printer |printer_name|.

[Lei Zhang, 2016/11/03 23:41:46]

You reverted back to HandleGetPrinterCapabilities() but the comment has been
changed to refer to a parameter that does not exist.

[skau, 2016/11/04 19:28:59]

Oops

   void HandleGetPrinterCapabilities(const base::ListValue* args);
 
 #if BUILDFLAG(ENABLE_BASIC_PRINT_DIALOG)
   // Asks the initiator renderer to show the native print system dialog. |args|
   // is unused.
   void HandleShowSystemDialog(const base::ListValue* args);
 #endif
 
   // Callback for the signin dialog to call once signin is complete.
   void OnSigninComplete();
@@ skipping 219 matching lines @@
   // Notifies tests that want to know if the PDF has been saved. This doesn't
   // notify the test if it was a successful save, only that it was attempted.
   base::Closure pdf_file_saved_closure_;
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_