List printers managed by extensions in print preview

chrome/browser/ui/webui/print_preview/print_preview_handler.h

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.h b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
index cbc6e1bf4a4063c5a80124c51187227f9734111e..55b136bf740677e8e4d1b0408a0e0c17b2290282 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -124,6 +124,9 @@ class PrintPreviewHandler
   // Starts getting all local privet printers. |arg| is unused.
   void HandleGetPrivetPrinters(const base::ListValue* args);
 
+  // Starts getting all local extension managed printers. |arg| is unused.
+  void HandleGetExtensionPrinters(const base::ListValue* args);
+
   // Stops getting all local privet printers. |arg| is unused.
   void HandleStopGetPrivetPrinters(const base::ListValue* args);
 
@@ -196,6 +199,11 @@ class PrintPreviewHandler
 
   void HandleGetPrivetPrinterCapabilities(const base::ListValue* arg);
 
+  // Requests an extension managed printer's capabilities.
+  // |arg| contains the ID of the extension from which the capabilities are
+  // requested and the ID of the printer whose capabilities are requested.
+  void HandleGetExtensionPrinterCapabilities(const base::ListValue* args);
+
   void SendInitialSettings(const std::string& default_printer);
 
   // Send OAuth2 access token.
@@ -282,6 +290,22 @@ class PrintPreviewHandler
       base::DictionaryValue* printer_value);
 #endif
 
+  // Called when a list of printers is reported by an extension.
+  // |printers|: The list of printers managed by the extension.
+  // |done|: Whether all the extensions have reported the list of printers
+  //     they manage.
+  void OnGotPrintersForExtension(const base::ListValue& printers, bool done);
+
+  // Called when an extension reports the set of print capabilites for a
+  // printer.
+  // |extension_id|: The extension that manages the printer.
+  // |printer_id|: The id of the pritner whose capabilities are reported.
+  // |capabilities|: The printer capabilities.
+  void OnGotExtensionPrinterCapabilities(
+      const std::string& extension_id,

[Vitaly Buka (NO REVIEWS), 2015/02/03 16:55:48]

why do we need to have separate extension id and printer id here.
Can we just combine them on native layer and just have single string here?

+      const std::string& printer_id,
+      const base::DictionaryValue& capabilities);
+
   // Register/unregister from notifications of changes done to the GAIA
   // cookie.
   void RegisterForMergeSession();