[Chrome] Support NumCopies print preset

ppapi/proxy/printing_resource.cc

 // 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.
 
 #include "ppapi/proxy/printing_resource.h"
 
 #include "base/bind.h"
 #include "ipc/ipc_message.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/dispatch_reply_message.h"
@@ skipping 23 matching lines @@
     SendCreate(BROWSER, PpapiHostMsg_Printing_Create());
 
   Call<PpapiPluginMsg_Printing_GetDefaultPrintSettingsReply>(
       BROWSER,
       PpapiHostMsg_Printing_GetDefaultPrintSettings(),
       base::Bind(&PrintingResource::OnPluginMsgGetDefaultPrintSettingsReply,
           this, print_settings, callback));
   return PP_OK_COMPLETIONPENDING;
 }
 
+void PrintingResource::SetPrintPresetOptionsFromDocument(
+    PP_PrintPresetOptions_Dev* print_options) {
+  if (!sent_create_to_browser())
+    SendCreate(RENDERER, PpapiHostMsg_PrintHost_Create());
+
+  Post(RENDERER,
+       PpapiHostMsg_PrintHost_SetPrintPresetOptionsFromDocument(

[Vitaly Buka (NO REVIEWS), 2014/09/03 21:36:24]

why do you use Post here and not Call<> as above?

[Nikhil, 2014/09/04 11:42:53]

Call<> expects a response and a callback should be provided that will be called
when response is received. Whereas, Post() just sends IPC messages and doesn't
expect a reply.

Please see -
https://code.google.com/p/chromium/codesearch#chromium/src/ppapi/proxy/plugin...

In our case, we want to notify print preview to set print preset options based
on options set in the document. So we don't care about the response. That is why
I used Post().

Please let me know WDYT.

+           *print_options));
+}
+
 void PrintingResource::OnPluginMsgGetDefaultPrintSettingsReply(
     PP_PrintSettings_Dev* settings_out,
     scoped_refptr<TrackedCallback> callback,
     const ResourceMessageReplyParams& params,
     const PP_PrintSettings_Dev& settings) {
   if (params.result() == PP_OK)
     *settings_out = settings;
 
   // Notify the plugin of the new data.
   callback->Run(params.result());
   // DANGER: May delete |this|!
 }
 
 }  // namespace proxy
 }  // namespace ppapi