[Chrome] Support NumCopies print preset

ppapi/proxy/printing_resource.cc

Index: ppapi/proxy/printing_resource.cc
diff --git a/ppapi/proxy/printing_resource.cc b/ppapi/proxy/printing_resource.cc
index d9be3b7430194e8866d401f3e5f093ce1b23b67d..4442c450ba53392598f5c12fde60eadd9ffc9e19 100644
--- a/ppapi/proxy/printing_resource.cc
+++ b/ppapi/proxy/printing_resource.cc
@@ -41,6 +41,16 @@ int32_t PrintingResource::GetDefaultPrintSettings(
   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,