Implement asynchronous interface/plumbing for GetDefaultPrintSettings.

content/browser/renderer_host/pepper/pepper_message_filter.h

Index: content/browser/renderer_host/pepper/pepper_message_filter.h
diff --git a/content/browser/renderer_host/pepper/pepper_message_filter.h b/content/browser/renderer_host/pepper/pepper_message_filter.h
index 4ea0a4270e6d2b55aa0765b0ae630d9bcd65feeb..03236d603372caf4207ddaa8479cd21072ecfca1 100644
--- a/content/browser/renderer_host/pepper/pepper_message_filter.h
+++ b/content/browser/renderer_host/pepper/pepper_message_filter.h
@@ -21,6 +21,7 @@
 #include "net/base/net_util.h"
 #include "net/base/ssl_config_service.h"
 #include "net/socket/stream_socket.h"
+#include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/host/ppapi_host.h"
@@ -31,6 +32,7 @@ class PepperTCPSocket;
 class PepperUDPSocket;
 struct PP_HostResolver_Private_Hint;
 struct PP_NetAddress_Private;
+struct PP_PrintSettings_Dev;
 
 namespace base {
 class ListValue;
@@ -220,6 +222,9 @@ class PepperMessageFilter
   void OnGetDeviceID(std::string* id);
   void OnGetDeviceIDAsync(int32_t routing_id, PP_Resource resource);
 
+  // Gets the default print settings and sends them to the plugin process.
+  void OnGetDefaultPrintSettings(int32 routing_id, PP_Instance instance);
+
   // Callback when the font list has been retrieved on a background thread.
   void GetFontFamiliesComplete(IPC::Message* reply_msg,
                                scoped_ptr<base::ListValue> result);