Implement asynchronous interface/plumbing for GetDefaultPrintSettings.

ppapi/api/dev/ppp_printing_dev.idl

Index: ppapi/api/dev/ppp_printing_dev.idl
diff --git a/ppapi/api/dev/ppp_printing_dev.idl b/ppapi/api/dev/ppp_printing_dev.idl
index df107abe009b69ffa1438172b176a1b39b2d05c7..fdc030631e8c4ebab58ec5712fe5c8156b7ccdae 100644
--- a/ppapi/api/dev/ppp_printing_dev.idl
+++ b/ppapi/api/dev/ppp_printing_dev.idl
@@ -9,7 +9,8 @@
 
 // Note: This version should always match the PPB_Printing_Dev interface.
 label Chrome {
-  M21 = 0.6
+  M21 = 0.6,
+  M23 = 0.7

[raymes, 2012/07/20 22:46:56]

Trung mentioned that this interface version should always match the ppb
interface version. I'm not certain how to guarantee that though (just having the
label here doesn't guarantee the interface is generated)

[dmichael (off chromium), 2012/07/23 18:20:09]

I don't think that's strictly true...  your change would work fine either way.
But I think it's a practice that we wanted to start doing, even though it's
unnecessary a lot of the time.
There's a presubmit check to make sure that IDL changes are reflected in the
code (though it doesn't check that PPP and PPB interfaces match).

[raymes, 2012/07/24 00:37:08]

Done. I had to remove the M21 label for it to pick up the change. Backward
compatibility isn't needed on the PPP side by the looks of it.

On 2012/07/23 18:20:09, dmichael wrote:

 };
 
 /**