PPAPI: Add an API for setting a custom user agent for URL requests.

ppapi/api/ppb_url_request_info.idl

Index: ppapi/api/ppb_url_request_info.idl
diff --git a/ppapi/api/ppb_url_request_info.idl b/ppapi/api/ppb_url_request_info.idl
index c6baedf668d1293760d814dbce19ec54f921e8b1..2ce1dc909dcb0d0257d2765b420bb2c7e47775bb 100644
--- a/ppapi/api/ppb_url_request_info.idl
+++ b/ppapi/api/ppb_url_request_info.idl
@@ -140,7 +140,19 @@ enum PP_URLRequestProperty {
    * <code>PP_URLREQUESTPROPERTY_PREFETCHBUFFERUPPERTHRESHOLD</code> must also
    * be set. Behavior is undefined if the former is >= the latter.
    */
-  PP_URLREQUESTPROPERTY_PREFETCHBUFFERLOWERTHRESHOLD = 12
+  PP_URLREQUESTPROPERTY_PREFETCHBUFFERLOWERTHRESHOLD = 12,
+
+  /**
+   * This corresponds to a string (<code>PP_VARTYPE_STRING</code>) or may be
+   * undefined (<code>PP_VARTYPE_UNDEFINED</code>; default).
+   * Set it to a string to set a custom user-agent header (if empty, that header
+   * will be omitted), or to undefined to use the default
+   * (if any). Only loaders with universal access (only available on trusted
+   * implementations) will accept <code>URLRequestInfo</code> objects that try
+   * to set a custom content transfer encoding; if given to a loader without

[brettw, 2012/07/10 04:54:45]

transfer encoding -> user agent

+   * universal access, <code>PP_ERROR_NOACCESS</code> will result.
+   */
+  PP_URLREQUESTPROPERTY_CUSTOMUSERAGENT = 13
 };
 
 /**