PPAPI: Set custom user agent in headers, if applicable.

webkit/plugins/ppapi/ppb_url_request_info_impl.cc

Index: webkit/plugins/ppapi/ppb_url_request_info_impl.cc
diff --git a/webkit/plugins/ppapi/ppb_url_request_info_impl.cc b/webkit/plugins/ppapi/ppb_url_request_info_impl.cc
index 55c6d3ac1fcaac0663b5986e23e31bdb09b3daf2..9bc99bf00a9f30dd6842b9168e75bfeb27935d69 100644
--- a/webkit/plugins/ppapi/ppb_url_request_info_impl.cc
+++ b/webkit/plugins/ppapi/ppb_url_request_info_impl.cc
@@ -120,6 +120,13 @@ bool PPB_URLRequestInfo_Impl::ToWebURLRequest(WebFrame* frame,
         WebString::fromUTF8(data().custom_content_transfer_encoding));
   }
 
+  if (data().has_custom_user_agent) {
+    // TODO(viettrungluu): If |custom_user_agent| is empty, we're supposed to
+    // arrange for User-Agent to be omitted; this probably won't do that.
+    dest->addHTTPHeaderField(WebString::fromUTF8("User-Agent"),
+                             WebString::fromUTF8(data().custom_user_agent));
+  }
+
   return true;
 }