Extensions: Send the tab id to platform apps.

chrome/renderer/extensions/request_sender.cc

Index: chrome/renderer/extensions/request_sender.cc
===================================================================
--- chrome/renderer/extensions/request_sender.cc	(revision 246091)
+++ chrome/renderer/extensions/request_sender.cc	(working copy)
@@ -57,6 +57,7 @@
                                  int request_id,
                                  bool has_callback,
                                  bool for_io_thread,
+                                 int source_tab_id,

[not at google - send to devlin, 2014/01/24 21:37:27]

yeah so (assuming I'm thinking about this right) the ScopedTabId class would be
on RequestSender. It would would read that (class-) global variable below when
setting params.source_tab_id rather than passing it in here.

                                  base::ListValue* value_args) {
   ChromeV8Context* context = source->GetContext();
   if (!context)
@@ -90,6 +91,7 @@
   params.arguments.Swap(value_args);
   params.extension_id = context->GetExtensionID();
   params.source_url = source_url;
+  params.source_tab_id = source_tab_id;
   params.request_id = request_id;
   params.has_callback = has_callback;
   params.user_gesture =