Add support for writing unit tests for Mojo-backed apps/extensions APIs.

extensions/renderer/dispatcher.h

Index: extensions/renderer/dispatcher.h
diff --git a/extensions/renderer/dispatcher.h b/extensions/renderer/dispatcher.h
index b6a630dda8b87ad1ed0978d0597907ef932aa183..a0308a1e5b5ac15789f08211334b53df2bebfb3b 100644
--- a/extensions/renderer/dispatcher.h
+++ b/extensions/renderer/dispatcher.h
@@ -8,6 +8,7 @@
 #include <map>
 #include <set>
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "base/scoped_observer.h"
@@ -136,6 +137,15 @@ class Dispatcher : public content::RenderProcessObserver,
 
   void ClearPortData(int port_id);
 
+  // Returns a list of (module name, resource id) pairs for the JS modules to
+  // add to the source map.
+  static std::vector<std::pair<std::string, int> > GetJsResources();
+  static void RegisterNativeHandlers(ModuleSystem* module_system,

[not at google - send to devlin, 2014/07/25 15:59:06]

document this method and mention that |dispatcher|, |request_sender|, and
|v8_schema_registry| can all be NULL.

it's pretty weird to have a static method on Dispatcher which takes a Dispatcher
that can be NULL. oh well, no big deal.

+                                     ScriptContext* context,
+                                     Dispatcher* dispatcher,
+                                     RequestSender* request_sender,
+                                     V8SchemaRegistry* v8_schema_registry);
+
  private:
   friend class ::ChromeRenderViewTest;
   FRIEND_TEST_ALL_PREFIXES(RendererPermissionsPolicyDelegateTest,