Implement declarativeContent API.

chrome/renderer/extensions/module_system.h

Index: chrome/renderer/extensions/module_system.h
diff --git a/chrome/renderer/extensions/module_system.h b/chrome/renderer/extensions/module_system.h
index 4f790842aec9f0a5095e355b90c10a2d991a837b..339e1bf02f1ba1286802e2437bc57e66e67d2054 100644
--- a/chrome/renderer/extensions/module_system.h
+++ b/chrome/renderer/extensions/module_system.h
@@ -81,6 +81,13 @@ class ModuleSystem : public NativeHandler {
   void CallModuleMethod(const std::string& module_name,
                         const std::string& method_name);
 
+  // Calls the specified method exported by the specified module. This is
+  // equivalent to calling require('module_name').method_name(args) from JS.
+  v8::Local<v8::Value> CallModuleMethod(
+      const std::string& module_name,
+      const std::string& method_name,
+      std::vector<v8::Handle<v8::Value> >* args);
+
   // Register |native_handler| as a potential target for requireNative(), so
   // calls to requireNative(|name|) from JS will return a new object created by
   // |native_handler|.