[Extension Bindings] Add JS custom hook support

extensions/renderer/api_bindings_system.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/api_bindings_system.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "extensions/renderer/api_binding_hooks.h"
 
 namespace extensions {
 
 APIBindingsSystem::Request::Request() {}
 APIBindingsSystem::Request::~Request() {}
 
 APIBindingsSystem::APIBindingsSystem(const binding::RunJSFunction& call_js,
                                      const GetAPISchemaMethod& get_api_schema,
                                      const SendRequestMethod& send_request)
     : request_handler_(call_js),
       event_handler_(call_js),
+      call_js_(call_js),
       get_api_schema_(get_api_schema),
       send_request_(send_request) {}
 
 APIBindingsSystem::~APIBindingsSystem() {}
 
 v8::Local<v8::Object> APIBindingsSystem::CreateAPIInstance(
     const std::string& api_name,
     v8::Local<v8::Context> context,
     v8::Isolate* isolate,
     const APIBinding::AvailabilityCallback& is_available) {
@@ skipping 40 matching lines @@
                                            const base::ListValue& response) {
   event_handler_.FireEventInContext(event_name, context, response);
 }
 
 APIBindingHooks* APIBindingsSystem::GetHooksForAPI(
     const std::string& api_name) {
   DCHECK(api_bindings_.empty())
       << "Hook registration must happen before creating any binding instances.";
   std::unique_ptr<APIBindingHooks>& hooks = binding_hooks_[api_name];
   if (!hooks)
-    hooks = base::MakeUnique<APIBindingHooks>();
+    hooks = base::MakeUnique<APIBindingHooks>(call_js_);
   return hooks.get();
 }
 
 void APIBindingsSystem::OnAPICall(const std::string& name,
                                   std::unique_ptr<base::ListValue> arguments,
                                   v8::Isolate* isolate,
                                   v8::Local<v8::Context> context,
                                   v8::Local<v8::Function> callback) {
   auto request = base::MakeUnique<Request>();
   if (!callback.IsEmpty()) {
     request->request_id =
         request_handler_.AddPendingRequest(isolate, callback, context);
     request->has_callback = true;
   }
   // TODO(devlin): Query and curry user gestures around.
   request->has_user_gesture = false;
   request->arguments = std::move(arguments);
   request->method_name = name;
 
   send_request_.Run(std::move(request), context);
 }
 
 }  // namespace extensions