Lazy load chrome.* APIs

chrome/renderer/extensions/api_definitions_natives.cc

 // Copyright (c) 2012 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 "chrome/renderer/extensions/api_definitions_natives.h"
 
 #include <algorithm>
 
 namespace {
 const char kInvalidExtensionNamespace[] = "Invalid extension namespace";
 }
 
 namespace extensions {
 
-ApiDefinitionsNatives::ApiDefinitionsNatives(Dispatcher* dispatcher)
-    : ChromeV8Extension(dispatcher) {
+ApiDefinitionsNatives::ApiDefinitionsNatives(Dispatcher* dispatcher,
+                                             ChromeV8Context* context)
+    : ChromeV8Extension(dispatcher, context->v8_context()),
+      context_(context) {
   RouteFunction("GetExtensionAPIDefinition",
                 base::Bind(&ApiDefinitionsNatives::GetExtensionAPIDefinition,
                            base::Unretained(this)));
 }
 
 v8::Handle<v8::Value> ApiDefinitionsNatives::GetExtensionAPIDefinition(
     const v8::Arguments& args) {
-  ChromeV8Context* v8_context = dispatcher()->v8_context_set().GetCurrent();
-  CHECK(v8_context);
-
-  std::set<std::string> available_apis(v8_context->GetAvailableExtensionAPIs());
+  std::set<std::string> available_apis(context_->GetAvailableExtensionAPIs());
   if (args.Length() == 0)
     return dispatcher()->v8_schema_registry()->GetSchemas(available_apis);
 
   // Build set of APIs requested by the user.
   std::set<std::string> requested_apis;
   for (int i = 0; i < args.Length(); ++i) {
     if (!args[i]->IsString()) {
       v8::ThrowException(v8::String::New(kInvalidExtensionNamespace));
       return v8::Undefined();
     }
     requested_apis.insert(*v8::String::Utf8Value(args[i]->ToString()));
   }
 
   // Filter those that are unknown.
   std::set<std::string> apis_to_check;
   std::set_intersection(requested_apis.begin(), requested_apis.end(),
                         available_apis.begin(), available_apis.end(),
                         std::inserter(apis_to_check, apis_to_check.begin()));
   return dispatcher()->v8_schema_registry()->GetSchemas(apis_to_check);
 }
 
 }  // namespace extensions