Lazily load extension API schemas

chrome/renderer/extensions/chrome_v8_context.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/chrome_v8_context.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/strings/string_split.h"
 #include "base/values.h"
 #include "chrome/common/extensions/api/extension_api.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_set.h"
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
 #include "chrome/renderer/extensions/module_system.h"
 #include "chrome/renderer/extensions/user_script_slave.h"
 #include "content/public/renderer/render_view.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 
 namespace {
 
 const char kChromeHidden[] = "chromeHidden";
-const char kUnavailableMessage[] = "You do not have permission to access this "
-                                   "API. Ensure that the required permission "
-                                   "or manifest property is included in your "
-                                   "manifest.json.";
-
 const char kValidateCallbacks[] = "validateCallbacks";
 const char kValidateAPI[] = "validateAPI";
 
 }  // namespace
 
 ChromeV8Context::ChromeV8Context(v8::Handle<v8::Context> v8_context,
                                  WebKit::WebFrame* web_frame,
                                  const Extension* extension,
                                  Feature::Context context_type)
     : v8_context_(v8_context),
       web_frame_(web_frame),
       extension_(extension),
-      context_type_(context_type),
-      available_extension_apis_initialized_(false) {
+      context_type_(context_type) {
   VLOG(1) << "Created context:\n"
           << "  extension id: " << GetExtensionID() << "\n"
           << "  frame:        " << web_frame_ << "\n"
           << "  context type: " << GetContextTypeDescription();
 }
 
 ChromeV8Context::~ChromeV8Context() {
   VLOG(1) << "Destroyed context for extension\n"
           << "  extension id: " << GetExtensionID();
   Invalidate();
@@ skipping 91 matching lines @@
       web_frame_->callFunctionEvenIfScriptDisabled(function,
                                                    v8::Object::New(),
                                                    argc,
                                                    argv);
   if (result)
     *result = result_temp;
 
   return true;
 }
 
-const std::set<std::string>& ChromeV8Context::GetAvailableExtensionAPIs() {
-  if (!available_extension_apis_initialized_) {
-    available_extension_apis_ =
-        ExtensionAPI::GetSharedInstance()->GetAPIsForContext(
-            context_type_,
-            extension_,
-            UserScriptSlave::GetDataSourceURLForFrame(web_frame_));
-    available_extension_apis_initialized_ = true;
-  }
-  return available_extension_apis_;
-}
-
 Feature::Availability ChromeV8Context::GetAvailability(
     const std::string& api_name) {
-  const std::set<std::string>& available_apis = GetAvailableExtensionAPIs();
-
-  // TODO(cduvall/kalman): Switch to ExtensionAPI::IsAvailable() once Features
-  // are complete.
-  if (available_apis.find(api_name) != available_apis.end())
-    return Feature::CreateAvailability(Feature::IS_AVAILABLE, "");
-
-  return Feature::CreateAvailability(Feature::INVALID_CONTEXT,
-                                     kUnavailableMessage);
+  return ExtensionAPI::GetSharedInstance()->IsAvailable(
+      api_name,
+      extension_,
+      context_type_,
+      UserScriptSlave::GetDataSourceURLForFrame(web_frame_));
 }
 
 void ChromeV8Context::DispatchOnLoadEvent(bool is_incognito_process,
                                           int manifest_version) {
   v8::HandleScope handle_scope;
   v8::Handle<v8::Value> argv[] = {
     v8::String::New(GetExtensionID().c_str()),
     v8::String::New(GetContextTypeDescription().c_str()),
     v8::Boolean::New(is_incognito_process),
     v8::Integer::New(manifest_version),
@@ skipping 12 matching lines @@
     case Feature::BLESSED_EXTENSION_CONTEXT:   return "BLESSED_EXTENSION";
     case Feature::UNBLESSED_EXTENSION_CONTEXT: return "UNBLESSED_EXTENSION";
     case Feature::CONTENT_SCRIPT_CONTEXT:      return "CONTENT_SCRIPT";
     case Feature::WEB_PAGE_CONTEXT:            return "WEB_PAGE";
   }
   NOTREACHED();
   return "";
 }
 
 }  // namespace extensions