Extension Storage API: expose storage quota information to extensions, via:

chrome/browser/extensions/settings/settings_frontend_unittest.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 "testing/gtest/include/gtest/gtest.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/scoped_temp_dir.h"
+#include "base/string_number_conversions.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/extensions/settings/settings_frontend.h"
 #include "chrome/browser/extensions/settings/settings_namespace.h"
 #include "chrome/browser/extensions/settings/settings_storage.h"
 #include "chrome/browser/extensions/settings/settings_test_util.h"
+#include "chrome/common/extensions/api/extension_api.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/test/test_browser_thread.h"
 
 using content::BrowserThread;
 
 namespace extensions {
 
 using namespace settings_namespace;
 using namespace settings_test_util;
 
@@ skipping 52 matching lines @@
   virtual void TearDown() OVERRIDE {
     frontend_.reset();
     profile_.reset();
   }
 
  protected:
   void ResetFrontend() {
     storage_factory_->Reset(new SettingsLeveldbStorage::Factory());
     frontend_.reset(
         SettingsFrontend::Create(storage_factory_.get(), profile_.get()));
+    // frontend_ needs a message loop to initialise.
+    MessageLoop::current()->RunAllPending();
   }
 
   ScopedTempDir temp_dir_;
   scoped_ptr<MockProfile> profile_;
   scoped_ptr<SettingsFrontend> frontend_;
   scoped_refptr<ScopedSettingsStorageFactory> storage_factory_;
 
  private:
   MessageLoop message_loop_;
   content::TestBrowserThread ui_thread_;
@@ skipping 199 matching lines @@
       id, Extension::TYPE_EXTENSION, permissions);
 
   frontend_->RunWithStorage(
       id, SYNC, base::Bind(&UnlimitedSyncStorageTestCallback));
   frontend_->RunWithStorage(
       id, LOCAL, base::Bind(&UnlimitedLocalStorageTestCallback));
 
   MessageLoop::current()->RunAllPending();
 }
 
+// Returns an int given as a string in |dict| at |path|, or -1 if there is not
+// int located there.
+static int GetInteger(const DictionaryValue& dict, const std::string& path) {
+  int integer = -1;
+  {
+    std::string integer_as_string;
+    dict.GetString(path, &integer_as_string);
+    base::StringToInt(integer_as_string, &integer);
+  }
+  return integer;
+}
+
+TEST_F(ExtensionSettingsFrontendTest, QuotaLimitsMatchJson) {
+  const DictionaryValue* storage_api =
+      ExtensionAPI::GetInstance()->GetSchema("storage");
+  CHECK(storage_api);
+
+  EXPECT_EQ(
+      (int) SettingsFrontend::kSyncQuota.quota_bytes,
+      GetInteger(*storage_api,
+                 "properties.sync.properties.QUOTA_BYTES.value"));
+  EXPECT_EQ(
+      (int) SettingsFrontend::kSyncQuota.quota_bytes_per_item,
+      GetInteger(*storage_api,
+                 "properties.sync.properties.QUOTA_BYTES_PER_ITEM.value"));
+  EXPECT_EQ(
+      (int) SettingsFrontend::kSyncQuota.max_items,
+      GetInteger(*storage_api,
+                 "properties.sync.properties.MAX_ITEMS.value"));
+
+  EXPECT_EQ(
+      (int) SettingsFrontend::kLocalQuota.quota_bytes,
+      GetInteger(*storage_api,
+                 "properties.local.properties.QUOTA_BYTES.value"));
+  EXPECT_FALSE(storage_api->HasKey(
+      "properties.local.properties.QUOTA_BYTES_PER_ITEM.value"));
+  EXPECT_FALSE(storage_api->HasKey(
+      "properties.local.properties.MAX_ITEMS.value"));
+}
+
 }  // namespace extensions