Add 1st cut of FileSystemUsageTracker that tracks the usage changes in FileSystem API.

webkit/fileapi/file_system_usage_tracker_unittest.cc

+// Copyright (c) 2011 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 "webkit/fileapi/file_system_usage_tracker.h"
+
+#include "base/basictypes.h"
+#include "base/file_util.h"
+#include "base/message_loop.h"
+#include "base/message_loop_proxy.h"
+#include "base/scoped_callback_factory.h"
+#include "googleurl/src/gurl.h"
+#include "base/scoped_temp_dir.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webkit/fileapi/file_system_path_manager.h"
+#include "webkit/fileapi/file_system_types.h"
+
+using namespace fileapi;
+
+class FileSystemUsageTrackerTest : public testing::Test {
+ public:
+  FileSystemUsageTrackerTest()
+      : callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
+  }
+
+  void SetUp() {
+    ASSERT_TRUE(data_dir_.CreateUniqueTempDir());
+  }
+
+ protected:
+  FileSystemUsageTracker* NewUsageTracker(bool is_incognito) {
+    return new FileSystemUsageTracker(
+        base::MessageLoopProxy::CreateForCurrentThread(),
+        data_dir_.path(), is_incognito);
+  }
+
+  int64 GetOriginUsage(FileSystemUsageTracker* tracker,
+                       const GURL& origin_url,
+                       fileapi::FileSystemType type) {
+    tracker->GetOriginUsage(origin_url, type,
+        callback_factory_.NewCallback(
+            &FileSystemUsageTrackerTest::OnGetUsage));
+    MessageLoop::current()->RunAllPending();
+    return usage_;
+  }
+
+ private:
+  void OnGetUsage(int64 usage) {
+    usage_ = usage;
+  }
+
+  ScopedTempDir data_dir_;
+  base::ScopedCallbackFactory<FileSystemUsageTrackerTest> callback_factory_;
+  int64 usage_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileSystemUsageTrackerTest);
+};
+
+// TODO(dmikurube): change this test to a meaningful one once we add
+// the real code in the FileSystemUsageTracker.
+TEST_F(FileSystemUsageTrackerTest, DummyTest) {
+  scoped_ptr<FileSystemUsageTracker> tracker(NewUsageTracker(false));
+  ASSERT_EQ(0, GetOriginUsage(tracker.get(),
+                              GURL("http://www.dummy.org/"),
+                              fileapi::kFileSystemTypeTemporary));
+}