Implement initialization for GDataCache to use in-memory metadata for tests.

chrome/browser/chromeos/gdata/gdata_cache.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_CACHE_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_CACHE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 254 matching lines @@
                         const CacheOperationCallback& callback);
 
   // Does the following:
   // - remove all the files in the cache directory.
   // - re-create the |metadata_| instance.
   void ClearAllOnUIThread(const ChangeCacheStateCallback& callback);
 
   // Utility method to call Initialize on UI thread.
   void RequestInitializeOnUIThread();
 
+  // Utility method to call InitializeForTesting on UI thread.
+  void RequestInitializeOnUIThreadForTesting();
+
   // Force a rescan of cache files, for testing.
   void ForceRescanOnUIThreadForTesting();
 
   // Gets the cache entry for file corresponding to |resource_id| and |md5|
   // and returns true if entry exists in cache map.  Otherwise, returns false.
   // |md5| can be empty if only matching |resource_id| is desired, which may
   // happen when looking for pinned entries where symlinks' filenames have no
   // extension and hence no md5.
   bool GetCacheEntry(const std::string& resource_id,
                      const std::string& md5,
@@ skipping 37 matching lines @@
              base::SequencedTaskRunner* blocking_task_runner);
   virtual ~GDataCache();
 
   // Checks whether the current thread is on the right sequenced worker pool
   // with the right sequence ID. If not, DCHECK will fail.
   void AssertOnSequencedWorkerPool();
 
   // Initializes the cache.
   void Initialize();
 
+  // Initializes the cache with in-memory cache for testing.
+  // The in-memory cache is used since it's faster than the db.
+  void InitializeForTesting();
+
   // Deletes the cache.
   void Destroy();
 
   // Force a rescan of cache directories.
   void ForceRescanForTesting();
 
   // Used to implement GetResourceIdsOfBacklogOnUIThread.
   void GetResourceIdsOfBacklog(
       std::vector<std::string>* to_fetch,
       std::vector<std::string>* to_upload);
@@ skipping 123 matching lines @@
 };
 
 // Sets the free disk space getter for testing.
 // The existing getter is deleted.
 void SetFreeDiskSpaceGetterForTesting(
     FreeDiskSpaceGetterInterface* getter);
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_CACHE_H_