Write out CacheStorageCache size to index file.

content/browser/cache_storage/cache_storage_cache_observer.h

+// Copyright 2016 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 CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_CACHE_OBSERVER_H_
+#define CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_CACHE_OBSERVER_H_
+
+#include "content/common/content_export.h"
+
+namespace content {
+
+class CacheStorageCache;
+
+class CONTENT_EXPORT CacheStorageCacheObserver {
+ public:
+  // An cache was modified, possibly changing it's size.

[jkarlin, 2016/10/21 18:04:19]

s/An/A/

[cmumford, 2016/11/10 17:28:16]

Done.

+  virtual void CacheModified(const CacheStorageCache* cache,

[jkarlin, 2016/10/21 19:24:39]

These two functions are subtly different and it's not clear when each would be
called and why.

[cmumford, 2016/11/10 17:28:17]

Agreed. I decided to merge the two into CacheSizeSet with a SET/DELTA enum -
similar to fseek. Hopefully this is more clear.

+                             int64_t size_delta) = 0;
+
+  // The cache size has been set.
+  virtual void SetCacheSize(const CacheStorageCache* cache,

[jkarlin, 2016/10/21 19:24:39]

Prefer CacheSizeSet as you're not actually setting the size here.

[cmumford, 2016/11/10 17:28:16]

Acknowledged.

+                            int64_t cache_size) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_CACHE_OBSERVER_H_