Write out CacheStorageCache size to index file.

content/browser/cache_storage/cache_storage_cache.h

Index: content/browser/cache_storage/cache_storage_cache.h
diff --git a/content/browser/cache_storage/cache_storage_cache.h b/content/browser/cache_storage/cache_storage_cache.h
index 5fe67d0e55cfc5fd467f4bac6a7672068cee82d9..1d5996c053f32ee55639379574d2f9622877f158 100644
--- a/content/browser/cache_storage/cache_storage_cache.h
+++ b/content/browser/cache_storage/cache_storage_cache.h
@@ -33,9 +33,11 @@ class QuotaManagerProxy;
 }
 
 namespace content {
+class CacheMetadata;
 class CacheStorage;
 class CacheStorageBlobToDiskCache;
 class CacheStorageCacheHandle;
+class CacheStorageCacheObserver;
 class CacheStorageScheduler;
 class TestCacheStorageCache;
 
@@ -81,7 +83,8 @@ class CONTENT_EXPORT CacheStorageCache {
       const base::FilePath& path,
       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
       scoped_refptr<storage::QuotaManagerProxy> quota_manager_proxy,
-      base::WeakPtr<storage::BlobStorageContext> blob_context);
+      base::WeakPtr<storage::BlobStorageContext> blob_context,
+      int64_t cache_size);
 
   // Returns ERROR_TYPE_NOT_FOUND if not found.
   void Match(std::unique_ptr<ServiceWorkerFetchRequest> request,
@@ -156,6 +159,13 @@ class CONTENT_EXPORT CacheStorageCache {
 
   std::string cache_name() const { return cache_name_; }
 
+  int64_t cache_size() const { return cache_size_; }
+
+  // Set the one observer that will be notified of changes to this cache.
+  // Note: Either the observer must have a lifetime longer than this instance
+  // or call SetObserver(nullptr) to stop receiving notification of changes.
+  void SetObserver(CacheStorageCacheObserver* observer);
+
   base::WeakPtr<CacheStorageCache> AsWeakPtr();
 
  private:
@@ -197,7 +207,8 @@ class CONTENT_EXPORT CacheStorageCache {
       CacheStorage* cache_storage,
       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
       scoped_refptr<storage::QuotaManagerProxy> quota_manager_proxy,
-      base::WeakPtr<storage::BlobStorageContext> blob_context);
+      base::WeakPtr<storage::BlobStorageContext> blob_context,
+      int64_t cache_size);
 
   // Returns all entries in this cache.
   void OpenAllEntries(const OpenAllEntriesCallback& callback);
@@ -387,8 +398,9 @@ class CONTENT_EXPORT CacheStorageCache {
   BackendState backend_state_ = BACKEND_UNINITIALIZED;
   std::unique_ptr<CacheStorageScheduler> scheduler_;
   bool initializing_ = false;
-  int64_t cache_size_ = 0;
+  int64_t cache_size_;
   size_t max_query_size_bytes_;
+  CacheStorageCacheObserver* cache_observer_;
 
   // Owns the elements of the list
   BlobToDiskCacheIDMap active_blob_to_disk_cache_writers_;