Write out CacheStorageCache size to index file.

content/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//printing/features/features.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
@@ skipping 330 matching lines @@
     "byte_stream.cc",
     "byte_stream.h",
     "cache_storage/cache_storage.cc",
     "cache_storage/cache_storage.h",
     "cache_storage/cache_storage_blob_to_disk_cache.cc",
     "cache_storage/cache_storage_blob_to_disk_cache.h",
     "cache_storage/cache_storage_cache.cc",
     "cache_storage/cache_storage_cache.h",
     "cache_storage/cache_storage_cache_handle.cc",
     "cache_storage/cache_storage_cache_handle.h",
+    "cache_storage/cache_storage_cache_observer.h",
     "cache_storage/cache_storage_context_impl.cc",
     "cache_storage/cache_storage_context_impl.h",
     "cache_storage/cache_storage_dispatcher_host.cc",
     "cache_storage/cache_storage_dispatcher_host.h",
     "cache_storage/cache_storage_histogram_macros.h",
     "cache_storage/cache_storage_manager.cc",
     "cache_storage/cache_storage_manager.h",
     "cache_storage/cache_storage_operation.cc",
     "cache_storage/cache_storage_operation.h",
     "cache_storage/cache_storage_quota_client.cc",
@@ skipping 1591 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }