[Quota] Lower quota for ephemeral mode (ie. session only)

storage/browser/quota/quota_settings.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 STORAGE_BROWSER_QUOTA_QUOTA_SETTINGS_H_
 #define STORAGE_BROWSER_QUOTA_QUOTA_SETTINGS_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/optional.h"
 #include "base/time/time.h"
 #include "storage/browser/storage_browser_export.h"
 
 namespace storage {
 
 // Settings the storage lib embedder must provide to the QuotaManager.
 struct QuotaSettings {
   QuotaSettings() = default;
   QuotaSettings(int64_t pool_size,
                 int64_t per_host_quota,
                 int64_t should_remain_available,
                 int64_t must_remain_available)
       : pool_size(pool_size),
         per_host_quota(per_host_quota),
+        session_only_per_host_quota(per_host_quota),
         should_remain_available(should_remain_available),
         must_remain_available(must_remain_available) {}
 
   // The target size in bytes of the shared pool of disk space the quota
   // system allows for use by websites using HTML5 storage apis, for
   // example an embedder may use 50% of the total volume size.
   int64_t pool_size = 0;
 
   // The amount in bytes of the pool an individual site may consume. The
   // value must be less than or equal to the pool_size.
   int64_t per_host_quota = 0;
 
+  // The amount allotted to origins that are considered session only
+  // according to the SpecialStoargePolicy provided by the embedder.

[jsbell, 2017/04/04 16:23:57]

typo: 'Stoarge'

[michaeln, 2017/04/05 01:20:56]

Done.

+  int64_t session_only_per_host_quota = 0;
+
   // The amount of space that should remain available on the storage
   // volume. As the volume approaches this limit, the quota system gets
   // more aggressive about evicting data.
   int64_t should_remain_available = 0;
 
   // The amount of space that must remain available on the storage
   // volume. As the volume approaches this limit, the quota system gets
   // very aggressive about disallowing new data.
   int64_t must_remain_available = 0;
 
@@ skipping 32 matching lines @@
 // Returns settings that provide given |per_host_quota| and a total poolsize of
 // five times that.
 inline QuotaSettings GetHardCodedSettings(int64_t per_host_quota) {
   return QuotaSettings(per_host_quota * 5, per_host_quota,
                        per_host_quota, per_host_quota);
 }
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_QUOTA_QUOTA_MANAGER_H_