Make quota logic obey durable storage permission

storage/browser/quota/special_storage_policy.h

Index: storage/browser/quota/special_storage_policy.h
diff --git a/storage/browser/quota/special_storage_policy.h b/storage/browser/quota/special_storage_policy.h
index d164e94281229c3ef7568d1d875f16a821903c83..5c97806a0b8d0beb4cb9cb1ec6ca296ea41bd30d 100644
--- a/storage/browser/quota/special_storage_policy.h
+++ b/storage/browser/quota/special_storage_policy.h
@@ -45,9 +45,12 @@ class STORAGE_EXPORT SpecialStoragePolicy
   // Protected storage is not subject to removal by the browsing data remover.
   virtual bool IsStorageProtected(const GURL& origin) = 0;
 
-  // Unlimited storage is not subject to 'quotas'.
+  // Unlimited storage is not subject to quota or storage pressure eviction.
   virtual bool IsStorageUnlimited(const GURL& origin) = 0;
 
+  // Durable storage is not subject to storage pressure eviction.
+  virtual bool IsStorageDurable(const GURL& origin) = 0;
+
   // Some origins (e.g. installed apps) have access to the size of the remaining
   // disk capacity.
   virtual bool CanQueryDiskSize(const GURL& origin) = 0;