Implement the ability to obliterate a storage partition from disk.

content/public/browser/content_browser_client.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 260 matching lines @@
 
   // Allows the embedder to provide a validation check for |partition_id|s.
   // This domain of valid entries should match the range of outputs for
   // GetStoragePartitionIdForChildProcess().
   virtual bool IsValidStoragePartitionId(BrowserContext* browser_context,
                                          const std::string& partition_id);
 
   // Allows the embedder to provide a storage parititon configuration for a
   // site. A storage partition configuration includes a domain of the embedder's
   // choice, an optional name within that domain, and whether the partition is
-  // in-memory only. The |partition_domain| is [a-z]* UTF-8 string, specifying
-  // the domain in which partitions live (similar to namespace). Within a
-  // domain, partitions can be uniquely identified by the combination of
-  // |partition_name| and |in_memory| values. When a partition is not to be
-  // persisted, the |in_memory| value must be set to true.
+  // in-memory only.
+  //
+  // If |can_be_default| is false, the caller is telling the embedder that the
+  // |site| is known to not be in the default partition. This is useful in
+  // some shutdown situations where the bookkeeping logic that maps sites to
+  // their partition configuration are no longer valid.
+  //
+  // The |partition_domain| is [a-z]* UTF-8 string, specifying the domain in
+  // which partitions live (similar to namespace). Within a domain, partitions
+  // can be uniquely identified by the combination of |partition_name| and
+  // |in_memory| values. When a partition is not to be persisted, the
+  // |in_memory| value must be set to true.
   virtual void GetStoragePartitionConfigForSite(
       content::BrowserContext* browser_context,
       const GURL& site,
+      bool can_be_default,
       std::string* partition_domain,
       std::string* partition_name,
       bool* in_memory);
 
   // Create and return a new quota permission context.
   virtual QuotaPermissionContext* CreateQuotaPermissionContext();
 
   // Open the given file in the desktop's default manner.
   virtual void OpenItem(const FilePath& path) {}
 
@@ skipping 177 matching lines @@
   // This is called on a worker thread.
   virtual
       crypto::CryptoModuleBlockingPasswordDelegate* GetCryptoPasswordDelegate(
           const GURL& url);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_