Persist sessionStorage on disk.

content/browser/dom_storage/dom_storage_context_impl.cc

Index: content/browser/dom_storage/dom_storage_context_impl.cc
diff --git a/content/browser/dom_storage/dom_storage_context_impl.cc b/content/browser/dom_storage/dom_storage_context_impl.cc
index 683e105d7d4587564208ed0abe0bd487c1195c76..e4bdc4e52180973b7b5c1f8ae2ed9544cec02b08 100644
--- a/content/browser/dom_storage/dom_storage_context_impl.cc
+++ b/content/browser/dom_storage/dom_storage_context_impl.cc
@@ -26,6 +26,7 @@ using webkit_database::DatabaseUtil;
 namespace {
 
 const char kLocalStorageDirectory[] = "Local Storage";
+const char kSessionStorageDirectory[] = "Session Storage";
 
 // TODO(michaeln): Fix the content layer api, FilePaths and
 // string16 origin_ids are just wrong. Then get rid of
@@ -86,7 +87,8 @@ DOMStorageContextImpl::DOMStorageContextImpl(
   context_ = new dom_storage::DomStorageContext(
       data_path.empty() ?
           data_path : data_path.AppendASCII(kLocalStorageDirectory),
-      FilePath(),  // Empty session storage directory.
+      data_path.empty() ?
+          data_path : data_path.AppendASCII(kSessionStorageDirectory),

[michaeln, 2012/05/16 08:10:55]

until we work out how the higher level session restore logic interfaces with
this lower level logic, and it's ready to utilize that interface, it'd probably
be good to keep this as an empty path... we can turn this on when things are
ready from end to end.

[marja, 2012/05/30 11:46:19]

I would have liked to put this "save session state" behind a command line flag,
but the information about command line flags seems to be so far away here...

I added BrowserContext::ShouldSaveSessionStorageOnDisk here, and the version
overwritten by ProfileImpl reads the command line flag. Wdyt?

       special_storage_policy,
       new DomStorageWorkerPoolTaskRunner(
           worker_pool,