Make session restore understand that tabs have multiple SessionStorageNamespaces.

chrome/test/base/in_process_browser_test.h

Index: chrome/test/base/in_process_browser_test.h
diff --git a/chrome/test/base/in_process_browser_test.h b/chrome/test/base/in_process_browser_test.h
index 9b2593472e09477f25f20b037b5a50d0ed55f973..c4db114811aefc910e42b53e05ec43d622acc8d0 100644
--- a/chrome/test/base/in_process_browser_test.h
+++ b/chrome/test/base/in_process_browser_test.h
@@ -80,6 +80,19 @@ class RuleBasedHostResolverProc;
 // InProcessBrowserTest disables the sandbox when running.
 //
 // See ui_test_utils for a handful of methods designed for use with this class.
+//
+// It's possible to write browser tests that span a restart by splitting each
+// run of the browser process into a separate test. Example:
+//
+// IN_PROC_BROWSER_TEST_F(Foo, PRE_Bar) {
+//   do something
+// }
+//
+// IN_PROC_BROWSER_TEST_F(Foo, Bar) {
+//   verify something persisted from before
+// }
+//
+//  This is recursive, so PRE_PRE_Bar would run before PRE_BAR.
 class InProcessBrowserTest : public BrowserTestBase {
  public:
   InProcessBrowserTest();