Separates PreviousSessionInfo testing interface

ios/chrome/browser/metrics/previous_session_info_private.h

Index: ios/chrome/browser/metrics/previous_session_info_private.h
diff --git a/ios/chrome/browser/metrics/previous_session_info_private.h b/ios/chrome/browser/metrics/previous_session_info_private.h
new file mode 100644
index 0000000000000000000000000000000000000000..954c20c34b653436565c61a61dd416e93c50f8ba
--- /dev/null
+++ b/ios/chrome/browser/metrics/previous_session_info_private.h
@@ -0,0 +1,20 @@
+// 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 IOS_CHROME_BROWSER_METRICS_PREVIOUS_SESSION_INFO_PRIVATE_H_
+#define IOS_CHROME_BROWSER_METRICS_PREVIOUS_SESSION_INFO_PRIVATE_H_
+
+@interface PreviousSessionInfo (TestingOnly)
+
+// Redefined to be read-write.
+@property(nonatomic, assign) BOOL didSeeMemoryWarningShortlyBeforeTerminating;
+
+// Redefined to be read-write.
+@property(nonatomic, assign) BOOL isFirstSessionAfterUpgrade;

[Olivier, 2016/05/26 12:18:30]

is this needed ?

[gambard, 2016/05/26 12:22:14]

Used downstream.

+
++ (void)resetSharedInstanceForTesting;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_METRICS_PREVIOUS_SESSION_INFO_PRIVATE_H_