Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/public/crw_navigation_manager_serialization.h

Index: ios/web/public/crw_navigation_manager_serialization.h
diff --git a/ios/web/public/crw_navigation_manager_serialization.h b/ios/web/public/crw_navigation_manager_serialization.h
new file mode 100644
index 0000000000000000000000000000000000000000..1aec5e6009825606426aeeac18bd629448bc49e0
--- /dev/null
+++ b/ios/web/public/crw_navigation_manager_serialization.h
@@ -0,0 +1,34 @@
+// Copyright 2015 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_WEB_PUBLIC_CRW_NAVIGATION_MANAGER_SERIALIZATION_H_
+#define IOS_WEB_PUBLIC_CRW_NAVIGATION_MANAGER_SERIALIZATION_H_
+
+#import <Foundation/Foundation.h>
+
+@class CRWSessionCertificatePolicyManager;
+
+// NSCoding-compliant class used to serialize NavigationManager's persisted
+// properties.
+@interface CRWNavigationManagerSerialization : NSObject<NSCoding>

[Eugene But (OOO till 7-30), 2017/01/25 16:03:38]

Is there //content analogue for this public class?

[kkhorimoto, 2017/01/26 07:19:10]

It looks like content uses SessionTab as an analogous class.  I've added a TODO
to investigate folding our iOS sessions code into the upstream sessions
component so we can reuse some code.

+
+@property(nonatomic, copy) NSString* tabID;
+@property(nonatomic, copy) NSString* openerID;
+@property(nonatomic, getter=isOpenedByDOM) BOOL openedByDOM;
+@property(nonatomic, assign) NSInteger openerNavigationIndex;
+@property(nonatomic, copy) NSString* windowName;
+@property(nonatomic, assign) NSInteger currentNavigationIndex;
+@property(nonatomic, assign) NSInteger previousNavigationIndex;
+@property(nonatomic, assign) NSTimeInterval lastVisitedTimestamp;
+// TODO(crbug.com/454984): |entries| currently contains CRWSessionEntries.  Once
+// NavigationItemImpls are encoded/decoded using CRWNavigationItemSerializations
+// (analogous to the approach taken with NavigationManager), this will
+// become an array of CRWNavigationItemSerializations.
+@property(nonatomic, copy) NSArray* entries;
+@property(nonatomic, retain)
+    CRWSessionCertificatePolicyManager* sessionCertificatePolicyManager;
+
+@end
+
+#endif  // IOS_WEB_PUBLIC_CRW_NAVIGATION_MANAGER_SERIALIZATION_H_