Store NavigationIntext in CRWWKNavigationStates.

ios/web/web_state/ui/crw_wk_navigation_states.h

 // 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_WEB_WEB_STATE_UI_CRW_WK_NAVIGATION_STATES_H_
 #define IOS_WEB_WEB_STATE_UI_CRW_WK_NAVIGATION_STATES_H_
 
+#include <memory>
+
 #import <Foundation/Foundation.h>
 #import <WebKit/WebKit.h>
 
 namespace web {
 
+class NavigationContextImpl;
+
 // State of in-flight WKNavigation objects.
 enum class WKNavigationState : int {
   // Navigation does not exist.
   NONE = 0,
   // WKNavigation returned from |loadRequest:|, |goToBackForwardListItem:|,
   // |loadFileURL:allowingReadAccessToURL:|, |loadHTMLString:baseURL:|,
   // |loadData:MIMEType:characterEncodingName:baseURL:|, |goBack|, |goForward|,
   // |reload| or |reloadFromOrigin|.
   REQUESTED,
   // WKNavigation passed to |webView:didStartProvisionalNavigation:|.
   STARTED,
   // WKNavigation passed to
   // |webView:didReceiveServerRedirectForProvisionalNavigation:|.
   REDIRECTED,
   // WKNavigation passed to |webView:didFailProvisionalNavigation:|.
   PROVISIONALY_FAILED,
   // WKNavigation passed to |webView:didCommitNavigation:|.
   COMMITTED,
   // WKNavigation passed to |webView:didFinishNavigation:|.
   FINISHED,
   // WKNavigation passed to |webView:didFailNavigation:withError:|.
   FAILED,
 };
 
 }  // namespace web
 
-// Stores states for WKNavigation objects. Allows lookign up for last added
-// navigation object.
+// Stores states and navigation contexts for WKNavigation objects.
+// Allows looking up for last added navigation object.
 @interface CRWWKNavigationStates : NSObject
 
 // Adds a new navigation if it was not added yet. If navigation was already
 // added then updates state for existing navigation. Updating state does not
 // affect the result of |lastAddedNavigation| method. New added navigations
 // should have WKNavigationState::REQUESTED, WKNavigationState::STARTED or
 // WKNavigationState::COMMITTED state. Passed |navigation| will be help as weak
 // reference and will not be retained. No-op if |navigation| is null.
 - (void)setState:(web::WKNavigationState)state
     forNavigation:(WKNavigation*)navigation;
 
 // Removes given |navigation|. Fails if |navigation| does not exist. No-op if
 // |navigation| is null.
 - (void)removeNavigation:(WKNavigation*)navigation;
 
+// Adds a new navigation if it was not added yet. If navigation was already
+// added then updates context for existing navigation. Updating context does not
+// affect the result of |lastAddedNavigation| method. Passed |navigation| will

[kkhorimoto, 2017/04/25 13:29:55]

Optional: I don't think "Passed" is really necessary here since |navigation|
with the lines unambiguously refers to the passed argument.  Same goes for the
similar comment above.

[Eugene But (OOO till 7-30), 2017/04/25 21:02:58]

Done.

+// be held as weak reference and will not be retained. No-op if |navigation| is
+// null.
+- (void)setContext:(std::unique_ptr<web::NavigationContextImpl>)context
+     forNavigation:(WKNavigation*)navigation;
+
+// Returns context if one was previously associated with given |navigation|.
+// Returns null if |navigation| is null.
+- (web::NavigationContextImpl*)contextForNavigation:(WKNavigation*)navigation;
+
 // WKNavigation which was added the most recently via |setState:forNavigation:|.
 // Updating navigation state via |setState:forNavigation:| does not change the
 // last added navigation. Returns nil if there are no stored navigations.
 - (WKNavigation*)lastAddedNavigation;
 
 // State of WKNavigation which was added the most recently via
 // |setState:forNavigation:|. WKNavigationState::NONE if CRWWKNavigationStates
 // is empty.
 - (web::WKNavigationState)lastAddedNavigationState;
 
 @end
 
 #endif  // IOS_WEB_WEB_STATE_UI_CRW_WK_NAVIGATION_STATES_H_