Create headerHeightForTab in TabHeadersDelegate.

ios/chrome/browser/ui/side_swipe/side_swipe_controller.h

 // 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_CHROME_BROWSER_UI_SIDE_SWIPE_SIDE_SWIPE_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_SIDE_SWIPE_SIDE_SWIPE_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #include "ios/chrome/browser/infobars/infobar_container_ios.h"
@@ skipping 45 matching lines @@
 // -selectedTabChanged on the toolbar only if |newSelection| is YES.
 - (void)displayTab:(Tab*)tab isNewSelection:(BOOL)newSelection;
 // Check the invariant of "toolbar in front of infobar container which
 // is in front of content area." This DCHECK happens if addSubview and/or
 // insertSubview messed up the view ordering earlier.
 - (BOOL)verifyToolbarViewPlacementInView:(UIView*)views;
 // Controls the visibility of views such as the findbar, infobar and voice
 // search bar.
 - (void)updateAccessoryViewsForSideSwipeWithVisibility:(BOOL)visible;
 // Returns the height of the header view for the tab model's current tab.
-- (CGFloat)headerHeight;
+- (CGFloat)headerHeightForCurrentTab;
 // Returns |YES| if side swipe should be blocked from initiating, such as when
 // voice search is up, or if the tools menu is enabled.
 - (BOOL)preventSideSwipe;
 @end
 
 // Controls how an edge gesture is processed, either as tab change or a page
 // change.  For tab changes two full screen CardSideSwipeView views are dragged
 // across the screen. For page changes the SideSwipeControllerDelegate
 // |contentView| is moved across the screen and a SideSwipeNavigationView is
 // shown in the remaining space.
@@ skipping 19 matching lines @@
 
 // Returns |NO| if the device should not rotate.
 - (BOOL)shouldAutorotate;
 
 // Resets the swipeDelegate's contentView frame origin x position to zero.
 - (void)resetContentView;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_SIDE_SWIPE_SIDE_SWIPE_CONTROLLER_H_