Alternate NTP Mac: Push down overlay in presentation mode

chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.h

 // Copyright 2012 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 CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_OVERLAYABLE_CONTENTS_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_OVERLAYABLE_CONTENTS_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
@@ skipping 45 matching lines @@
   // only visible when the overlay is positioned right next to the omnibox.
   scoped_nsobject<NSView> topSeparatorView_;
 
   BrowserWindowController* windowController_;
 
   // The vertical offset between the top of the view and the active container.
   // This is used to push the active container below the bookmark bar. Normally
   // this is set to the height of the bookmark bar so that the bookmark bar is
   // not obscured.
   CGFloat activeContainerOffset_;
+
+  // The vertical offset between the top of the view and the overlay. This is
+  // used in presentation mode to push the overlay below the floating toolbar
+  // view.
+  CGFloat overlayContentsOffset_;
 }
 
 @property(readonly, nonatomic) NSView* activeContainer;
 @property(readonly, nonatomic) NSView* dropShadowView;
 @property(readonly, nonatomic) BOOL drawDropShadow;
 @property(assign, nonatomic) CGFloat activeContainerOffset;
+@property(assign, nonatomic) CGFloat overlayContentsOffset;
 
 // Initialization.
 - (id)initWithBrowser:(Browser*)browser
      windowController:(BrowserWindowController*)windowController;
 
 // Sets the current overlay and installs its WebContentsView into the view
 // hierarchy. Hides the active view. If |overlay| is NULL then closes the
 // current overlay and shows the active view.
 - (void)setOverlay:(content::WebContents*)overlay
             height:(CGFloat)height
        heightUnits:(InstantSizeUnits)heightUnits
     drawDropShadow:(BOOL)drawDropShadow;
 
 // Called when a tab with |contents| is activated, so that we can check to see
 // if it's the overlay being activated (and adjust internal state accordingly).
 - (void)onActivateTabWithContents:(content::WebContents*)contents;
 
 // Returns YES if the overlay contents is currently showing.
 - (BOOL)isShowingOverlay;
 
 - (InstantOverlayControllerMac*)instantOverlayController;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_OVERLAYABLE_CONTENTS_CONTROLLER_H_