Handle mac trackpad zoom via GesturePinch events

chrome/browser/ui/cocoa/browser_window_controller.h

 // Copyright (c) 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_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C controller for the Browser
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single toolbar and, by virtue of being a
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   // away from the bottom/top or resized (or zoomed).
   CGFloat windowTopGrowth_;
   CGFloat windowBottomGrowth_;
 
   // YES only if we're shrinking the window from an apparent zoomed state (which
   // we'll only do if we grew it to the zoomed state); needed since we'll then
   // restrict the amount of shrinking by the amounts specified above. Reset to
   // NO on growth.
   BOOL isShrinkingFromZoomed_;
 
-  // The raw accumulated zoom value and the actual zoom increments made for an
-  // an in-progress pinch gesture.
-  CGFloat totalMagnifyGestureAmount_;
-  NSInteger currentZoomStepDelta_;
-
   // The view controller that manages the incognito badge or the multi-profile
   // avatar button. Depending on whether the --new-profile-management flag is
   // used, the multi-profile button can either be the avatar's icon badge or a
   // button with the profile's name. If the flag is used, the button is always
   // shown, otherwise the view will always be in the view hierarchy but will
   // be hidden unless it's appropriate to show it (i.e. if there's more than
   // one profile).
   base::scoped_nsobject<AvatarBaseController> avatarButtonController_;
 
   // Lazily created view which draws the background for the floating set of bars
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 // positioned relative to.
 - (NSRect)omniboxPopupAnchorRect;
 
 // Force a layout of info bars.
 - (void)layoutInfoBars;
 
 @end  // @interface BrowserWindowController (TestingAPI)
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_