[iOS] Add experimental new keyboard accessory view.

ios/chrome/browser/ui/toolbar/keyboard_accessory_view.h

 // Copyright 2017 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_TOOLBAR_KEYBOARD_ACCESSORY_VIEW_H_
 #define IOS_CHROME_BROWSER_UI_TOOLBAR_KEYBOARD_ACCESSORY_VIEW_H_
 
 #import <UIKit/UIKIt.h>
 
 // Delegate protocol for the KeyboardAccessoryView.
 @protocol KeyboardAccessoryViewDelegate
 
 // Notifies the delegate that the Voice Search button was pressed.
 - (void)keyboardAccessoryVoiceSearchTouchDown;
 
 // Notifies the delegate that a touch up occured in the the Voice Search button.
 - (void)keyboardAccessoryVoiceSearchTouchUpInside;
 
+// Notifies the delegate that a touch up occured in the the Camera Search
+// button.
+- (void)keyboardAccessoryCameraSearchTouchUpInside;
+
 // Notifies the delegate that a key with the title |title| was pressed.
 - (void)keyPressed:(NSString*)title;
 
 @end
 
 typedef NS_ENUM(NSInteger, KeyboardAccessoryViewMode) {
   VOICE_SEARCH = 0,
   KEY_SHORTCUTS
 };
 
@@ skipping 14 matching lines @@
 
 - (instancetype)initWithFrame:(CGRect)frame
                inputViewStyle:(UIInputViewStyle)inputViewStyle NS_UNAVAILABLE;
 
 // The mode in which the KeyboardAccessoryView is in.
 @property(nonatomic) KeyboardAccessoryViewMode mode;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_TOOLBAR_KEYBOARD_ACCESSORY_VIEW_H_