Make Autofill work again on iPads running iOS 9.

ios/chrome/browser/autofill/form_input_accessory_view_controller.h

 // Copyright 2014 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_AUTOFILL_FORM_INPUT_ACCESSORY_VIEW_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_AUTOFILL_FORM_INPUT_ACCESSORY_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/autofill/form_input_accessory_view_delegate.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 
 @protocol CRWWebViewProxy;
 
 namespace autofill {
 extern NSString* const kFormSuggestionAssistButtonPreviousElement;
 extern NSString* const kFormSuggestionAssistButtonNextElement;
 extern NSString* const kFormSuggestionAssistButtonDone;
+extern CGFloat const kInputAccessoryHeight;
 }  // namespace autofill
 
 @protocol FormInputAccessoryViewProvider;
 @class FormInputAccessoryViewController;
 
 // Block type to indicate that a FormInputAccessoryViewProvider has an accessory
 // view to provide.
 typedef void (^AccessoryViewAvailableCompletion)(
     BOOL inputAccessoryViewAvailable);
 
@@ skipping 44 matching lines @@
 // interacting with a form. Also handles hiding and showing the default
 // accessory view elements.
 @interface FormInputAccessoryViewController
     : NSObject<CRWWebStateObserver, FormInputAccessoryViewDelegate>
 
 // Initializes a new controller with the specified |providers| of input
 // accessory views.
 - (instancetype)initWithWebState:(web::WebState*)webState
                        providers:(NSArray*)providers;
 
+// Notifies the controller that the owning tab was shown.
+- (void)wasShown;
+
+// Notifies the controller that the owning tab was hidden.
+- (void)wasHidden;
+
 // Hides the default input accessory view and replaces it with one that shows
 // |customView| and form navigation controls.
 - (void)showCustomInputAccessoryView:(UIView*)customView;
 
 // Restores the default input accessory view, removing (if necessary) any
 // previously-added custom view.
 - (void)restoreDefaultInputAccessoryView;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_AUTOFILL_FORM_INPUT_ACCESSORY_VIEW_CONTROLLER_H_