[ios] Adds a LocationBarController interface.

ios/shared/chrome/browser/ui/omnibox/location_bar_delegate.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_SHARED_CHROME_BROWSER_UI_OMNIBOX_LOCATION_BAR_DELEGATE_H_
+#define IOS_SHARED_CHROME_BROWSER_UI_OMNIBOX_LOCATION_BAR_DELEGATE_H_
+
+#import <Foundation/Foundation.h>
+
+namespace web {
+class WebState;
+}
+
+class ToolbarModel;
+
+// Delegate for LocationBarController objects.  Used to provide the location bar
+// a way to open URLs and otherwise interact with the browser.
+@protocol LocationBarDelegate
+- (void)loadGURLFromLocationBar:(const GURL&)url
+                     transition:(ui::PageTransition)transition;
+- (void)locationBarHasBecomeFirstResponder;
+- (void)locationBarHasResignedFirstResponder;
+- (void)locationBarBeganEdit;
+- (void)locationBarChanged;
+- (web::WebState*)getWebState;
+- (ToolbarModel*)toolbarModel;
+@end
+
+#endif  // IOS_SHARED_CHROME_BROWSER_UI_OMNIBOX_LOCATION_BAR_DELEGATE_H_