Add ios_web_view_shell_egtests target and accessibility labels to shell.

ios/web_view/shell/shell_view_controller.m

 // 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.
 
 #import "ios/web_view/shell/shell_view_controller.h"
 
 #import <MobileCoreServices/MobileCoreServices.h>
 
 #import "ios/web_view/public/cwv.h"
 #import "ios/web_view/public/cwv_html_element.h"
 #import "ios/web_view/public/cwv_web_view.h"
 #import "ios/web_view/shell/translate_controller.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 // Externed accessibility identifier.
+NSString* const kWebViewShellBackButtonAccessibilityLabel = @"Back";
+NSString* const kWebViewShellForwardButtonAccessibilityLabel = @"Forward";
+NSString* const kWebViewShellAddressFieldAccessibilityLabel = @"Address field";
 NSString* const kWebViewShellJavaScriptDialogTextFieldAccessibiltyIdentifier =
     @"WebViewShellJavaScriptDialogTextFieldAccessibiltyIdentifier";
 
 @interface ShellViewController ()<CWVNavigationDelegate,
                                   CWVUIDelegate,
                                   UITextFieldDelegate>
 // Container for |webView|.
 @property(nonatomic, strong) UIView* containerView;
 // Text field used for navigating to URLs.
 @property(nonatomic, strong) UITextField* field;
@@ skipping 52 matching lines @@
                                    kButtonCount * kButtonSize - 10,
                                31)];
   [_field setDelegate:self];
   [_field setBackground:[[UIImage imageNamed:@"textfield_background"]
                             resizableImageWithCapInsets:UIEdgeInsetsMake(
                                                             12, 12, 12, 12)]];
   [_field setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
   [_field setKeyboardType:UIKeyboardTypeWebSearch];
   [_field setAutocorrectionType:UITextAutocorrectionTypeNo];
   [_field setClearButtonMode:UITextFieldViewModeWhileEditing];
+  [_field setAccessibilityLabel:kWebViewShellAddressFieldAccessibilityLabel];
 
   // Set up the toolbar buttons.
   // Back.
   UIButton* back = [UIButton buttonWithType:UIButtonTypeCustom];
   [back setImage:[UIImage imageNamed:@"toolbar_back"]
         forState:UIControlStateNormal];
   [back setFrame:CGRectMake(0, 0, kButtonSize, kButtonSize)];
   UIEdgeInsets insets = UIEdgeInsetsMake(5, 5, 4, 4);
   [back setImageEdgeInsets:insets];
   [back setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
   [back addTarget:self
                 action:@selector(back)
       forControlEvents:UIControlEventTouchUpInside];
+  [back setAccessibilityLabel:kWebViewShellBackButtonAccessibilityLabel];
 
   // Forward.
   UIButton* forward = [UIButton buttonWithType:UIButtonTypeCustom];
   [forward setImage:[UIImage imageNamed:@"toolbar_forward"]
            forState:UIControlStateNormal];
   [forward setFrame:CGRectMake(kButtonSize, 0, kButtonSize, kButtonSize)];
   [forward setImageEdgeInsets:insets];
   [forward setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
   [forward addTarget:self
                 action:@selector(forward)
       forControlEvents:UIControlEventTouchUpInside];
+  [forward setAccessibilityLabel:kWebViewShellForwardButtonAccessibilityLabel];
 
   // Stop.
   UIButton* stop = [UIButton buttonWithType:UIButtonTypeCustom];
   [stop setImage:[UIImage imageNamed:@"toolbar_stop"]
         forState:UIControlStateNormal];
   [stop setFrame:CGRectMake(2 * kButtonSize, 0, kButtonSize, kButtonSize)];
   [stop setImageEdgeInsets:insets];
   [stop setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
   [stop addTarget:self
                 action:@selector(stopLoading)
@@ skipping 201 matching lines @@
   // TODO(crbug.com/679895): Add some visual indication that the page load has
   // finished.
   [self updateToolbar];
 }
 
 - (void)webViewWebContentProcessDidTerminate:(CWVWebView*)webView {
   NSLog(@"webViewWebContentProcessDidTerminate");
 }
 
 @end