Add ios_web_view_shell_egtests target and accessibility labels to shell.

ios/web_view/shell/BUILD.gn

 # Copyright 2016 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("//tools/grit/repack.gni")
 import("//build/config/ios/rules.gni")
 
 ios_app_bundle("ios_web_view_shell") {
-  configs += [ "//build/config/compiler:enable_arc" ]
+  info_plist = "Info.plist"
+
   deps = [
-    "//base",
-    "//ios/web_view",
+    ":shell",
   ]
   bundle_deps = [
     ":resources",
     ":packed_resources",
   ]
-  info_plist = "Info.plist"
+
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("shell") {
   sources = [
     "shell_app_delegate.h",
     "shell_app_delegate.m",
     "shell_delegate.h",
     "shell_delegate.m",
     "shell_exe_main.m",
     "shell_view_controller.h",
     "shell_view_controller.m",
     "translate_controller.h",
     "translate_controller.m",
   ]
+
+  deps = [
+    "//base",
+    "//ios/web_view",
+  ]
+
   libs = [
     "CFNetwork.framework",
     "CoreFoundation.framework",
     "CoreGraphics.framework",
     "CoreText.framework",
     "Foundation.framework",
     "ImageIO.framework",
     "MobileCoreServices.framework",
     "Security.framework",
     "SystemConfiguration.framework",
     "UIKit.framework",
     "WebKit.framework",
     "resolv",
   ]
+
+  configs += [ "//build/config/compiler:enable_arc" ]
 }
 
 bundle_data("resources") {
   visibility = [ ":ios_web_view_shell" ]
   sources = [
     "Default-568h@2x.png",
     "textfield_background@2x.png",
     "toolbar_back@2x.png",
     "toolbar_forward@2x.png",
     "toolbar_stop@2x.png",
@@ skipping 19 matching lines @@
   public_deps = [
     ":repack_resources",
   ]
   sources = [
     "$target_gen_dir/web_view_resources.pak",
   ]
   outputs = [
     "{{bundle_resources_dir}}/{{source_file_part}}",
   ]
 }