Port custom_tabs_client from GYP to GN

build/gn_migration.gypi

 # Copyright (c) 2015 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.
 
 # This file defines five targets that we are using to track the progress of the
 # GYP->GN migration:
 #
 # 'both_gn_and_gyp' lists what GN is currently capable of building and should
 # match the 'both_gn_and_gyp' target in //BUILD.gn.
 #
@@ skipping 294 matching lines @@
             #"//components/sync_driver:test_support",
             #"//components/user_manager",
             #"//components/wallpaper",
 
             '../content/content_shell_and_tests.gyp:content_shell_apk',
 
             '../third_party/WebKit/Source/platform/blink_platform_tests.gyp:blink_heap_unittests_apk',
             '../third_party/WebKit/Source/platform/blink_platform_tests.gyp:blink_platform_unittests_apk',
             '../third_party/WebKit/Source/web/web_tests.gyp:webkit_unit_tests_apk',
             '../third_party/WebKit/Source/wtf/wtf_tests.gyp:wtf_unittests_apk',
+            '../third_party/custom_tabs_client/custom_tabs_client.gyp:custom_tabs_client_example_apk',
             # TODO(GYP): Are these needed, or will they be pulled in automatically?
             #"//third_party/android_tools:android_gcm_java",
             #"//third_party/android_tools:uiautomator_java",
             #"//third_party/android_tools:android_support_v13_java",
             #"//third_party/android_tools:android_support_v7_appcompat_java",
             #"//third_party/android_tools:android_support_v7_mediarouter_java",
             #"//third_party/mesa",
             #"//third_party/mockito:mockito_java",
             #"//third_party/openmax_dl/dl",
             #"//ui/android:ui_java",
@@ skipping 378 matching lines @@
           'dependencies': [
             # TODO(GYP): All of these targets need to be ported over.
             '../components/components.gyp:policy_win64',
           ]
         }],
       ],
     },
   ]
 }