Port custom_tabs_client from GYP to GN

third_party/custom_tabs_client/BUILD.gn

+# Copyright 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.
+
+import("//build/config/android/rules.gni")
+
+android_resources("chrome_tabs_client_example_apk_resources") {
+  resource_dirs = [ "src/Application/src/main/res" ]
+  android_manifest = "src/Application/src/main/AndroidManifest.xml"
+  custom_package = "org.chromium.customtabsclient"
+}
+
+android_apk("custom_tabs_client_example_apk") {
+  DEPRECATED_java_in_dir = "src/Application/src/main/java"
+  android_manifest = "src/Application/src/main/AndroidManifest.xml"
+  apk_name = "CustomTabsClientExample"
+  deps = [
+    ":chrome_tabs_client_example_apk_resources",
+    ":custom_tabs_support_lib",
+    ":custom_tabs_client_shared_lib",
+  ]
+  chromium_code = false
+}
+
+android_library("custom_tabs_client_shared_lib") {
+  DEPRECATED_java_in_dir =
+      "src/shared/src/main/java/org/chromium/customtabsclient/shared"
+  deps = [
+    ":custom_tabs_support_lib",
+  ]
+}
+
+android_library("custom_tabs_support_lib") {
+  DEPRECATED_java_in_dir = "src/customtabs/src"
+  deps = [
+    "//third_party/android_tools:android_support_annotations_javalib",
+  ]
+  srcjar_deps = [ ":chrome_custom_tabs_service_aidl" ]
+}
+
+android_aidl("chrome_custom_tabs_service_aidl") {
+  interface_file = "common.aidl"
+
+  java_in_dir = "src/customtabs/src/android/support/customtabs"
+  sources = [
+    "$java_in_dir/ICustomTabsCallback.aidl",
+    "$java_in_dir/ICustomTabsService.aidl",
+  ]
+}