[WebView] Add an isolate file to run the WebView Layout tests.

android_webview/tools/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")
 import("//testing/test.gni")
 
 # Mark all targets as test only.
 testonly = true
 
@@ skipping 27 matching lines @@
   apk_under_test = ":system_webview_shell_apk"
   android_manifest = "PageCycler/AndroidManifest.xml"
   DEPRECATED_java_in_dir = "PageCycler/src"
   deps = [
     "//base:base_java",
     "//base:base_java_test_support",
     "//content/public/android:content_java",
     "//content/public/test/android:content_java_test_support",
     "//testing/android/reporter:reporter_java",
   ]
+  additional_apks = [ "//android_webview:system_webview_apk" ]
 }
 
 # GYP: //android_webview/android_webview_shell.gypi:system_webview_shell_layout_test_apk
 instrumentation_test_apk("system_webview_shell_layout_test_apk") {
   apk_name = "SystemWebViewShellLayoutTest"
   apk_under_test = ":system_webview_shell_apk"
   android_manifest = "WebViewShellTest/AndroidManifest.xml"
   DEPRECATED_java_in_dir = "WebViewShellTest/src"
   isolate_file = "../system_webview_shell_test_apk.isolate"
   deps = [
     "//base:base_java",
     "//base:base_java_test_support",
     "//testing/android/reporter:reporter_java",
   ]
+  additional_apks = [ "//android_webview:system_webview_apk" ]
 }