Port android_webview_shell.gyp to GN.

BUILD.gn

 # Copyright (c) 2013 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 is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 293 matching lines @@
         "//components/cronet/android:cronet_test_apk",
         "//components/cronet/android:cronet_test_instrumentation_apk",
         "//components/cronet/android:cronet_unittests",
       ]
     }
 
     if (!is_chromecast) {
       deps += [
         "//android_webview",
         "//android_webview/test",
+        "//android_webview/tools",
         "//chrome/android:chrome_junit_tests",
         "//chrome/android:chrome_public_apk",
         "//chrome/android:chrome_public_test_apk",
         "//chrome/test/chromedriver/test/webview_shell:chromedriver_webview_shell_apk",
         "//third_party/custom_tabs_client:custom_tabs_client_example_apk",
       ]
     }
 
     if (target_cpu != "x64") {
       deps += [ "//third_party/android_platform:android_relocation_packer_unittests($host_toolchain)" ]
@@ skipping 534 matching lines @@
       ]
 
       if (target_cpu == "x86") {
         deps += [ "//chrome/tools/crash_service:crash_service_win64" ]
       }
     } else {
       deps += [ "//breakpad:minidump_stackwalk($host_toolchain)" ]
     }
   }
 }