Port some of android_tools.gyp to GN

Port the minimal amount of android_tools.gyp to GN for orderfile_generator.py to
work.

BUG=535071, 531278

Review URL: https://codereview.chromium.org/1362753003

Cr-Commit-Position: refs/heads/master@{#350712}
diff --git a/BUILD.gn b/BUILD.gn
index c367108..93fdbd4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -222,6 +222,7 @@
       "//chrome/android:chrome_public_test_apk",
       "//chrome/test/chromedriver/test/webview_shell:chromedriver_webview_shell_apk",
       "//third_party/errorprone:chromium_errorprone",
+      "//tools/android:android_tools",
       "//tools/imagediff($host_toolchain)",
 
       # TODO(GYP): Remove these when the components_unittests work.