Build the Flutter engine for android_debug and then the dist target

scripts/slave/recipes/flutter/engine.py

 # Copyright 2016 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 contextlib
 
 DEPS = [
   'depot_tools/bot_update',
   'depot_tools/gclient',
   'file',
@@ skipping 107 matching lines @@
 def BuildLinuxAndroidArm(api):
   out_paths = [
     'apks/SkyShell.apk',
     'flutter.jar',
     'flutter.mojo',
     'gen/sky/shell/shell/shell/libs/armeabi-v7a/libsky_shell.so',
     'icudtl.dat',
     'gen/sky/shell/shell/classes.dex.jar',
   ]
   RunGN(api, '--android')
+  Build(api, 'android_debug')
   Build(api, 'android_debug', ':dist')
   UploadArtifacts(api, 'android-arm', [
     'build/android/ant/chromium-debug.keystore',
   ] + AddPathPrefix(api, 'out/android_debug', out_paths))
   UploadArtifacts(api, 'android-arm', [
       'out/android_debug/libsky_shell.so'
   ], archive_name='symbols.zip')
 
   # Build and upload engines for the runtime modes that use AOT compilation.
   for runtime_mode in ['profile', 'release']:
@@ skipping 166 matching lines @@
       BuildIOS(api)
 
 
 def GenTests(api):
   # A valid commit to flutter/engine, to make the gsutil urls look real.
   for platform in ('mac', 'linux'):
     yield (api.test(platform) + api.platform(platform, 64)
         + api.properties(mastername='client.flutter',
               buildername='%s Engine' % platform.capitalize(),
               slavename='fake-m1', clobber=''))