Android: Fix missing dep from compile_resources -> sdk jar

Can repro the failure via:
  cd out/Debug
  rm gen/arsc/apks/MonochromePublicTestAr.ap_
  rm lib.java/third_party/android_system_sdk/android_system.jar
  ninja gen/arsc/apks/MonochromePublicTestAr.ap_

Change-Id: I6885219d272510ec024263a3567fb27acf68050f
Reviewed-on: https://chromium-review.googlesource.com/1205500Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588876}

build/config/android/rules.gni

@@ -2171,6 +2171,11 @@ if (enable_java_templates) {
                ":$_merge_manifest_target",
                ":$_build_config_target",
              ]
+      if (defined(invoker.alternative_android_sdk_dep)) {
+        deps += [ invoker.alternative_android_sdk_dep ]
+      } else {
+        deps += [ "//third_party/android_tools:android_sdk_java" ]
+      }
       if (defined(invoker.shared_resources_whitelist_target)) {
         _whitelist_gen_dir =
             get_label_info(invoker.shared_resources_whitelist_target,