Android: Add java_deobfuscate as data_deps when needed

Ran into a bot failure where the tool didn't exist for vr tests:
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8930637010680307008/+/steps/chrome_public_test_vr_apk_on_Android_device_Nexus_5X__retry_with_patch_/0/stdout

Change-Id: I815a5d591b7ef123449e545cd643948d5fa87fd0
Reviewed-on: https://chromium-review.googlesource.com/c/1319854
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605760}

build/config/android/rules.gni

@@ -3168,6 +3168,7 @@ if (enable_java_templates) {
         data = [
           "$_final_apk_path.mapping",
         ]
+        data_deps += [ "//build/android/stacktrace:java_deobfuscate" ]
       }
 
       dist_ijar_path = _dist_ijar_path