Make instrumentation_test_apk depend on their apk_under_test.

build/config/android/rules.gni

Index: build/config/android/rules.gni
diff --git a/build/config/android/rules.gni b/build/config/android/rules.gni
index 669f64606f0bd8ffdcc47b6d929b00ba3ed00b39..cbcd4cce26ee06d1c19dc244534a9554f5349a05 100644
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -1972,6 +1972,7 @@ template("instrumentation_test_apk") {
 
       # Required by test runner to enumerate test list.
       ":${_apk_target_name}_dist_ijar",
+      invoker.apk_under_test,

[jbudorick, 2016/02/08 16:18:22]

We kind of do this implicitly already down in write_build_config
(https://code.google.com/p/chromium/codesearch#chromium/src/build/config/andro...)
but I'm fine with being more explicit about it.

[agrieve, 2016/02/09 16:42:18]

ahh, I see! I've changed that line to just depend on the build config. This
enables more concurrency (chrome and test apk can be packaged at the same time)

     ]
   }
 }