Add debugging_buildflags to generate_jni public_deps.

Bug: 799759
Change-Id: I57d860f897db5fbc477e1b67e8979a651768d052
Reviewed-on: https://chromium-review.googlesource.com/979610
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545799}

build/config/android/rules.gni

@@ -262,7 +262,15 @@ if (enable_java_templates) {
       if (!defined(public_deps)) {
         public_deps = []
       }
-      public_deps += [ ":$_foreach_target_name" ]
+      public_deps += [
+        ":$_foreach_target_name",
+
+        # This depends on debugging_buildflags indirectly through
+        # base/android/jni_android.h, which is part of the //base target.
+        # This can't depend directly on //base without causing a dependency
+        # cycle, though.
+        "//base:debugging_buildflags",
+      ]
       public_configs = [ ":jni_includes_${target_name}" ]
     }
   }