Add GN build rules to allow java_assertion_enabler to enable Java asserts.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 834 matching lines @@
     # This dependency here only exists to allow GN to discover the
     # fuzzer_test target there.
     deps += [ "//chrome/browser/media:cast_remoting_connector_fuzzer" ]
   }
 
   if (enable_nacl) {
     deps += [ "//native_client_sdk/src:nacl_core_sdk" ]
   }
 
   if (is_android) {
-    deps += [
-      "//build/android/gyp/test:hello_world",
-      "//build/android/incremental_install:bootstrap_java",

[agrieve, 2016/11/14 19:00:57]

note: I said this was fine to remove as well since it's also referenced by
targets (in a similar way to java_assertion_enabler)

-      "//build/android/java_assertion_enabler",
-    ]
+    deps += [ "//build/android/gyp/test:hello_world" ]
   }
 
   if (is_linux && use_ozone) {
     deps += [
       "//headless",
       "//headless:headless_tests",
     ]
   }
 
   if (!is_chromecast && (is_android || is_linux || is_chromeos)) {
@@ skipping 206 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }