Update instrumentation tests to use PreTestHooks for policies

components/policy/android/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/android/rules.gni")
 
 _jni_sources = [
   "java/src/org/chromium/policy/PolicyConverter.java",
   "java/src/org/chromium/policy/CombinedPolicyProvider.java",
 ]
 
 # GYP: //components/components.gyp:policy_java
 android_library("policy_java") {
   deps = [
     "//base:base_java",
   ]
-  java_files = _jni_sources + [
-    "java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java",
-    "java/src/org/chromium/policy/AppRestrictionsProvider.java",
-    "java/src/org/chromium/policy/PolicyProvider.java",
+  java_files =
+      _jni_sources + [
+        "java/src/org/chromium/policy/AbstractAppRestrictionsProvider.java",
+        "java/src/org/chromium/policy/AppRestrictionsProvider.java",
+        "java/src/org/chromium/policy/PolicyProvider.java",
+      ]
+}
+
+# GYP: //components/components.gyp:policy_test_support_java
+android_library("policy_java_test_support") {
+  testonly = true
+  deps = [
+    "//base:base_java",
+    "//base:base_java_test_support",
+    ":policy_java",
+  ]
+  java_files = [
+    "javatests/src/org/chromium/policy/test/annotations/Policies.java",
+    "javatests/src/org/chromium/policy/test/PolicyData.java",
   ]
 }
 
 # GYP: //components/components.gyp:policy_jni_headers
 generate_jni("jni_headers") {
   visibility = [ "//components/policy/*" ]
   sources = _jni_sources
   jni_package = "policy"
 }