Update instrumentation tests to use PreTestHooks for policies

components/policy/android/BUILD.gn

Index: components/policy/android/BUILD.gn
diff --git a/components/policy/android/BUILD.gn b/components/policy/android/BUILD.gn
index 4d84602c3fe8c1620cb08dcfed1cd5bdfeba676e..b455f79d55691f043d6bf0d4b384d3185fad6dd5 100644
--- a/components/policy/android/BUILD.gn
+++ b/components/policy/android/BUILD.gn
@@ -14,10 +14,25 @@ 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",
   ]
 }