precache: Move the java files into //components/precache/android

components/precache/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")
 
-assert(is_android)
-
-android_resources("android_data_chart_java_resources") {
-  custom_package = "org.chromium.third_party.android"
-  resource_dirs = [ "java/res" ]
+# GYP: //components/precache.gypi:precache_java
+android_library("precache_java") {
+  deps = [
+    "//base:base_java",
+  ]
+  DEPRECATED_java_in_dir = "java/src"
 }
 
-android_library("android_data_chart_java") {
-  DEPRECATED_java_in_dir = "java/src"
+android_library("precache_javatests") {
   deps = [
-    ":android_data_chart_java_resources",
+    "//base:base_java_test_support",
+    ":precache_java",
   ]
+  DEPRECATED_java_in_dir = "javatests/src"
 }