Initial UsageStatsDatabase Perf tests

A suite of simple performance test for UsageStatsDatabase. They measure
the time it take to write and read UsageEvents to and from a file.

Bug: 110428559
Test: atest UsageStatsPerfTests
Change-Id: If1558515e1da9e22fb56bc13f8e89c10c51a1625
diff --git a/tests/UsageStatsPerfTests/AndroidManifest.xml b/tests/UsageStatsPerfTests/AndroidManifest.xml
new file mode 100644
index 0000000..596a79c
--- /dev/null
+++ b/tests/UsageStatsPerfTests/AndroidManifest.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+        package="com.android.frameworks.perftests.usage">
+    <uses-sdk
+            android:minSdkVersion="21" />
+    <uses-permission android:name="android.permission.DUMP" />
+    <uses-permission android:name="android.permission.FORCE_STOP_PACKAGES" />
+
+    <application>
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <instrumentation android:name="android.support.test.runner.AndroidJUnitRunner"
+                     android:targetPackage="com.android.frameworks.perftests.usage"/>
+</manifest>