Add a performance test for launching DocumentsUI.
The test launches the DocumentsUI as picker, then waits until the
main thread idles, which guarantees that roots are loaded and UI
rendered.
It confirms, that the recent system cache improves cold start
performance by around 24% on my configuration (from 1685ms to 1357ms).
Bug: 27370274
Change-Id: I738202ea434a7bfe7080fc0994f636ef0e7847cd
diff --git a/app-perf-tests/AndroidManifest.xml b/app-perf-tests/AndroidManifest.xml
new file mode 100644
index 0000000..1c3ed80
--- /dev/null
+++ b/app-perf-tests/AndroidManifest.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+ package="com.android.documentsui.appperftests">
+
+ <application>
+ <uses-library android:name="android.test.runner" />
+
+ <activity
+ android:name="com.android.documentsui.LauncherActivity" />
+ </application>
+
+ <!-- This package instrumentates itself, so the DocumentsUI process can be killed without
+ killing the testing package. -->
+ <instrumentation android:name="android.test.InstrumentationTestRunner"
+ android:targetPackage="com.android.documentsui.appperftests"
+ android:label="App performance tests for DocumentsUI" />
+
+</manifest>