Add an Android sample app for Telemetry tests.

The purpose of this app is to be launched and push other apps to
the background during Android telemetry tests. It is just a
super simple Android app.

BUG=586148

Review URL: https://codereview.chromium.org/1744423002

Cr-Commit-Position: refs/heads/master@{#380680}

BUILD.gn

@@ -282,6 +282,7 @@ group("both_gn_and_gyp") {
       "//third_party/smhasher:murmurhash3",
       "//tools/android:android_tools",
       "//tools/android:memconsumer",
+      "//tools/android:push_apps_to_background",
       "//tools/android/heap_profiler:heap_profiler_unittests",
       "//tools/android/kerberos/SpnegoAuthenticator:spnego_authenticator_apk",
       "//tools/cygprofile:cygprofile_unittests",

build/all.gyp

@@ -834,6 +834,7 @@
             '../third_party/WebKit/public/all.gyp:*',
             '../tools/android/android_tools.gyp:android_tools',
             '../tools/android/android_tools.gyp:memconsumer',
+            '../tools/android/android_tools.gyp:push_apps_to_background',
             '../tools/android/findbugs_plugin/findbugs_plugin.gyp:findbugs_plugin_test',
             '../tools/cygprofile/cygprofile.gyp:cygprofile_unittests',
             '../ui/android/ui_android.gyp:ui_android_unittests',

build/gn_migration.gypi

@@ -233,6 +233,7 @@
             '../third_party/WebKit/Source/wtf/wtf_tests.gyp:wtf_unittests_apk',
             '../tools/android/heap_profiler/heap_profiler.gyp:heap_profiler_unittests_apk',
             '../tools/android/android_tools.gyp:memconsumer',
+            '../tools/android/android_tools.gyp:push_apps_to_background',
             '../tools/imagediff/image_diff.gyp:image_diff#host',
             '../third_party/catapult/telemetry/telemetry.gyp:bitmaptools#host',
             '../ui/android/ui_android.gyp:ui_android_unittests_apk',

tools/android/BUILD.gn

@@ -79,3 +79,11 @@ group("audio_focus_grabber") {
     "//tools/android/audio_focus_grabber:audio_focus_grabber_apk",
   ]
 }
+
+# GYP: //tools/android/android_tools.gyp:push_apps_to_background
+group("push_apps_to_background") {
+  testonly = true
+  deps = [
+    "//tools/android/push_apps_to_background:push_apps_to_background_apk",
+  ]
+}

tools/android/android_tools.gyp

@@ -85,5 +85,13 @@
         'audio_focus_grabber/audio_focus_grabber.gyp:audio_focus_grabber_apk',
       ],
     },
+    {
+      # GN: //tools/android:push_apps_to_background
+      'target_name': 'push_apps_to_background',
+      'type': 'none',
+      'dependencies': [
+        'push_apps_to_background/push_apps_to_background.gyp:push_apps_to_background_apk',
+      ],
+    },
   ],
 }

tools/android/push_apps_to_background/AndroidManifest.xml

@@ -0,0 +1,29 @@
+<!--
+ * Copyright 2016 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.
+-->
+
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.chromium.push_apps_to_background"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="23" />
+
+    <application
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@android:style/Theme.Light" >
+        <activity
+            android:name="org.chromium.push_apps_to_background.PushAppsToBackgroundActivity"
+            android:label="@string/title_activity_push_apps_to_background"
+            android:exported="true">
+        <intent-filter>
+            <action android:name="android.intent.action.MAIN" />
+            <category android:name="android.intent.category.LAUNCHER" />
+        </intent-filter>
+        </activity>
+    </application>
+</manifest>

tools/android/push_apps_to_background/BUILD.gn

@@ -0,0 +1,23 @@
+# Copyright 2016 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")
+import("//testing/test.gni")
+
+# Mark all targets as test only.
+testonly = true
+
+android_apk("push_apps_to_background_apk") {
+  apk_name = "PushAppsToBackground"
+  java_files = [ "src/org/chromium/push_apps_to_background/PushAppsToBackgroundActivity.java" ]
+  android_manifest = "AndroidManifest.xml"
+  deps = [
+    ":push_apps_to_background_apk_resources",
+  ]
+}
+
+android_resources("push_apps_to_background_apk_resources") {
+  resource_dirs = [ "res" ]
+  custom_package = "org.chromium.push_apps_to_background"
+}

tools/android/push_apps_to_background/OWNERS

@@ -0,0 +1,2 @@
+mikecase@chromium.org
+perezju@chromium.org

tools/android/push_apps_to_background/push_apps_to_background.gyp

@@ -0,0 +1,21 @@
+# Copyright 2016 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.
+{
+  'targets': [
+    # GN: //tools/android/push_apps_to_background:push_apps_to_background_apk
+    {
+      'target_name': 'push_apps_to_background_apk',
+      'type': 'none',
+      'variables': {
+        'apk_name': 'PushAppsToBackground',
+        'java_in_dir': '.',
+        'resource_dir': 'res',
+        'android_manifest_path': 'AndroidManifest.xml',
+      },
+      'includes': [
+        '../../../build/java_apk.gypi',
+      ],
+    },
+  ],
+}

tools/android/push_apps_to_background/res/layout/activity_push_apps_to_background.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2016 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.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:gravity="center">
+    <TextView
+        android:id="@+id/text_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="@string/push_apps_to_background_message" />
+</LinearLayout>

tools/android/push_apps_to_background/res/values/strings.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2016 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.
+-->
+
+<resources>
+    <string name="app_name">Push Apps To Background</string>
+    <string name="push_apps_to_background_message">
+        "<b>What is my purpose?</b>\n
+         <i>You push apps to the background.</i>\n
+         <b>Oh my God</b>."
+    </string>
+    <string name="title_activity_push_apps_to_background">Push Apps To Background</string>
+</resources>

tools/android/push_apps_to_background/src/org/chromium/push_apps_to_background/PushAppsToBackgroundActivity.java

@@ -0,0 +1,21 @@
+// Copyright 2016 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.
+
+package org.chromium.push_apps_to_background;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+/**
+ * This activity is used in performance tests to push other apps
+ * to the background while running automated user stories.
+ */
+public class PushAppsToBackgroundActivity extends Activity {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_push_apps_to_background);
+    }
+}