[Android] Add an out-of-app instrumentation driver APK.

testing/android/on_device_instrumentation.gyp

+# 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.
+
+{
+  'conditions': [
+    ['OS=="android"', {
+      'variables' : {
+        'driver_apk_name': 'OnDeviceInstrumentationDriver',
+        'driver_apk_path': '<(PRODUCT_DIR)/apks/<(driver_apk_name).apk'
+      },
+      'targets': [
+        {
+          'target_name': 'reporter_java',
+          'type': 'none',
+          'dependencies': ['../../base/base.gyp:base_java'],
+          'variables': {
+            'java_in_dir': '../../testing/android/reporter/java',
+          },
+          'includes': [
+            '../../build/java.gypi',
+          ],
+        },
+        {
+          'target_name': 'broker_java',
+          'type': 'none',
+          'variables': {
+            'java_in_dir': '../../testing/android/broker/java',
+          },
+          'includes': [
+            '../../build/java.gypi',
+          ],
+        },
+        {
+          'target_name': 'driver_apk',
+          'type': 'none',
+          'dependencies': [
+            'broker_java',
+            'reporter_java',
+            'appurify_support.gyp:appurify_support_java',
+          ],
+          'variables': {
+            'apk_name': '<(driver_apk_name)',
+            'final_apk_path': '<(driver_apk_path)',
+            'java_in_dir': '../../testing/android/driver/java',
+          },
+          'includes': [
+            '../../build/java_apk.gypi',
+          ],
+        },
+        {
+          'target_name': 'require_driver_apk',

[cjhopman, 2015/04/24 01:31:54]

This could probably use a short comment about what it's doing

[jbudorick, 2015/04/24 19:58:47]

Done.

+          'type': 'none',
+          'actions': [
+            {
+              'action_name': 'require_<(driver_apk_name)',
+              'message': 'Making sure <(driver_apk_path) has been built.',
+              'variables': {
+                'required_file': '<(PRODUCT_DIR)/driver_apk/<(driver_apk_name).apk.required',
+              },
+              'inputs': [
+                '<(driver_apk_path)',
+              ],
+              'outputs': [
+                '<(required_file)',
+              ],
+              'action': [
+                'python', '../../build/android/gyp/touch.py', '<(required_file)',
+              ],
+            },
+          ],
+        },
+      ],
+    }],
+  ],
+}