GN Incremental Install: Add support for running with instrumentation.

build/android/incremental_install/java/org/chromium/incrementalinstall/BootstrapInstrumentation.java

+// 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.
+
+package org.chromium.incrementalinstall;
+
+import android.app.Instrumentation;
+import android.os.Bundle;
+
+/**
+ * Notifies BootstrapApplication of the call to Instrumentation.onCreate().
+ */
+public final class BootstrapInstrumentation extends Instrumentation {
+    private final BootstrapApplication mApp;
+
+    BootstrapInstrumentation(BootstrapApplication app) {
+        mApp = app;
+    }
+
+    @Override
+    public void onCreate(Bundle arguments) {
+        super.onCreate(arguments);
+        mApp.onInstrumentationCreate(arguments);
+    }
+}