Bump gradle version to appease Android Studio.

build/android/gradle/build.gradle.jinja

 {# 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. #}
 // Generated by //build/android/generate_gradle.py
 {% if template_type == 'root' %}
 
 buildscript {
     repositories {
         jcenter()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:2.2.0"
+        classpath "com.android.tools.build:gradle:2.2.1"
     }
 }
 
 {% elif template_type in ('java_library', 'java_binary') %}
 
 apply plugin: "java"
 {% if template_type == 'java_binary' %}
 apply plugin: "application"
 {% endif %}
 
@@ skipping 101 matching lines @@
                 || it.name.endsWith('Renderscript')
                 || it.name.endsWith('Shaders'))
     }
     tasksToDisable.each { Task task ->
       task.enabled = false
     }
 }
 
 {% endif %}
 {% endif %}