Make ViewRoot the top of the ViewAndroid tree

ui/android/BUILD.gn

 # 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.
 
 import("//build/config/android/rules.gni")
 import("//testing/test.gni")
 
 assert(is_android)
 
 component("android") {
@@ skipping 45 matching lines @@
 
   deps = [
     ":java_enums_srcjar",
     ":ui_android_jni_headers",
     "//base",
     "//cc",
     "//cc/surfaces",
     "//cc/surfaces:surface_id",
     "//skia",
     "//ui/display",
+    "//ui/events",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//url",
   ]
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "dummy_screen_android.cc",
@@ skipping 188 matching lines @@
     "//cc",
     "//cc:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx",
     "//ui/resources:ui_test_pak",
   ]
 }