Introduce ChromeVR to Chrome on Android (behind a build flag)

chrome/browser/BUILD.gn

 # Copyright 2014 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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 745 matching lines @@
       "//components/data_usage/android",
       "//components/precache/content",
       "//components/precache/core",
       "//components/resources:components_resources",
       "//components/toolbar",
       "//components/web_contents_delegate_android",
       "//third_party/smhasher:murmurhash2",
     ]
   }
 
+  if (enable_vr_shell && android_java_ui) {
+    defines += [ "ENABLE_VR_SHELL" ]
+    deps += [ "android/vr_shell:vr_shell" ]
+    configs += [ "//third_party/gvr-android-sdk:libgvr_config" ]
+  }
+
   if (is_android) {
     deps += [
       "//components/cdm/browser",
       "//components/resources:components_resources",
       "//third_party/android_opengl/etc1",
       "//third_party/android_tools:cpu_features",
       "//third_party/libaddressinput:util",
     ]
 
     deps -= [
@@ skipping 588 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }