Enable WebVR presentation from Chrome Custom Tab

chrome/android/java_sources.gni

 # 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.
 
 chrome_java_sources = [
   "java/src/com/google/android/apps/chrome/appwidget/bookmarks/BookmarkThumbnailWidgetProvider.java",
   "java/src/org/chromium/chrome/browser/ActivityTabTaskDescriptionHelper.java",
   "java/src/org/chromium/chrome/browser/ActivityTaskDescriptionIconGenerator.java",
   "java/src/org/chromium/chrome/browser/AfterStartupTaskUtils.java",
   "java/src/org/chromium/chrome/browser/ApplicationInitialization.java",
@@ skipping 1208 matching lines @@
   "java/src/org/chromium/chrome/browser/widget/textbubble/ArrowBubbleDrawable.java",
   "java/src/org/chromium/chrome/browser/widget/textbubble/TextBubble.java",
   "java/src/org/chromium/chrome/browser/widget/textbubble/ViewAnchoredTextBubble.java",
 ]
 
 chrome_vr_java_sources = [
   "java/src/org/chromium/chrome/browser/vr_shell/NonPresentingGvrContextImpl.java",
   "java/src/org/chromium/chrome/browser/vr_shell/VrClassesWrapperImpl.java",
   "java/src/org/chromium/chrome/browser/vr_shell/VrCoreVersionCheckerImpl.java",
   "java/src/org/chromium/chrome/browser/vr_shell/VrDaydreamApiImpl.java",
+  "java/src/org/chromium/chrome/browser/vr_shell/VrProxyActivity.java",
   "java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java",
   "java/src/org/chromium/chrome/browser/vr_shell/VrWindowAndroid.java",
   "javatests/src/org/chromium/chrome/browser/vr_shell/OnDispatchTouchEventCallback.java",
 ]
 
 chrome_test_java_sources = [
   "javatests/src/org/chromium/chrome/browser/compositor/CompositorVisibilityTest.java",
   "javatests/src/org/chromium/base/test/util/parameter/ParameterizedTestAnnotationTest.java",
   "javatests/src/org/chromium/base/test/util/parameter/ParameterizedTestClassAnnotationInheritanceTest.java",
   "javatests/src/org/chromium/base/test/util/parameter/ParameterizedTestClassAnnotationParameterSetAndTest.java",
@@ skipping 443 matching lines @@
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/SyncTestBase.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/TypedUrlsTest.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/ui/PassphraseTypeDialogFragmentTest.java",
 ]
 
 # Only used for testing, should not be shipped to end users.
 if (!is_official_build) {
   chrome_java_sources += [ "java/src/org/chromium/chrome/browser/offlinepages/evaluation/OfflinePageEvaluationBridge.java" ]
   chrome_test_java_sources += [ "javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageSavePageLaterEvaluationTest.java" ]
 }