Do not use overlays when VR shell is enabled.

ui/android/display_android_manager.h

 // 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.
 
 #ifndef UI_ANDROID_DISPLAY_ANDROID_MANAGER_H_
 #define UI_ANDROID_DISPLAY_ANDROID_MANAGER_H_
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
@@ skipping 19 matching lines @@
   void UpdateDisplay(JNIEnv* env,
                      const base::android::JavaParamRef<jobject>& jobject,
                      jint sdkDisplayId,
                      jint physicalWidth,
                      jint physicalHeight,
                      jint width,
                      jint height,
                      jfloat dipScale,
                      jint rotationDegrees,
                      jint bitsPerPixel,
-                     jint bitsPerComponent);
+                     jint bitsPerComponent,
+                     jboolean isVirtual);
   void RemoveDisplay(JNIEnv* env,
                      const base::android::JavaParamRef<jobject>& jobject,
                      jint sdkDisplayId);
   void SetPrimaryDisplayId(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& jobject,
                            jint sdkDisplayId);
 
  private:
   friend void SetScreenAndroid();
   DisplayAndroidManager();
 
   int primary_display_id_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayAndroidManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_ANDROID_DISPLAY_ANDROID_MANAGER_H_