Adds end-to-end tests for VrShell navigation transitions.

chrome/browser/android/vr_shell/vr_shell.cc

Index: chrome/browser/android/vr_shell/vr_shell.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell.cc b/chrome/browser/android/vr_shell/vr_shell.cc
index 1917ddbef19bccb8195c63e9dc0a1d1bd400e840..48486a7ec0126eab09363e8af13ba6f5cdf78335 100644
--- a/chrome/browser/android/vr_shell/vr_shell.cc
+++ b/chrome/browser/android/vr_shell/vr_shell.cc
@@ -276,6 +276,11 @@ void VrShell::SetWebVrMode(JNIEnv* env,
                                      gl_thread_->GetSceneManager(), enabled));
 }
 
+bool VrShell::GetWebVrMode(JNIEnv* env,
+                           const base::android::JavaParamRef<jobject>& obj) {
+  return webvr_mode_;
+}
+
 void VrShell::OnLoadProgressChanged(JNIEnv* env,
                                     const JavaParamRef<jobject>& obj,
                                     double progress) {