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

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
index d5ba53c31bb0f652f54049ffbd53fe1d3d23bd2d..bed41007d1e0dd50c8b25d7dc39c7591f684b84b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
@@ -467,6 +467,11 @@ public class VrShellImpl
     }
 
     @Override
+    public boolean getWebVrModeEnabled() {
+        return nativeGetWebVrMode(mNativeVrShell);
+    }
+
+    @Override
     public FrameLayout getContainer() {
         return this;
     }
@@ -599,6 +604,7 @@ public class VrShellImpl
     private native void nativeContentPhysicalBoundsChanged(long nativeVrShell, int width,
             int height, float dpr);
     private native void nativeSetWebVrMode(long nativeVrShell, boolean enabled);
+    private native boolean nativeGetWebVrMode(long nativeVrShell);
     private native void nativeOnTabListCreated(long nativeVrShell, Tab[] mainTabs,
             Tab[] incognitoTabs);
     private native void nativeOnTabUpdated(long nativeVrShell, boolean incognito, int id,