Notify VRDeviceProviders when there are pages listening for vrdisplayactivate

chrome/browser/android/vr_shell/vr_shell_delegate.cc

Index: chrome/browser/android/vr_shell/vr_shell_delegate.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell_delegate.cc b/chrome/browser/android/vr_shell/vr_shell_delegate.cc
index 850f8311fe5d820326e8e7b940835e9730e7d714..1f98c8b817debc1718710abb49d8f62f43a91582 100644
--- a/chrome/browser/android/vr_shell/vr_shell_delegate.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_delegate.cc
@@ -120,6 +120,12 @@ void VrShellDelegate::DestroyNonPresentingDelegate() {
   }
 }
 
+void VrShellDelegate::SetListeningForActivate(bool listening) {
+  JNIEnv* env = AttachCurrentThread();
+  Java_VrShellDelegate_setListeningForWebVrActivate(
+      env, j_vr_shell_delegate_.obj(), listening);
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------