Allow VRDisplay to specify which frame the layer bounds should be updated at.

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 ee4aa9843e6188d468b450677340af9e5b586d8b..ccf091dd2b86a97e445187f7159e2167a1d3caa8 100644
--- a/chrome/browser/android/vr_shell/vr_shell.cc
+++ b/chrome/browser/android/vr_shell/vr_shell.cc
@@ -294,12 +294,13 @@ void VrShell::SetWebVRSecureOrigin(bool secure_origin) {
 
 void VrShell::SubmitWebVRFrame() {}
 
-void VrShell::UpdateWebVRTextureBounds(const gvr::Rectf& left_bounds,
+void VrShell::UpdateWebVRTextureBounds(uint32_t frame_index,
+                                       const gvr::Rectf& left_bounds,
                                        const gvr::Rectf& right_bounds) {
   GLThread* thread = static_cast<GLThread*>(gl_thread_.get());
   PostToGlThreadWhenReady(base::Bind(&VrShellGl::UpdateWebVRTextureBounds,
-                                     thread->GetVrShellGl(), left_bounds,
-                                     right_bounds));
+                                     thread->GetVrShellGl(), frame_index,
+                                     left_bounds, right_bounds));
 }
 
 // TODO(mthiesse): Do not expose GVR API outside of GL thread.