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

third_party/WebKit/Source/modules/vr/VRDisplay.cpp

Index: third_party/WebKit/Source/modules/vr/VRDisplay.cpp
diff --git a/third_party/WebKit/Source/modules/vr/VRDisplay.cpp b/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
index c35e7f133671d7e0e39b8124b7fbd0ee82798014..74751db0be4eb1a03028a55f9e396542c505731b 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
@@ -573,7 +573,11 @@ void VRDisplay::updateLayerBounds() {
     rightBounds->height = 1.0f;
   }
 
-  m_display->UpdateLayerBounds(std::move(leftBounds), std::move(rightBounds));
+  // TODO(klausw): Tie updating layer bounds to when we render the correct
+  // frame.
+  // Specify a frame index of 0 for now, meaning to update immediately.
+  m_display->UpdateLayerBounds(0, std::move(leftBounds),
+                               std::move(rightBounds));
 }
 
 HeapVector<VRLayer> VRDisplay::getLayers() {