Added 8 new vr layout tests for various requestPresent conditions

third_party/WebKit/LayoutTests/vr/resources/presentation-setup.js

Index: third_party/WebKit/LayoutTests/vr/resources/presentation-setup.js
diff --git a/third_party/WebKit/LayoutTests/vr/resources/presentation-setup.js b/third_party/WebKit/LayoutTests/vr/resources/presentation-setup.js
index 33c8269e56f08f2a0020cd21f8566ffec13777aa..b024216b6ecee14596be28fef2d2c04ab3fb1a3d 100644
--- a/third_party/WebKit/LayoutTests/vr/resources/presentation-setup.js
+++ b/third_party/WebKit/LayoutTests/vr/resources/presentation-setup.js
@@ -1,9 +1,14 @@
+var webgl2 = false;
 var webglCanvas = document.getElementById("webgl-canvas");
+if (!webglCanvas) {
+  webglCanvas = document.getElementById("webgl2-canvas");
+  webgl2 = true;
+}
 var glAttributes = {
   alpha : false,
   antialias : false,
 };
-var gl = webglCanvas.getContext("webgl", glAttributes);
+var gl = webglCanvas.getContext(webgl2 ? "webgl2" : "webgl", glAttributes);
 
 function runWithUserGesture(fn) {
   function thunk() {