Add more WebVR layout tests, adjust test format

third_party/WebKit/LayoutTests/vr/getVRDisplays_one_display.html

Index: third_party/WebKit/LayoutTests/vr/getVRDisplays_one_display.html
diff --git a/third_party/WebKit/LayoutTests/vr/getVRDisplays_one_display.html b/third_party/WebKit/LayoutTests/vr/getVRDisplays_one_display.html
index e2e5d3d49174b5e1b88f20c3b3a6f12095ab44ee..5379278dd31f7923d2ec88a66da4f5095e5b0be9 100644
--- a/third_party/WebKit/LayoutTests/vr/getVRDisplays_one_display.html
+++ b/third_party/WebKit/LayoutTests/vr/getVRDisplays_one_display.html
@@ -7,14 +7,25 @@
 <script>
 let fakeDisplays = fakeVRDisplays();
 
-vr_test((service) => {
-  return navigator.getVRDisplays().then(devices => {
-      assert_true(devices != null);
-      assert_equals(1, devices.length);
-      assert_equals(devices[0].displayName, 'Google, Inc. Daydream View');
-      assert_true(devices[0].capabilities.hasOrientation);
-      assert_true(devices != null);
+vr_test( (t) => {
+  return navigator.getVRDisplays().then( (displays) => {
+    t.step( () => {
+      assert_true(displays != null);
+      assert_equals(1, displays.length);
+      let display = displays[0];
+      assert_equals(display.displayName, 'Google, Inc. Daydream View');
+      assert_true(display.capabilities.hasOrientation);
+      assert_equals(display.depthNear, 0.01);

[bajones, 2017/01/06 20:20:25]

Again, let's try to consistently use approx_equals for floats.

[bsheedy, 2017/01/06 22:14:19]

Done.

+      assert_equals(display.depthFar, 10000.0);
+    }, "getVRDisplays returned correct results");
+  }, (err) => {
+    t.step( () => {
+      assert_unreached("getVRDisplays rejected");
     });
-}, [fakeDisplays['Pixel']], 'test 1 VRDisplay');
+  }).then( () => {
+    t.done();
+  });
+}, [fakeDisplays["Pixel"]],
+"WebVR properly returns a single display");
 
 </script>