adjust waiting to work around Oculus Rift black screenshot issue

GraphicsTests/LegacyRenderer/Assets/Tests/GraphicsTests.cs

@@ -9,6 +9,8 @@ using UnityEngine.XR;
 
 public class GraphicsTests
 {
+    bool check = true;
+
     private string imageResultsPath;
 
     [OneTimeSetUp()]
@@ -28,9 +30,15 @@ public class GraphicsTests
     [UseGraphicsTestCases]
     public IEnumerator Test1(GraphicsTestCase testCase)
     {
-        SceneManager.LoadScene(testCase.ScenePath);
+        var asyncLoad = SceneManager.LoadSceneAsync(testCase.ScenePath);
 
-        yield return null;
+        yield return new WaitUntil(() => asyncLoad.isDone);
+
+        if(check)
+        {
+            yield return new WaitForSeconds(1);
+            check = false;
+        }
         
         XRDevice.DisableAutoXRCameraTracking(Camera.main, true);
 
@@ -39,8 +47,7 @@ public class GraphicsTests
         Assert.IsNotNull(testSettings, "No test settings script found, not a valid test");
 
         Screen.SetResolution(testSettings.ImageComparisonSettings.TargetWidth, testSettings.ImageComparisonSettings.TargetHeight, false);
-
-        yield return SkipFrame(30);
+        
         yield return new WaitForEndOfFrame();
 
         var screenShot = new Texture2D(0, 0, TextureFormat.RGBA32, false);
@@ -52,7 +59,7 @@ public class GraphicsTests
 
     protected IEnumerator SkipFrame(int frames)
     {
-        Debug.Log(("Skipping {0} frames.", frames));
+        Debug.Log(string.Format("Skipping {0} frames.", frames));
 
         for (int f = 0; f < frames; f++)
         {