VrShell: Add test for fullscreen transitions.

chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h

Index: chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h
diff --git a/chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h b/chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h
index 509087dbedd07b6e9db581249d673720885250de..282547ba976305504fd7e4d14fa0ef526c635e39 100644
--- a/chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h
+++ b/chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h
@@ -13,6 +13,14 @@ enum UiElementDebugId {
   kNone = 0,
   kWebVrPermanentHttpSecurityWarning,
   kWebVrTransientHttpSecurityWarning,
+  kContentQuad,
+  kCeiling,
+  kFloor,
+  kGrid,

[cjgrant, 2017/05/23 18:58:11]

Maybe kFloorGrid just to be clear?

[amp, 2017/05/23 20:56:02]

Done.  I think I actually refered to it as FloorGrid somewhere else too.

+  kBrowserBar,

[cjgrant, 2017/05/23 18:58:11]

This is called the URL bar everywhere else. kUrlBar?

[amp, 2017/05/23 20:56:02]

Done.

+  kLoadingIndicator,
+  kAudioCaptureIndicator,
+  kVideoCaptureIndicator,
   kCloseButton,
 };