VR: Fail presentation without layers

Without any layers or a valid client target there is nothing to present.

Bug: None
Test: Compiled
Change-Id: Ib8b4b7ced628a38c69be726bf1c04dde2882c614
(cherry picked from commit 12da96889be17f1964681210d0f780fd70fefc33)

parent 39fe1d87

services/vr/vr_window_manager/composer/impl/vr_hwc.cpp

+5 −0

Original line number	Diff line number	Diff line
		@@ -178,6 +178,11 @@ Error HwcDisplay::GetFrame(
		}
		}

		if (frame.empty()) {
		ALOGE("Requested frame with no layers");
		return Error::BAD_LAYER;
		}

		// Increment the time the fence is signalled every time we get the
		// presentation frame. This ensures that calling ReleaseFrame() only affects
		// the current frame.