Add feature tag for high-performance VR devices.

Bug: 26667978
Change-Id: I299446555268b78f38177d89c71ff5340fdb0b8f
diff --git a/data/etc/handheld_core_hardware.xml b/data/etc/handheld_core_hardware.xml
index 5edf0e8..9cb4d6d 100644
--- a/data/etc/handheld_core_hardware.xml
+++ b/data/etc/handheld_core_hardware.xml
@@ -52,6 +52,9 @@
 
     <!-- Feature to specify if the device supports a VR mode. -->
     <feature name="android.software.vr.mode" />
+    <!-- Devices with all optimizations required to be a "VR Ready" device that
+         pass all CTS tests for this feature must include feature
+         android.hardware.vr.high_performance -->
 
     <!-- devices with GPS must include android.hardware.location.gps.xml -->
     <!-- devices with an autofocus camera and/or flash must include either