Use forceHwcCopyForVirtualDisplay in configStore

Test: Manual
Change-Id: Ie6f816cf8f48b1cca41d51f40e9f0ae49aef2908
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 0b4be4a..e6ccc41 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -136,6 +136,12 @@
     // signaling time.
     static int64_t dispSyncPresentTimeOffset;
 
+    // Some hardware can do RGB->YUV conversion more efficiently in hardware
+    // controlled by HWC than in hardware controlled by the video encoder.
+    // This instruct VirtualDisplaySurface to use HWC for such conversion on
+    // GL composition.
+    static bool useHwcForRgbToYuv;
+
     static char const* getServiceName() ANDROID_API {
         return "SurfaceFlinger";
     }