Add support for camera preview to be in overlay surfaces.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
diff --git a/camera/libcameraservice/CameraService.h b/camera/libcameraservice/CameraService.h
index cd8c1e9..e5a5d51 100644
--- a/camera/libcameraservice/CameraService.h
+++ b/camera/libcameraservice/CameraService.h
@@ -159,6 +159,7 @@
                     sp<ICameraClient>           mCameraClient;
                     sp<CameraHardwareInterface> mHardware;
                     pid_t                       mClientPid;
+                    bool                        mUseOverlay;
     };
 
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