SurfaceFlinger: fix color transfer test

Add support for color management in
LayerTransactionTest.SetColorTransformBasic.

If color management is enabled, some considerations are needed
for the expected color output.

Test: adb shell /data/nativetest64/SurfaceFlinger_test/SurfaceFlinger_test
Change-Id: I7be7d561e7683fd57db0519932c4c308a6350c0d
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 500df05..25f762b 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -633,6 +633,8 @@
         return NO_ERROR;
     }
 
+    virtual bool isColorManagementUsed() const { return false; }
+
 protected:
     IBinder* onAsBinder() override { return nullptr; }