[ComposerService] Add API to query protected content support.

Add API to query protected content support for upper stack usage.

BUG: 117436546
Test: Build, flash and boot. Check returned value.
Change-Id: I1bc7320a2ce5a99889c979f6d6fd159369668871
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 60173dc..2d773f2 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -655,7 +655,8 @@
         return NO_ERROR;
     }
 
-    virtual status_t getColorManagement(bool* /*outGetColorManagement*/) const { return NO_ERROR; }
+    status_t getColorManagement(bool* /*outGetColorManagement*/) const override { return NO_ERROR; }
+    status_t getProtectedContentSupport(bool* /*outSupported*/) const override { return NO_ERROR; }
 
 protected:
     IBinder* onAsBinder() override { return nullptr; }