DM: this must have been missing from the previous CL

It'd be neat to have an Android trybot.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1678293002

Review URL: https://codereview.chromium.org/1678293002
diff --git a/dm/DMSrcSinkAndroid.h b/dm/DMSrcSinkAndroid.h
index 02eb1c9..2d7ad65 100644
--- a/dm/DMSrcSinkAndroid.h
+++ b/dm/DMSrcSinkAndroid.h
@@ -23,7 +23,7 @@
     HWUISink() { }
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
-    int enclave() const override { return kGPU_Enclave; }
+    bool serial() const override { return true; }
     const char* fileExtension() const override { return "png"; }
     SinkFlags flags() const override { return SinkFlags{ SinkFlags::kGPU, SinkFlags::kDirect }; }
 };
@@ -37,7 +37,7 @@
     explicit ViaAndroidSDK(Sink*);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
-    int enclave() const override { return fSink->enclave(); }
+    bool serial() const override { return fSink->serial(); }
     const char* fileExtension() const override { return fSink->fileExtension(); }
     SinkFlags flags() const override {
         SinkFlags flags = fSink->flags();