Use variable length key (rather than accumulated matrix) as save layer hoisting key

tests/RecordReplaceDrawTest.cpp

Index: tests/RecordReplaceDrawTest.cpp
diff --git a/tests/RecordReplaceDrawTest.cpp b/tests/RecordReplaceDrawTest.cpp
index 5d407387da18c56fb78e62600aba4d53bd6173fa..57ae4dcbe68a84f34936e5f23eaef1ee55a76e58 100644
--- a/tests/RecordReplaceDrawTest.cpp
+++ b/tests/RecordReplaceDrawTest.cpp
@@ -115,9 +115,10 @@ void test_replacements(skiatest::Reporter* r, bool useBBH) {
         pic.reset(recorder.endRecording());
     }
 
+    int key[2] = { 1, 1 };
+
     GrReplacements replacements;
-    GrReplacements::ReplacementInfo* ri = replacements.newReplacement(pic->uniqueID(),
-                                                                      0, SkMatrix::I());
+    GrReplacements::ReplacementInfo* ri = replacements.newReplacement(pic->uniqueID(), 0, key, 2);
     ri->fStop = 2;
     ri->fPos.set(0, 0);
     ri->fImage = make_image(SK_ColorRED);