use SkTDynamicHash in picture recording

tests/FlatDataTest.cpp

Index: tests/FlatDataTest.cpp
diff --git a/tests/FlatDataTest.cpp b/tests/FlatDataTest.cpp
index be4e7cf8ad8693897bdb6114827be1976b2a1179..79f94b39edc2410f74c2e338c273bdc105216522 100644
--- a/tests/FlatDataTest.cpp
+++ b/tests/FlatDataTest.cpp
@@ -44,10 +44,8 @@ static void testCreate(skiatest::Reporter* reporter, const void* obj,
     // No need to delete data because that will be taken care of by the
     // controller.
     SkFlatData* data1 = SkFlatData::Create(&controller, obj, 0, flattenProc);
-    data1->setSentinelInCache();
     SkFlatData* data2 = SkFlatData::Create(&controller, obj, 1, flattenProc);
-    data2->setSentinelAsCandidate();
-    REPORTER_ASSERT(reporter, SkFlatData::Compare(*data1, *data2) == 0);
+    REPORTER_ASSERT(reporter, *data1 == *data2);
 }
 
 static void Tests(skiatest::Reporter* reporter) {