Add operator* and operator safe-bool to sk_sp.

tests/RefCntTest.cpp

Index: tests/RefCntTest.cpp
diff --git a/tests/RefCntTest.cpp b/tests/RefCntTest.cpp
index bda45317bcc76abf6915b5a1f7d082ce24f4b5be..60a34ecf886826ecaa972ac612c18ee1d1d8a702 100644
--- a/tests/RefCntTest.cpp
+++ b/tests/RefCntTest.cpp
@@ -164,9 +164,31 @@ DEF_TEST(sk_sp, reporter) {
     check(reporter, 0, 0, 1, 0);
     REPORTER_ASSERT(reporter, paint.fEffect.get()->fRefCnt == 1);
 
+    if (paint.get()) {
+        REPORTER_ASSERT(reporter, true);
+    } else {
+        REPORTER_ASSERT(reporter, false);
+    }
+    if (!paint.get()) {
+        REPORTER_ASSERT(reporter, false);
+    } else {
+        REPORTER_ASSERT(reporter, true);
+    }
+
     paint.set(nullptr);
     check(reporter, 0, 1, 1, 1);
 
+    if (paint.get()) {
+        REPORTER_ASSERT(reporter, false);
+    } else {
+        REPORTER_ASSERT(reporter, true);
+    }
+    if (!paint.get()) {
+        REPORTER_ASSERT(reporter, true);
+    } else {
+        REPORTER_ASSERT(reporter, false);
+    }
+
     auto e = Create();
     REPORTER_ASSERT(reporter, sizeof(e) == sizeof(void*));
 
@@ -180,9 +202,14 @@ DEF_TEST(sk_sp, reporter) {
     check(reporter, 2, 1, 2, 1);
     REPORTER_ASSERT(reporter, paint.fEffect.get()->fRefCnt == 3);
 
+    // Test sk_sp::operator->
     delete paint.get()->method();
     check(reporter, 2, 1, 2, 1);
 
+    // Test sk_sp::operator*
+    delete (*paint.get()).method();
+    check(reporter, 2, 1, 2, 1);
+
     paint.set(nullptr);
     e = nullptr;
     paint2.set(nullptr);