New SkRTConf macro SK_CONF_TRY_SET: no complaint on missing configuration

tests/RuntimeConfigTest.cpp

Index: tests/RuntimeConfigTest.cpp
diff --git a/tests/RuntimeConfigTest.cpp b/tests/RuntimeConfigTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b1a46951027e42b20a243ba4cb6cd1a708eb4975
--- /dev/null
+++ b/tests/RuntimeConfigTest.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkRTConf.h"
+#include "Test.h"
+#include "TestClassDef.h"
+
+SK_CONF_DECLARE(int, c_RTConfTestVariable,
+                "test.utils.rtconf.testVariable", 1,
+                "This is only a test. Do not be alarmed.");
+// TODO(skia-team): more comprehensive unit tests of the SkRTConf
+// system.
+DEF_TEST(RuntimeConfig, reporter) {
+    REPORTER_ASSERT(reporter, 1 == c_RTConfTestVariable);
+    SK_CONF_SET("test.utils.rtconf.testVariable", 2);
+    #ifdef SK_DEVELOPER

[caryclark, 2013/11/01 16:57:36]

I find this difficult to parse. Maybe outdent the #if lines?

[hal.canary, 2013/11/01 17:01:18]

Done.

+    REPORTER_ASSERT(reporter, 2 == c_RTConfTestVariable);
+    #else  // not SK_DEVELOPER
+    // Can not change RTConf variables in Release.
+    REPORTER_ASSERT(reporter, 1 == c_RTConfTestVariable);
+    #endif  // SK_DEVELOPER
+    // This should not give a warning.
+    SK_CONF_TRY_SET("test.utils.rtconf.nonexistentVariable", 7);
+}