Add a test that uses C++11 features as a compiler canary.

tests/Cpp11Test.cpp

Index: tests/Cpp11Test.cpp
diff --git a/tests/TracingTest.cpp b/tests/Cpp11Test.cpp
similarity index 60%
copy from tests/TracingTest.cpp
copy to tests/Cpp11Test.cpp
index 730a46ce4d734a04ea18d68de6031b7e51d3d506..627c4d4f6927853626652c1c238e1398478f527a 100644
--- a/tests/TracingTest.cpp
+++ b/tests/Cpp11Test.cpp
@@ -5,9 +5,10 @@
  * found in the LICENSE file.
  */
 
-#include "SkTraceEvent.h"
 #include "Test.h"
 
-DEF_TEST(Tracing, reporter) {
-  TRACE_EVENT0("skia.testing", "just a test");
+DEF_TEST(Cpp11, r) {
+    auto square = [](int x){ return x*x; };
+
+    REPORTER_ASSERT(r, square(4) == 16);
 }