Update mojo sdk to rev cc531b32182099a5a034a99daff35ed5d38a61c8

mojo/public/c/test_support/test_support.h

Index: mojo/public/c/test_support/test_support.h
diff --git a/mojo/public/c/test_support/test_support.h b/mojo/public/c/test_support/test_support.h
index 2b686b272eb5eb9933ca182b6133a6389faf68c6..73a2eefac2e219f0fa4d5ae01f3991b721e1624c 100644
--- a/mojo/public/c/test_support/test_support.h
+++ b/mojo/public/c/test_support/test_support.h
@@ -15,8 +15,15 @@
 extern "C" {
 #endif
 
+// |sub_test_name| is optional. If not null, it usually describes one particular
+// configuration of the test. For example, if |test_name| is "TestPacketRate",
+// |sub_test_name| could be "100BytesPerPacket".
+// When the perf data is visualized by the performance dashboard, data with
+// different |sub_test_name|s (but the same |test_name|) are depicted as
+// different traces on the same chart.
 MOJO_TEST_SUPPORT_EXPORT void MojoTestSupportLogPerfResult(
     const char* test_name,
+    const char* sub_test_name,
     double value,
     const char* units);