Update mojo sdk to rev cc531b32182099a5a034a99daff35ed5d38a61c8

mojo/public/c/test_support/test_support.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_C_TEST_SUPPORT_TEST_SUPPORT_H_
 #define MOJO_PUBLIC_C_TEST_SUPPORT_TEST_SUPPORT_H_
 
 // Note: This header should be compilable as C.
 
 #include <stdio.h>
 
 #include "mojo/public/c/test_support/test_support_export.h"
 
 #ifdef __cplusplus
 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);
 
 // Opens a "/"-delimited file path relative to the source root.
 MOJO_TEST_SUPPORT_EXPORT FILE* MojoTestSupportOpenSourceRootRelativeFile(
     const char* source_root_relative_path);
 
 // Enumerates a "/"-delimited directory path relative to the source root.
 // Returns only regular files. The return value is a heap-allocated array of
 // heap-allocated strings. Each must be free'd separately.
 //
 // The return value is built like so:
 //
 //   char** rv = (char**) calloc(N + 1, sizeof(char*));
 //   rv[0] = strdup("a");
 //   rv[1] = strdup("b");
 //   rv[2] = strdup("c");
 //   ...
 //   rv[N] = NULL;
 //
 MOJO_TEST_SUPPORT_EXPORT
 char** MojoTestSupportEnumerateSourceRootRelativeDirectory(
     const char* source_root_relative_path);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // MOJO_PUBLIC_C_TEST_SUPPORT_TEST_SUPPORT_H_