[Tracing] Support multi-categories group list.

test/cctest/libplatform/test-tracing.cc

Index: test/cctest/libplatform/test-tracing.cc
diff --git a/test/cctest/libplatform/test-tracing.cc b/test/cctest/libplatform/test-tracing.cc
index 6189ed2dfc6df375f056ba1da3879e9af3bd2d18..5dc6b965f16c48af1fc47ea64557d07c4c1452ad 100644
--- a/test/cctest/libplatform/test-tracing.cc
+++ b/test/cctest/libplatform/test-tracing.cc
@@ -25,6 +25,14 @@ TEST(TestTraceConfig) {
   CHECK_EQ(trace_config->IsCategoryGroupEnabled(
                TRACE_DISABLED_BY_DEFAULT("v8.runtime")),
            true);
+  CHECK_EQ(trace_config->IsCategoryGroupEnabled("v8,v8.cpu_profile"), true);
+  CHECK_EQ(
+      trace_config->IsCategoryGroupEnabled("v8,disabled-by-default-v8.runtime"),
+      true);
+  CHECK_EQ(trace_config->IsCategoryGroupEnabled(
+               "v8_cpu_profile,v8.cpu_profile.hires"),
+           false);
+
   delete trace_config;
 }