[tracing] Introduce "allowed_dump_modes" for memory dump config

base/trace_event/trace_config.h

Index: base/trace_event/trace_config.h
diff --git a/base/trace_event/trace_config.h b/base/trace_event/trace_config.h
index 001cecd7a897bc4dae7537bbae6a7c7cf8c089d7..9d10e322fee805fcd146a7cfc20d38563dd211c0 100644
--- a/base/trace_event/trace_config.h
+++ b/base/trace_event/trace_config.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 
+#include <set>
 #include <string>
 #include <vector>
 
@@ -69,6 +70,11 @@ class BASE_EXPORT TraceConfig {
     // Reset the values in the config.
     void Clear();
 
+    // Set of memory dump modes allowed for the tracing session. The explicitly
+    // triggered dumps will be successful only if the dump mode is allowed in
+    // the config.
+    std::set<MemoryDumpLevelOfDetail> allowed_dump_modes;
+
     std::vector<Trigger> triggers;
     HeapProfiler heap_profiler_options;
   };