[tracing] Introduce "allowed_dump_modes" for memory dump config

base/trace_event/memory_dump_manager.h

Index: base/trace_event/memory_dump_manager.h
diff --git a/base/trace_event/memory_dump_manager.h b/base/trace_event/memory_dump_manager.h
index fd2226ae6c7e7b69db119b56cce22f52512f5807..b5c3a157a82d8504abd24fdfa350708da619b07b 100644
--- a/base/trace_event/memory_dump_manager.h
+++ b/base/trace_event/memory_dump_manager.h
@@ -115,6 +115,9 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
   void OnTraceLogEnabled() override;
   void OnTraceLogDisabled() override;
 
+  // Returns true if the dump mode is allowed for current tracing session.
+  bool IsDumpModeAllowed(MemoryDumpLevelOfDetail dump_mode) const;
+
   // Returns the MemoryDumpSessionState object, which is shared by all the
   // ProcessMemoryDump and MemoryAllocatorDump instances through all the tracing
   // session lifetime.
@@ -272,7 +275,7 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
   // the dump triggers from trace config.
   class BASE_EXPORT PeriodicGlobalDumpTimer {
    public:
-    PeriodicGlobalDumpTimer();
+    explicit PeriodicGlobalDumpTimer(MemoryDumpManager* mdm);
     ~PeriodicGlobalDumpTimer();
 
     void Start(const std::vector<TraceConfig::MemoryDumpConfig::Trigger>&
@@ -285,6 +288,8 @@ class BASE_EXPORT MemoryDumpManager : public TraceLog::EnabledStateObserver {
     // Periodically called by the timer.
     void RequestPeriodicGlobalDump();
 
+    MemoryDumpManager* mdm_;
+
     RepeatingTimer timer_;
     uint32_t periodic_dumps_count_;
     uint32_t light_dump_rate_;