memory-infra: Move dump level check to observer and rename session state

base/trace_event/memory_tracing_observer.h

 // Copyright 2017 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 BASE_TRACE_EVENT_MEMORY_TRACING_OBSERVER_H_
 #define BASE_TRACE_EVENT_MEMORY_TRACING_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 15 matching lines @@
 
   // TraceLog::EnabledStateObserver implementation.
   void OnTraceLogEnabled() override;
   void OnTraceLogDisabled() override;
 
   bool AddDumpToTraceIfEnabled(const MemoryDumpRequestArgs*,
                                const ProcessId,
                                const ProcessMemoryDump*);
 
  private:
+  // Returns true if the dump mode is allowed for current tracing session.
+  bool IsDumpModeAllowed(MemoryDumpLevelOfDetail) const;
+
   MemoryDumpManager* const memory_dump_manager_;
   TraceLog* const trace_log_;
+  std::unique_ptr<TraceConfig::MemoryDumpConfig> memory_dump_config_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryTracingObserver);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MEMORY_TRACING_OBSERVER_H_