Hooked the trace event argument whitelist up to the background_trace_manager

content/browser/tracing/background_tracing_manager_impl.h

 // Copyright 2015 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 CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_MANAGER_IMPL_H_
 
 #include "base/lazy_instance.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/tracing/tracing_controller_impl.h"
 #include "content/public/browser/background_tracing_config.h"
 #include "content/public/browser/background_tracing_manager.h"
 
 namespace content {
 
 class BackgroundTracingManagerImpl : public content::BackgroundTracingManager {
  public:
   static BackgroundTracingManagerImpl* GetInstance();
 
   bool SetActiveScenario(scoped_ptr<BackgroundTracingConfig>,
                          const ReceiveCallback&,
+                         const base::Closure& enabled_callback,

[shatch, 2015/05/22 22:21:37]

Is this needed? Just for testing?

                          bool) override;
   void WhenIdle(IdleCallback idle_callback) override;
 
   void TriggerNamedEvent(TriggerHandle, StartedFinalizingCallback) override;
   TriggerHandle RegisterTriggerType(const char* trigger_name) override;
   void GetTriggerNameList(std::vector<std::string>* trigger_names) override;
 
   void InvalidateTriggerHandlesForTesting() override;
 
  private:
   BackgroundTracingManagerImpl();
   ~BackgroundTracingManagerImpl() override;
 
-  void EnableRecording(base::trace_event::CategoryFilter);
-  void EnableRecordingIfConfigNeedsIt();
+  void EnableRecording(base::trace_event::CategoryFilter,
+                       const base::Closure& enabled_callback);
+  void EnableRecordingIfConfigNeedsIt(const base::Closure& enabled_callback);
   void OnFinalizeStarted(scoped_refptr<base::RefCountedString>);
   void OnFinalizeComplete();
   void BeginFinalizing(StartedFinalizingCallback);
 
   std::string GetTriggerNameFromHandle(TriggerHandle handle) const;
   bool IsTriggerHandleValid(TriggerHandle handle) const;
 
   bool IsAbleToTriggerTracing(TriggerHandle handle) const;
   bool IsSupportedConfig(BackgroundTracingConfig* config);
 
@@ skipping 27 matching lines @@
   IdleCallback idle_callback_;
 
   friend struct base::DefaultLazyInstanceTraits<BackgroundTracingManagerImpl>;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundTracingManagerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_MANAGER_IMPL_H_