[Tracing] Add metadata filter

content/public/browser/tracing_controller.h

 // Copyright 2013 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_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
 
 #include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/tracing_delegate.h"
 
 namespace content {
 
 class TracingController;
 
 // TracingController is used on the browser processes to enable/disable
 // tracing status and collect trace data. Only the browser UI thread is allowed
 // to interact with the TracingController object. All callbacks are called on
 // the UI thread.
 class TracingController {
  public:
 
   CONTENT_EXPORT static TracingController* GetInstance();
 
   // An interface for trace data consumer. An implemnentation of this interface
   // is passed to either DisableTracing() or CaptureMonitoringSnapshot() and
   // receives the trace data followed by a notification that all child processes
   // have completed tracing and the data collection is over.
   // All methods are called on the UI thread.
   // Close method will be called exactly once and no methods will be
   // called after that.
   class CONTENT_EXPORT TraceDataSink
       : public base::RefCountedThreadSafe<TraceDataSink> {
    public:
+    TraceDataSink();
+
     virtual void AddTraceChunk(const std::string& chunk) {}
     virtual void SetSystemTrace(const std::string& data) {}
 
     // Notice that TracingController adds some default metadata when
-    // DisableRecording is called, which may override metadata that you would
+    // StopTracing is called, which may override metadata that you would
     // set beforehand in case of key collision.
     virtual void AddMetadata(const base::DictionaryValue& data);
-    virtual const base::DictionaryValue& GetMetadata() const;
+    virtual scoped_ptr<const base::DictionaryValue> GetMetadataCopy() const;
+    virtual void SetMetadataFilterPredicate(
+        const MetadataFilterPredicate& metadata_filter_predicate);
     // TODO(prabhur) Replace all the Set* functions with a generic function:
     // TraceDataSink::AppendAdditionalData(const std::string& name,
     // const std::string& trace_data)
     virtual void SetPowerTrace(const std::string& data) {}
     virtual void Close() {}
 
    protected:
     friend class base::RefCountedThreadSafe<TraceDataSink>;
-    virtual ~TraceDataSink() {}
+    virtual ~TraceDataSink();
 
    private:
+    MetadataFilterPredicate metadata_filter_predicate_;
     base::DictionaryValue metadata_;
   };
 
   // An implementation of this interface is passed when constructing a
   // TraceDataSink, and receives chunks of the final trace data as it's being
   // constructed.
   // Methods may be called from any thread.
   class CONTENT_EXPORT TraceDataEndpoint
       : public base::RefCountedThreadSafe<TraceDataEndpoint> {
    public:
@@ skipping 156 matching lines @@
   // Check if the tracing system is tracing
   virtual bool IsTracing() const = 0;
 
  protected:
   virtual ~TracingController() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_