CompressedStringDataSink for trace_controller.

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>
 
@@ skipping 27 matching lines @@
    public:
     virtual void AddTraceChunk(const std::string& chunk) {}
     virtual void SetSystemTrace(const std::string& data) {}
     virtual void Close() {}
 
    protected:
     friend class base::RefCountedThreadSafe<TraceDataSink>;
     virtual ~TraceDataSink() {}
   };
 
+  // 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:
+    virtual void ReceiveTraceChunk(const std::string& chunk) {}
+    virtual void ReceiveTraceFinalContents(const std::string& contents) {}
+
+   protected:
+    friend class base::RefCountedThreadSafe<TraceDataEndpoint>;
+    virtual ~TraceDataEndpoint() {}
+  };
+
   // Create a trace sink that may be supplied to DisableRecording or
   // CaptureMonitoringSnapshot to capture the trace data as a string.
   CONTENT_EXPORT static scoped_refptr<TraceDataSink> CreateStringSink(
       const base::Callback<void(base::RefCountedString*)>& callback);
 
+  CONTENT_EXPORT static scoped_refptr<TraceDataSink> CreateCompressedStringSink(
+      scoped_refptr<TraceDataEndpoint> endpoint);
+
   // Create a trace sink that may be supplied to DisableRecording or
   // CaptureMonitoringSnapshot to dump the trace data to a file.
   CONTENT_EXPORT static scoped_refptr<TraceDataSink> CreateFileSink(
       const base::FilePath& file_path,
       const base::Closure& callback);
 
   // Get a set of category groups. The category groups can change as
   // new code paths are reached.
   //
   // Once all child processes have acked to the GetCategories request,
@@ skipping 115 matching lines @@
   // watch event callback.
   virtual bool CancelWatchEvent() = 0;
 
  protected:
   virtual ~TracingController() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_