Update DevTools Tracing.Start to accept trace config as a parameter

content/browser/devtools/protocol/tracing_handler.h

 // Copyright 2014 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_DEVTOOLS_PROTOCOL_TRACING_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TRACING_HANDLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
 #include <string>
 
+#include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/trace_event/trace_event.h"
 #include "content/browser/devtools/protocol/devtools_protocol_dispatcher.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/tracing_controller.h"
 
 namespace base {
 class RefCountedString;
 class Timer;
 }
 
 namespace content {
 namespace devtools {
 
@@ skipping 16 matching lines @@
 
   void OnTraceDataCollected(const std::string& trace_fragment);
   void OnTraceComplete();
   void OnTraceToStreamComplete(const std::string& stream_handle);
 
   // Protocol methods.
   Response Start(DevToolsCommandId command_id,
                  const std::string* categories,
                  const std::string* options,
                  const double* buffer_usage_reporting_interval,
-                 const std::string* transfer_mode);
+                 const std::string* transfer_mode,
+                 const scoped_ptr<base::DictionaryValue>& config);
   Response End(DevToolsCommandId command_id);
   Response GetCategories(DevToolsCommandId command);
   Response RequestMemoryDump(DevToolsCommandId command_id);
   Response RecordClockSyncMarker(const std::string& sync_id);
 
   bool did_initiate_recording() { return did_initiate_recording_; }
 
  private:
   void OnRecordingEnabled(DevToolsCommandId command_id);
   void OnBufferUsage(float percent_full, size_t approximate_event_count);
   void OnCategoriesReceived(DevToolsCommandId command_id,
                             const std::set<std::string>& category_set);
   void OnMemoryDumpFinished(DevToolsCommandId command_id,
                             uint64_t dump_guid,
                             bool success);
 
   void SetupTimer(double usage_reporting_interval);
   void StopTracing(
       const scoped_refptr<TracingController::TraceDataSink>& trace_data_sink);
   bool IsTracing() const;
   static bool IsStartupTracingActive();
+  CONTENT_EXPORT static base::trace_event::TraceConfig
+      GetTraceConfigFromDevtoolsConfig(
+          const base::DictionaryValue& devtools_config);
 
   scoped_ptr<base::Timer> buffer_usage_poll_timer_;
   Target target_;
 
   scoped_ptr<Client> client_;
   DevToolsIOContext* io_context_;
   int frame_tree_node_id_;
   bool did_initiate_recording_;
   bool return_as_stream_;
   base::WeakPtrFactory<TracingHandler> weak_factory_;
 
+  FRIEND_TEST_ALL_PREFIXES(TracingHandlerTest,
+                           GetTraceConfigFromDevtoolsConfig);
   DISALLOW_COPY_AND_ASSIGN(TracingHandler);
 };
 
 }  // namespace tracing
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TRACING_HANDLER_H_