Add Tracing.requestMemoryDump method stub to DevTools API

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 <set>
 #include <string>
 
@@ skipping 24 matching lines @@
 
   void OnTraceDataCollected(const std::string& trace_fragment);
   void OnTraceComplete();
 
   Response Start(DevToolsCommandId command_id,
                  const std::string* categories,
                  const std::string* options,
                  const double* buffer_usage_reporting_interval);
   Response End(DevToolsCommandId command_id);
   Response GetCategories(DevToolsCommandId command);
+  Response RequestMemoryDump(DevToolsCommandId command_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 SetupTimer(double usage_reporting_interval);
@@ skipping 10 matching lines @@
   base::WeakPtrFactory<TracingHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingHandler);
 };
 
 }  // namespace tracing
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TRACING_HANDLER_H_