Add DevToolsAgent::{enable,disable}Tracing

content/renderer/devtools/devtools_agent.h

 // Copyright (c) 2012 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_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_H_
 #define CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 48 matching lines @@
   virtual void visitAllocatedObjects(AllocatedObjectVisitor* visitor);
 
   typedef void (*TraceEventCallback)(
       char phase, const unsigned char*, const char* name, unsigned long long id,
       int numArgs, const char* const* argNames, const unsigned char* argTypes,
       const unsigned long long* argValues,
       unsigned char flags, double timestamp);
   virtual void resetTraceEventCallback() OVERRIDE;
   virtual void setTraceEventCallback(const blink::WebString& category_filter,
                                      TraceEventCallback cb) OVERRIDE;
+  virtual void enableTracing(const blink::WebString& category_filter) OVERRIDE;
+  virtual void disableTracing() OVERRIDE;
   virtual void startGPUEventsRecording() OVERRIDE;
   virtual void stopGPUEventsRecording() OVERRIDE;
 
   virtual void enableDeviceEmulation(
       const blink::WebRect& device_rect,
       const blink::WebRect& view_rect, float device_scale_factor,
       bool fit_to_view);
   virtual void enableDeviceEmulation(
       const blink::WebDeviceEmulationParams& params);
   virtual void disableDeviceEmulation();
@@ skipping 27 matching lines @@
   int32 gpu_route_id_;
 
   static base::subtle::AtomicWord /* TraceEventCallback */ event_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsAgent);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_H_