[PowerProfiler] Power profiler service keeps running even after devtools frontend has been closed.

content/browser/devtools/devtools_power_handler.h

Index: content/browser/devtools/devtools_power_handler.h
diff --git a/content/browser/devtools/devtools_power_handler.h b/content/browser/devtools/devtools_power_handler.h
index f645392a1993a81a139f4e56d85f89638097111d..c6655ddcb1a279e0f5ae30705aec925f74c312aa 100644
--- a/content/browser/devtools/devtools_power_handler.h
+++ b/content/browser/devtools/devtools_power_handler.h
@@ -11,12 +11,14 @@
 
 namespace content {
 
+class DevToolsAgentHost;
+
 // This class provides power information to DevTools.
 class DevToolsPowerHandler
     : public DevToolsProtocol::Handler,
       public PowerProfilerObserver {
  public:
-  DevToolsPowerHandler();
+  DevToolsPowerHandler(DevToolsAgentHost*);

[yurys, 2014/06/18 15:20:59]

should be explicit

   virtual ~DevToolsPowerHandler();
 
   // PowerProfilerObserver override.
@@ -29,6 +31,11 @@ class DevToolsPowerHandler
       scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> OnCanProfilePower(
       scoped_refptr<DevToolsProtocol::Command> command);
+  void OnDevToolsStateChanged(content::DevToolsAgentHost* agent_host,
+                              bool attached);
+
+  DevToolsAgentHost* devtools_agent_host_;
+  base::Callback<void(content::DevToolsAgentHost*, bool)> devtools_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsPowerHandler);
 };