Telemetry / Devtools TraceHandler: exposes tracing via dev tools.

content/browser/debugger/devtools_trace_domain_handler.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_BROWSER_DEBUGGER_DEVTOOLS_TRACE_HANDLER_H_
+#define CONTENT_BROWSER_DEBUGGER_DEVTOOLS_TRACE_HANDLER_H_
+
+#include "content/browser/debugger/devtools_browser_target.h"
+#include "content/public/browser/trace_subscriber.h"
+
+namespace content {
+
+// This class bridges DevTools remote debugging server with the trace
+// infrastructure.
+class DevToolsTraceDomainHandler
+    : public TraceSubscriber,
+      public DevToolsBrowserTarget::Handler {
+ public:
+  DevToolsTraceDomainHandler();
+  ~DevToolsTraceDomainHandler();

[pfeldman, 2012/12/14 10:39:33]

virtual

[bulach, 2012/12/14 16:03:52]

Done.

+
+  // TraceSubscriber:
+  virtual void OnEndTracingComplete();
+  virtual void OnTraceDataCollected(
+      const scoped_refptr<base::RefCountedString>& trace_fragment);
+
+  // DevToolBrowserTarget::Handler:
+  virtual base::Value* OnProtocolCommand(
+      int connection_id,
+      int request_id,
+      const std::string& method,
+      const base::DictionaryValue* params) OVERRIDE;
+
+ private:
+  base::Value* BeginTracing(const base::DictionaryValue* params);
+  base::Value* EndTracingAsync(const base::DictionaryValue* params);
+  base::Value* HasCompleted(const base::DictionaryValue* params);
+  base::Value* GetAndResetTrace(const base::DictionaryValue* params);
+
+  bool has_completed_;
+
+  std::string buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsTraceDomainHandler);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEBUGGER_DEVTOOLS_TRACE_HANDLER_H_