Start and stop RTC event logs from private extension API.

chrome/browser/media/rtc_event_log_handler.h

Index: chrome/browser/media/rtc_event_log_handler.h
diff --git a/chrome/browser/media/rtc_event_log_handler.h b/chrome/browser/media/rtc_event_log_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..870882fc31404c99eaea72541c96ed0ce24067b3
--- /dev/null
+++ b/chrome/browser/media/rtc_event_log_handler.h
@@ -0,0 +1,97 @@
+// Copyright 2016 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 CHROME_BROWSER_MEDIA_RTC_EVENT_LOG_HANDLER_H_
+#define CHROME_BROWSER_MEDIA_RTC_EVENT_LOG_HANDLER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "build/build_config.h"
+#include "content/public/browser/browser_message_filter.h"
+#include "content/public/browser/render_process_host.h"
+#include "net/base/network_interfaces.h"
+
+class Profile;
+
+// RtcEventLogHandler provides an interface to the internal logs
+// in WebRTC:
+// - Starts and stops AudioDebugRecordings, aka AEC dumps.

[Henrik Grunell, 2016/02/23 15:29:10]

Remove this line and rewrite without any bullet.

[terelius-chromium, 2016/03/02 10:01:10]

Done.

+// - Starts and stops RTC event logs.

[Guido Urdaneta, 2016/02/23 13:57:34]

And this one is only for RTC event logs.
WebRtcEventLogHandler as class name?

[Henrik Grunell, 2016/02/23 15:29:10]

Agree with that name suggestion. (Sorry if I previously suggested the one you
used now...)

[terelius-chromium, 2016/03/02 10:01:10]

Done.

+class RtcEventLogHandler
+    : public base::RefCountedThreadSafe<RtcEventLogHandler> {
+ public:
+  typedef base::Callback<void(bool, const std::string&)> GenericDoneCallback;
+  typedef base::Callback<void(const std::string&)>
+      TimeLimitedRecordingErrorCallback;

[Henrik Grunell, 2016/02/23 15:29:10]

Drop "TimeLimited".

[terelius-chromium, 2016/03/02 10:01:10]

Done.

+  typedef base::Callback<void(const std::string&, bool, bool)>
+      TimeLimitedRecordingCallback;
+
+  // Key used to attach the handler to the RenderProcessHost

[Henrik Grunell, 2016/02/23 15:29:10]

Nit: End with .

[terelius-chromium, 2016/03/02 10:01:10]

Done.

+  static const char kRtcEventLogHandlerKey[];
+
+  explicit RtcEventLogHandler(Profile* profile);
+
+  // Starts an RTC event log. The call writes the most recent events to a
+  // file and then starts logging events for the given |delay|.
+  // If |delay| is zero, the logging will continue until StopRtcEventLogging()
+  // is explicitly invoked.
+  // |callback| is invoked once recording stops. If |delay| is zero
+  // |callback| is invoked once recording starts.
+  // If a recording was already in progress, |error_callback| is invoked instead
+  // of |callback|.
+  void StartRtcEventLogging(
+      content::RenderProcessHost* host,
+      base::TimeDelta delay,
+      const TimeLimitedRecordingCallback& callback,
+      const TimeLimitedRecordingErrorCallback& error_callback);
+
+  // Stops an RTC event log. |callback| is invoked once recording
+  // stops. If no recording was in progress, |error_callback| is invoked instead
+  // of |callback|.
+  void StopRtcEventLogging(
+      content::RenderProcessHost* host,
+      const TimeLimitedRecordingCallback& callback,
+      const TimeLimitedRecordingErrorCallback& error_callback);
+
+ private:
+  friend class content::BrowserThread;

[Henrik Grunell, 2016/02/23 15:29:10]

These three needed?

[terelius-chromium, 2016/03/02 10:01:10]

Based on a comment in base/memory/ref_counted.h, I believe
friend class base::RefCountedThreadSafe<WebRtcEventLogHandler>;
is recommended unless you provide a custom Traits class.
I removed the others.

[Henrik Grunell, 2016/03/10 21:33:34]

Acknowledged.

+  friend class base::DeleteHelper<RtcEventLogHandler>;
+  friend class base::RefCountedThreadSafe<RtcEventLogHandler>;
+
+  virtual ~RtcEventLogHandler();
+
+  base::FilePath GetLogDirectoryAndEnsureExists();
+
+  // Helper for starting RTC event logs.
+  void DoStartRtcEventLogging(
+      content::RenderProcessHost* host,
+      base::TimeDelta delay,
+      const TimeLimitedRecordingCallback& callback,
+      const TimeLimitedRecordingErrorCallback& error_callback,
+      const base::FilePath& log_directory);
+
+  // Helper for stopping RTC event logs.
+  void DoStopRtcEventLogging(
+      content::RenderProcessHost* host,
+      bool is_manual_stop,
+      uint64_t audio_debug_recordings_id,
+      const TimeLimitedRecordingCallback& callback,
+      const TimeLimitedRecordingErrorCallback& error_callback,
+      const base::FilePath& log_directory);
+
+  // The profile associated with our renderer process.
+  Profile* const profile_;
+
+  // Must be accessed on the UI thread.
+  bool is_rtc_event_logging_in_progress_;
+
+  // This counter allows saving each log in a separate file.
+  uint64_t current_rtc_event_log_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(RtcEventLogHandler);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_RTC_EVENT_LOG_HANDLER_H_