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..6dce18bb432b9a0d87928d6ff2617acfdb34ac86
--- /dev/null
+++ b/chrome/browser/media/rtc_event_log_handler.h
@@ -0,0 +1,92 @@
+// 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/callback.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/thread_checker.h"
+#include "base/time/time.h"
+
+namespace content {
+class RenderProcessHost;
+}  // namespace content
+class Profile;
+
+// WebRtcEventLogHandler provides an interface to start and stop
+// the WebRTC event log.
+class WebRtcEventLogHandler
+    : public base::RefCountedThreadSafe<WebRtcEventLogHandler> {
+ public:
+  typedef base::Callback<void(bool, const std::string&)> GenericDoneCallback;
+  typedef base::Callback<void(const std::string&)> RecordingErrorCallback;
+  typedef base::Callback<void(const std::string&, bool, bool)>
+      RecordingDoneCallback;
+
+  // Key used to attach the handler to the RenderProcessHost.
+  static const char kWebRtcEventLogHandlerKey[];
+
+  explicit WebRtcEventLogHandler(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
+  // StopWebRtcEventLogging()
+  // 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 StartWebRtcEventLogging(content::RenderProcessHost* host,
+                               base::TimeDelta delay,
+                               const RecordingDoneCallback& callback,
+                               const RecordingErrorCallback& 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 StopWebRtcEventLogging(content::RenderProcessHost* host,
+                              const RecordingDoneCallback& callback,
+                              const RecordingErrorCallback& error_callback);
+
+ private:
+  friend class base::RefCountedThreadSafe<WebRtcEventLogHandler>;
+  virtual ~WebRtcEventLogHandler();
+
+  base::FilePath GetLogDirectoryAndEnsureExists();
+
+  // Helper for starting RTC event logs.
+  void DoStartWebRtcEventLogging(content::RenderProcessHost* host,
+                                 base::TimeDelta delay,
+                                 const RecordingDoneCallback& callback,
+                                 const RecordingErrorCallback& error_callback,
+                                 const base::FilePath& log_directory);
+
+  // Helper for stopping RTC event logs.
+  void DoStopWebRtcEventLogging(content::RenderProcessHost* host,
+                                bool is_manual_stop,
+                                uint64_t audio_debug_recordings_id,
+                                const RecordingDoneCallback& callback,
+                                const RecordingErrorCallback& 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_;
+
+  base::ThreadChecker thread_checker_;
+  DISALLOW_COPY_AND_ASSIGN(WebRtcEventLogHandler);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_RTC_EVENT_LOG_HANDLER_H_