Implement writing mic audio input data to file for debugging purposes.

content/browser/renderer_host/media/audio_input_renderer_host.h

Index: content/browser/renderer_host/media/audio_input_renderer_host.h
diff --git a/content/browser/renderer_host/media/audio_input_renderer_host.h b/content/browser/renderer_host/media/audio_input_renderer_host.h
index eca0a6499be6500d51175484825cb041dcc6cda8..64e8fa611150a7ed073278c79ccd703b5c6adb95 100644
--- a/content/browser/renderer_host/media/audio_input_renderer_host.h
+++ b/content/browser/renderer_host/media/audio_input_renderer_host.h
@@ -32,6 +32,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
+#include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "content/common/media/audio_messages.h"
@@ -51,6 +52,7 @@ class UserInputMonitor;
 namespace content {
 class AudioMirroringManager;
 class MediaStreamManager;
+class RenderProcessHost;
 
 class CONTENT_EXPORT AudioInputRendererHost
     : public BrowserMessageFilter,
@@ -102,11 +104,18 @@ class CONTENT_EXPORT AudioInputRendererHost
   // Called from UI thread from the owner of this object.
   // |user_input_monitor| is used for typing detection and can be NULL.
   AudioInputRendererHost(int render_process_id,
+                         int32 renderer_pid,
                          media::AudioManager* audio_manager,
                          MediaStreamManager* media_stream_manager,
                          AudioMirroringManager* audio_mirroring_manager,
                          media::UserInputMonitor* user_input_monitor);
 
+#if defined(ENABLE_WEBRTC)
+  // Enable and disable debug recording of input on all audio entries.
+  void EnableDebugRecording(const base::FilePath& file);
+  void DisableDebugRecording();
+#endif
+
   // BrowserMessageFilter implementation.
   void OnChannelClosing() override;
   void OnDestruct() const override;
@@ -122,6 +131,10 @@ class CONTENT_EXPORT AudioInputRendererHost
   void OnLog(media::AudioInputController* controller,
              const std::string& message) override;
 
+  // Sets the PID renderer. This is used for constructing the debug recording
+  // filename.
+  void set_renderer_pid(int32 renderer_pid);
+
  private:
   // TODO(henrika): extend test suite (compare AudioRenderHost)
   friend class BrowserThread;
@@ -210,9 +223,28 @@ class CONTENT_EXPORT AudioInputRendererHost
   void MaybeUnregisterKeyboardMicStream(
       const AudioInputHostMsg_CreateStream_Config& config);
 
+#if defined(ENABLE_WEBRTC)
+  void MaybeEnableDebugRecordingForId(int stream_id);
+
+  base::FilePath GetDebugRecordingFilePathWithExtensions(
+      const base::FilePath& file);
+
+  void EnableDebugRecordingForId(const base::FilePath& file, int stream_id);
+
+  void DoEnableDebugRecording(int stream_id, base::File file);
+  void DoDisableDebugRecording(int stream_id);
+
+  // Delete the debug writer used for debug recordings for |stream_id|.
+  void DeleteDebugWriter(int stream_id);
+#endif
+
   // ID of the RenderProcessHost that owns this instance.
   const int render_process_id_;
 
+  // PID of the render process connected to the RenderProcessHost that owns this
+  // instance.
+  int32 renderer_pid_;
+
   // Used to create an AudioInputController.
   media::AudioManager* audio_manager_;
 
@@ -229,6 +261,8 @@ class CONTENT_EXPORT AudioInputRendererHost
 
   scoped_ptr<media::AudioLog> audio_log_;
 
+  base::WeakPtrFactory<AudioInputRendererHost> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioInputRendererHost);
 };