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..80dfc838d27409e2eee9f9644f2f71ac7f07a952 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,
@@ -107,6 +109,10 @@ class CONTENT_EXPORT AudioInputRendererHost
                          AudioMirroringManager* audio_mirroring_manager,
                          media::UserInputMonitor* user_input_monitor);
 
+  // Enable and disable debug recording of input on all audio entries.
+  void EnableDebugRecording(const base::FilePath& file);
+  void DisableDebugRecording();
+
   // BrowserMessageFilter implementation.
   void OnChannelClosing() override;
   void OnDestruct() const override;
@@ -210,6 +216,19 @@ class CONTENT_EXPORT AudioInputRendererHost
   void MaybeUnregisterKeyboardMicStream(
       const AudioInputHostMsg_CreateStream_Config& config);
 
+  void MaybeEnableDebugRecordingForId(int stream_id);
+
+  base::FilePath GetDebugRecordingFilePathWithExtensions(
+      const base::FilePath& file);
+
+  void EnabledDebugRecordingForId(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);
+
   // ID of the RenderProcessHost that owns this instance.
   const int render_process_id_;
 
@@ -229,6 +248,8 @@ class CONTENT_EXPORT AudioInputRendererHost
 
   scoped_ptr<media::AudioLog> audio_log_;
 
+  base::WeakPtrFactory<AudioInputRendererHost> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioInputRendererHost);
 };