Split out audio debug recording from RenderProcessHostImpl.

content/common/media/audio_debug_recording.mojom

Index: content/common/media/audio_debug_recording.mojom
diff --git a/content/common/media/audio_debug_recording.mojom b/content/common/media/audio_debug_recording.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..223e2156c4b5c0bd48e3583a0456532f2902e392
--- /dev/null
+++ b/content/common/media/audio_debug_recording.mojom
@@ -0,0 +1,17 @@
+// Copyright 2015 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.
+
+module content;
+
+// Interface to observe whether to enable or disable audio debug recording.
+interface AudioDebugRecordingObserver {
+  Enable(handle file_handle);

[Henrik Grunell, 2015/10/15 12:17:03]

Today we have two different recordings. This specifically enables AEC dump. The
other kind (mic input) is in the browser process. For extension simplicity I
think we can keep the generic naming AudioDebugRecording here and for the
classes. But let the handle naming reflect that it's an AEC dump file, e.g.
"aec_dump_file_handle".

[Anand Mistry (off Chromium), 2015/10/21 03:58:24]

Done.

+  Disable();
+};
+
+interface AudioDebugRecording {
+  // Registers an audio debug recording observer. To unregister, delete/unbind
+  // the observer.
+  RegisterObserver(int32 id, AudioDebugRecordingObserver observer);
+};