Pass camera facing info to audio client

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index bf849b7102faea1e3a43481ba86002731013d640..ee0827b1c46d850404be0a150020d5e6def3b787 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -95,6 +95,7 @@
 #include "media/audio/audio_system_impl.h"
 #include "media/base/media.h"
 #include "media/base/user_input_monitor.h"
+#include "media/base/video_facing.h"
 #include "media/midi/midi_service.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "mojo/edk/embedder/scoped_ipc_support.h"
@@ -163,7 +164,9 @@
 
 #if defined(OS_CHROMEOS)
 #include "base/memory/memory_pressure_monitor_chromeos.h"
+#include "chromeos/audio/cras_audio_handler.h"
 #include "chromeos/chromeos_switches.h"
+#include "media/capture/video/linux/video_capture_observer_chromeos.h"
 #endif
 
 #if defined(USE_GLIB)
@@ -1164,6 +1167,20 @@ int BrowserMainLoop::PreMainMessageLoopRun() {
         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 
     parts_->PreMainMessageLoopRun();
+
+#if defined(OS_CHROMEOS)
+    if (chromeos::CrasAudioHandler::IsInitialized()) {
+      if (media_stream_manager_.get() != NULL) {
+        media_stream_manager_->SetVideoCaptureObserver(
+            base::MakeUnique<media::VideoCaptureObserverChromeOS>(
+                chromeos::CrasAudioHandler::Get()));
+      } else {
+        DLOG(ERROR) << "media_stream_manager_ is null.";
+      }
+    } else {
+      DLOG(ERROR) << "CrasAudioHandler is not initialized.";
+    }
+#endif
   }
 
   // If the UI thread blocks, the whole UI is unresponsive.
@@ -1213,6 +1230,7 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
   if (parts_) {
     TRACE_EVENT0("shutdown",
                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
+    media_stream_manager_->SetVideoCaptureObserver(nullptr);
     parts_->PostMainMessageLoopRun();
   }