Connect VmCameraMicManager with cras audio service

Bug: b/167491603
Change-Id: Ie4da3308869873ba57699daa4cc32659d188615e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592577
Commit-Queue: Jason Lin <lxj@google.com>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837475}

chrome/browser/chromeos/camera_mic/vm_camera_mic_manager.cc

@@ -89,8 +89,7 @@ void VmCameraMicManager::OnPrimaryUserSessionStarted(Profile* primary_profile) {
     vm_info_map_[vm] = {};
   }
 
-  // Camera service does not behave in non ChromeOS environment (e.g. testing,
-  // linux chromeos).
+  // Only do the subscription in real ChromeOS environment.
   if (base::SysInfo::IsRunningOnChromeOS() &&
       media::ShouldUseCrosCameraService()) {
     auto* camera = media::CameraHalDispatcherImpl::GetInstance();
@@ -99,6 +98,14 @@ void VmCameraMicManager::OnPrimaryUserSessionStarted(Profile* primary_profile) {
     camera->AddActiveClientObserver(this);
     OnCameraPrivacySwitchStatusChanged(
         camera->AddCameraPrivacySwitchObserver(this));
+
+    CrasAudioHandler::Get()->AddAudioObserver(this);
+    // Fetch the current value.
+    content::GetUIThreadTaskRunner({})->PostTask(
+        FROM_HERE,
+        base::BindOnce(
+            &VmCameraMicManager::OnNumberOfInputStreamsWithPermissionChanged,
+            base::Unretained(this)));
   }
 }
 
@@ -365,4 +372,21 @@ void VmCameraMicManager::VmNotificationObserver::Click(
   open_settings_.Run(profile_);
 }
 
+void VmCameraMicManager::OnNumberOfInputStreamsWithPermissionChanged() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  const auto& clients_and_numbers =
+      CrasAudioHandler::Get()->GetNumberOfInputStreamsWithPermission();
+
+  auto update = [&](CrasAudioHandler::ClientType cras_client_type, VmType vm) {
+    auto it = clients_and_numbers.find(cras_client_type);
+    bool active = (it != clients_and_numbers.end() && it->second != 0);
+
+    UpdateVmInfoAndNotifications(vm, &VmInfo::SetMicActive, active);
+  };
+
+  update(CrasAudioHandler::ClientType::VM_TERMINA, VmType::kCrostiniVm);
+  update(CrasAudioHandler::ClientType::VM_PLUGIN, VmType::kPluginVm);
+}
+
 }  // namespace chromeos

chrome/browser/chromeos/camera_mic/vm_camera_mic_manager.h

@@ -15,6 +15,7 @@
 #include "base/observer_list_types.h"
 #include "base/scoped_observation.h"
 #include "base/timer/timer.h"
+#include "chromeos/audio/cras_audio_handler.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "media/capture/video/chromeos/camera_hal_dispatcher_impl.h"
 #include "ui/message_center/public/cpp/notification.h"
@@ -31,7 +32,8 @@ namespace chromeos {
 // we will also need to make the notification ids different for different
 // profiles.
 class VmCameraMicManager : public media::CameraActiveClientObserver,
-                           public media::CameraPrivacySwitchObserver {
+                           public media::CameraPrivacySwitchObserver,
+                           public CrasAudioHandler::AudioObserver {
  public:
   enum class VmType { kCrostiniVm, kPluginVm };
 
@@ -136,6 +138,9 @@ class VmCameraMicManager : public media::CameraActiveClientObserver,
   void OnCameraPrivacySwitchStatusChanged(
       cros::mojom::CameraPrivacySwitchState state) override;
 
+  // CrasAudioHandler::AudioObserver
+  void OnNumberOfInputStreamsWithPermissionChanged() override;
+
   static std::string GetNotificationId(VmType vm, NotificationType type);
 
   void UpdateVmInfoAndNotifications(VmType vm,