Support GetGroupIDInput/Output on LaCrOS

Support GetGroupIDInput/Output, which is modified from the same function
in audio_manager_chromeos.cc

BUG=b:173113548

Change-Id: I3a00ebabd5e14f1ca087cab491d6747baaa7eb9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536663
Commit-Queue: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828561}

media/audio/cras/audio_manager_cras.cc

@@ -129,6 +129,26 @@ std::string AudioManagerCras::GetDefaultOutputDeviceID() {
   return base::NumberToString(GetPrimaryActiveOutputNode());
 }
 
+std::string AudioManagerCras::GetGroupIDInput(const std::string& device_id) {
+  for (const auto& device : CrasGetAudioDevices(DeviceType::kInput)) {
+    if (base::NumberToString(device.id) == device_id ||
+        (AudioDeviceDescription::IsDefaultDevice(device_id) && device.active)) {
+      return device.dev_name;
+    }
+  }
+  return "";
+}
+
+std::string AudioManagerCras::GetGroupIDOutput(const std::string& device_id) {
+  for (const auto& device : CrasGetAudioDevices(DeviceType::kOutput)) {
+    if (base::NumberToString(device.id) == device_id ||
+        (AudioDeviceDescription::IsDefaultDevice(device_id) && device.active)) {
+      return device.dev_name;
+    }
+  }
+  return "";
+}
+
 AudioParameters AudioManagerCras::GetPreferredOutputStreamParameters(
     const std::string& output_device_id,
     const AudioParameters& input_params) {
@@ -173,7 +193,7 @@ uint64_t AudioManagerCras::GetPrimaryActiveOutputNode() {
 }
 
 bool AudioManagerCras::IsDefault(const std::string& device_id, bool is_input) {
-  return device_id == AudioDeviceDescription::kDefaultDeviceId;
+  return AudioDeviceDescription::IsDefaultDevice(device_id);
 }
 
 enum CRAS_CLIENT_TYPE AudioManagerCras::GetClientType() {

media/audio/cras/audio_manager_cras.h

@@ -33,6 +33,8 @@ class MEDIA_EXPORT AudioManagerCras : public AudioManagerCrasBase {
       const std::string& device_id) override;
   std::string GetDefaultInputDeviceID() override;
   std::string GetDefaultOutputDeviceID() override;
+  std::string GetGroupIDInput(const std::string& device_id) override;
+  std::string GetGroupIDOutput(const std::string& device_id) override;
 
   // AudioManagerCrasBase implementation.
   bool IsDefault(const std::string& device_id, bool is_input) override;

media/audio/cras/cras_util.cc

@@ -73,6 +73,7 @@ CrasDevice::CrasDevice(const cras_ionode_info* node,
   // If the name of node is not meaningful, use the device name instead.
   if (name.empty() || name == "(default)")
     name = dev->name;
+  dev_name = dev->name;
 }
 
 // Creates a CrasDevice based on the node list.

media/audio/cras/cras_util.h

@@ -27,6 +27,7 @@ struct CrasDevice {
   uint64_t id;
   int32_t active;
   std::string name;
+  std::string dev_name;
 };
 
 // Enumerates all devices of |type|.