Add groupid for media devices. Group audio devices.

media/audio/audio_manager_base.cc

Index: media/audio/audio_manager_base.cc
diff --git a/media/audio/audio_manager_base.cc b/media/audio/audio_manager_base.cc
index bfca277e7312dcf4bfafbe188d953659876009a8..7d3c946ab179221bd42e7525e0ecf3cc77b5c8b3 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -345,6 +345,28 @@ std::string AudioManagerBase::GetAssociatedOutputDeviceID(
   return "";
 }
 
+std::string AudioManagerBase::GetGroupIDOutput(
+    const std::string& output_device_id) {
+  if (output_device_id == AudioDeviceDescription::kDefaultDeviceId) {
+    std::string real_device_id = GetDefaultOutputDeviceID();
+    if (!real_device_id.empty()) {
+      return real_device_id;
+    }
+  }
+  return output_device_id;
+}
+
+std::string AudioManagerBase::GetGroupIDInput(
+    const std::string& input_device_id) {
+  std::string output_device_id = GetAssociatedOutputDeviceID(input_device_id);
+  if (output_device_id.empty()) {
+    // Some characters are added to avoid accidentally
+    // giving the input the same group id as an output.
+    return input_device_id + "input";
+  }
+  return GetGroupIDOutput(output_device_id);
+}
+
 std::string AudioManagerBase::GetDefaultOutputDeviceID() {
   return "";
 }