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..62eab76751c977af2291f12a79bb4da7f355fca9 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -345,6 +345,26 @@ std::string AudioManagerBase::GetAssociatedOutputDeviceID(
   return "";
 }
 
+std::string AudioManagerBase::GetGroupIDOutput(std::string output_id) {

[Guido Urdaneta, 2016/08/29 13:59:47]

ditto

+  if (output_id == AudioDeviceDescription::kDefaultDeviceId) {
+    std::string real_id = GetDefaultOutputDeviceID();
+    if (!real_id.empty()) {
+      return real_id;
+    }
+  }
+  return output_id;
+}
+
+std::string AudioManagerBase::GetGroupIDInput(std::string input_id) {

[Guido Urdaneta, 2016/08/29 13:59:47]

ditto

+  std::string output_id = GetAssociatedOutputDeviceID(input_id);
+  if (output_id.empty()) {
+    // Some characters are added to avoid accidentally
+    // giving the input the same group id as an output.
+    return input_id + "input";
+  }
+  return GetGroupIDOutput(output_id);
+}
+
 std::string AudioManagerBase::GetDefaultOutputDeviceID() {
   return "";
 }