Add ability to active multiple devices via the audio API.

chrome/browser/extensions/api/audio/audio_service_chromeos.cc

Index: chrome/browser/extensions/api/audio/audio_service_chromeos.cc
diff --git a/chrome/browser/extensions/api/audio/audio_service_chromeos.cc b/chrome/browser/extensions/api/audio/audio_service_chromeos.cc
index 91a0cd8880425ad149e50d1e4af9b8d7ae3ca256..ce44cf2b36862475a1350fbad37c3d7d92c6a97c 100644
--- a/chrome/browser/extensions/api/audio/audio_service_chromeos.cc
+++ b/chrome/browser/extensions/api/audio/audio_service_chromeos.cc
@@ -9,6 +9,8 @@
 #include "base/strings/string_number_conversions.h"
 #include "chromeos/audio/audio_device.h"
 #include "chromeos/audio/cras_audio_handler.h"
+#include "chromeos/dbus/cras_audio_client.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
@@ -135,22 +137,63 @@ void AudioServiceImpl::SetActiveDevices(const DeviceIdList& device_list) {
   if (!cras_audio_handler_)
     return;
 
+  // De-activate all the nodes with RemoveActive{Input/Output}Node API. This is
+  // kind of hacky, but we don't know which set of nodes are active from
+  // CrasAudioHandler.
+  // TODO(rkc): Fix it in http://crbug.com/402072.
+  chromeos::AudioDeviceList devices;
+  cras_audio_handler_->GetAudioDevices(&devices);
+  for (size_t i = 0; i < devices.size(); ++i) {
+    if (devices[i].is_input) {
+      chromeos::DBusThreadManager::Get()
+          ->GetCrasAudioClient()
+          ->RemoveActiveInputNode(devices[i].id);
+    } else {  // output
+      chromeos::DBusThreadManager::Get()
+          ->GetCrasAudioClient()
+          ->RemoveActiveOutputNode(devices[i].id);
+    }
+  }
+
   bool input_device_set = false;
   bool output_device_set = false;
-
+  std::string active_input_node_ids, active_output_node_ids;
   for (size_t i = 0; i < device_list.size(); ++i) {
     chromeos::AudioDevice device;
     bool found = FindDevice(GetIdFromStr(device_list[i]), &device);
     if (found) {
-      if (device.is_input && !input_device_set) {
-        cras_audio_handler_->SwitchToDevice(device);
-        input_device_set = true;
-      } else if (!device.is_input && !output_device_set) {
-        cras_audio_handler_->SwitchToDevice(device);
-        output_device_set = true;
+      if (device.is_input) {
+        if (!input_device_set) {
+          cras_audio_handler_->SwitchToDevice(device);
+          input_device_set = true;
+        } else {
+          active_input_node_ids.push_back(device.id);
+        }
+      } else {  // output device
+        if (!output_device_set) {
+          cras_audio_handler_->SwitchToDevice(device);
+          output_device_set = true;
+        } else {
+          active_output_node_ids.push_back(device.id);
+        }
       }
     }
   }
+
+  // Once we have set our devices to active and all the inactive ones have been
+  // set correctly to inactive, go through our active devices again and set
+  // them to active using the AddActiveNode API.
+  // TODO(rkc):Fix this ugly hack in http://crbug.com/402072.
+  for (size_t i = 0; i < active_input_node_ids.size(); ++i) {
+    chromeos::DBusThreadManager::Get()
+        ->GetCrasAudioClient()
+        ->AddActiveInputNode(active_input_node_ids[i]);
+  }
+  for (size_t i = 0; i < active_output_node_ids.size(); ++i) {
+    chromeos::DBusThreadManager::Get()
+        ->GetCrasAudioClient()
+        ->AddActiveOutputNode(active_output_node_ids[i]);
+  }
 }
 
 bool AudioServiceImpl::SetDeviceProperties(const std::string& device_id,