Looking up device id by session id for AudioRendererMixerInput

media/base/fake_output_device.h

Index: media/base/fake_output_device.h
diff --git a/media/base/fake_output_device.h b/media/base/fake_output_device.h
index 45a6abb7cfdfd20adae2dc7a59d99a88d11c8c45..326861572a33f470ed25e9c97bd858f79bdb8abe 100644
--- a/media/base/fake_output_device.h
+++ b/media/base/fake_output_device.h
@@ -16,6 +16,7 @@ class FakeOutputDevice : public OutputDevice {
  public:
   FakeOutputDevice();
   explicit FakeOutputDevice(OutputDeviceStatus status);
+  FakeOutputDevice(OutputDeviceStatus status, const AudioParameters& params);
   ~FakeOutputDevice() override;
 
   // OutputDevice implementation.
@@ -26,7 +27,8 @@ class FakeOutputDevice : public OutputDevice {
   OutputDeviceStatus GetDeviceStatus() override;
 
  private:
-  OutputDeviceStatus device_status_;
+  const OutputDeviceStatus status_;
+  const AudioParameters params_;
   DISALLOW_COPY_AND_ASSIGN(FakeOutputDevice);
 };