Web MIDI Linux: Fix enumeration when OPL3 devices are present, and fix manufacturer extraction bugs

media/midi/midi_manager_alsa_unittest.cc

Index: media/midi/midi_manager_alsa_unittest.cc
diff --git a/media/midi/midi_manager_alsa_unittest.cc b/media/midi/midi_manager_alsa_unittest.cc
index 6ce46171ecd73ec92d4ae430fadc81aea42802d0..1a29334c9adab14cddf82e0b6dbeeb15c082b4dd 100644
--- a/media/midi/midi_manager_alsa_unittest.cc
+++ b/media/midi/midi_manager_alsa_unittest.cc
@@ -51,6 +51,14 @@ TEST(MidiManagerAlsaTest, ExtractManufacturer) {
                     "Serial MIDI (UART16550A) [Soundcanvas] at 0x3f8, irq 4"));
   ASSERT_EQ("", MidiManagerAlsa::AlsaRawmidi::ExtractManufacturerString(
                     "", "", "", "VirMIDI", "Virtual MIDI Card 1"));
+  ASSERT_EQ("C-Media Electronics Inc",
+            MidiManagerAlsa::AlsaRawmidi::ExtractManufacturerString(
+                "", "0x13f6", "C-Media Electronics Inc", "C-Media CMI8738 MIDI",
+                "C-Media CMI8738 (model 55) at 0xd000, irq 19"));
+  ASSERT_EQ("C-Media Electronics Inc",
+            MidiManagerAlsa::AlsaRawmidi::ExtractManufacturerString(
+                "", "0x13f6", "C-Media Electronics Inc", "C-Media CMI8738 FM",
+                "C-Media CMI8738 (model 55) at 0xd000, irq 19"));
 }
 
 TEST(MidiManagerAlsaTest, JSONPortMetadata) {