Win Video Capture: add DirectShow WDM devices capabilities enumeration.

media/video/capture/video_capture_device.h

Index: media/video/capture/video_capture_device.h
diff --git a/media/video/capture/video_capture_device.h b/media/video/capture/video_capture_device.h
index 382dad6cdc461d7d6d20bf04ab8e7e91693ae503..901d57426ac544a63b84b5cd2f5205fbb5fc9816 100644
--- a/media/video/capture/video_capture_device.h
+++ b/media/video/capture/video_capture_device.h
@@ -46,7 +46,7 @@ class MEDIA_EXPORT VideoCaptureDevice {
     enum CaptureApiType {
       MEDIA_FOUNDATION,
       DIRECT_SHOW,
-      DIRECT_SHOW_WDM,
+      DIRECT_SHOW_WDM_CROSSBAR,
       API_TYPE_UNKNOWN
     };
 #endif
@@ -106,6 +106,16 @@ class MEDIA_EXPORT VideoCaptureDevice {
       return capture_api_class_.capture_api_type();
     }
 #endif
+#if defined(OS_WIN)
+    // Certain devices need an ID different from the |unique_id_| for
+    // capabilities retrieval.
+    const std::string& capabilities_id() const {
+      return capabilities_id_;
+    }
+    void set_capabilities_id(const std::string& id) {
+      capabilities_id_ = id;
+    }
+#endif
 #if defined(OS_MACOSX)
     TransportType transport_type() const {
       return transport_type_;
@@ -139,6 +149,10 @@ class MEDIA_EXPORT VideoCaptureDevice {
 
     CaptureApiClass capture_api_class_;
 #endif
+#if defined(OS_WIN)
+    // ID used for capabilities retrieval. By default is equal to |unique_id|.
+    std::string capabilities_id_;
+#endif
 #if defined(OS_MACOSX)
     TransportType transport_type_;
     // Flag used to mark blacklisted devices for QTKit Api.