I was just about to submit a patch about the issue.
Defined in spec [1] as videoKind.
[1]
https://w3c.github.io/mediacapture-depth/#constrainable-properties

bug/feature - work on API implementation is ongoing.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/28ea8a96d0788781f3ef06053c921d8e740a30ef

commit 28ea8a96d0788781f3ef06053c921d8e740a30ef
Author: aleksandar.stojiljkovic <aleksandar.stojiljkovic@intel.com>
Date: Tue Feb 14 13:31:15 2017

Media Capture Depth Stream Extensions API: videoKind settings and constraint.

This enables selection of depth stream on Linux; both color and
depth device have the same Label and it is not possible to apart
depth from color stream ( https://crbug.com/686756 ).

Under experimental MediaCaptureDepth feature, implements [1]:

partial dictionary MediaTrackConstraintSet {
    ConstrainDOMString videoKind;
};

and constraining logic applying it to MediaStreamTrack object.

partial dictionary MediaTrackSettings {
    DOMString videoKind;
};

This patch is verified to work with fake capture device and RealSense SR300.

[1]
https://w3c.github.io/mediacapture-depth/#mediatracksettings-dictionary

BUG= 686756 , 616098

Review-Url: https://codereview.chromium.org/2664673002
Cr-Commit-Position: refs/heads/master@{#450335}

[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/browser/webrtc/webrtc_depth_capture_browsertest.cc
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/renderer/media/media_stream_constraints_util_video_source.cc
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/renderer/media/media_stream_constraints_util_video_source.h
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/renderer/media/media_stream_constraints_util_video_source_unittest.cc
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/renderer/media/media_stream_video_source.cc
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/renderer/media/media_stream_video_track.cc
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/test/data/media/depth_stream_test_utilities.js
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/content/test/data/media/getusermedia-depth-capture.html
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/Source/modules/mediastream/MediaConstraintsImpl.cpp
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/Source/modules/mediastream/MediaTrackConstraintSet.idl
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/Source/modules/mediastream/MediaTrackSettings.idl
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/Source/modules/mediastream/MediaTrackSupportedConstraints.idl
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/Source/platform/exported/WebMediaConstraints.cpp
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/public/platform/WebMediaConstraints.h
[modify] https://crrev.com/28ea8a96d0788781f3ef06053c921d8e740a30ef/third_party/WebKit/public/platform/WebMediaStreamTrack.h

There is way to fix the issue with name; three devices shouldn't probably display the same name: Intel RealSense 3D Camera R200 (8086:0a80).

The issue is Linux only: Windows displays names: Intel RealSense 3D Camera R200 Depth, Intel RealSense 3D Camera R200 Infrared and Intel RealSense 3D Camera R200 RGB.

There is a way to get the name of the device:
e.g.

/sys/class/video4linux/video1/device/interface:
Intel(R) RealSense(TM) Camera SR300 RGB

/sys/class/video4linux/video2/device/interface:
Intel(R) RealSense(TM) Camera SR300 Depth 

I'll start work on a patch for this.

The patch https://chromium-review.googlesource.com/c/572901/ fixes it; Razer Stargazer camera devices names look like on the attached before-after screenshot.
Note: also previously displayed name looks incorrect (as it used to show "Intel(R) RealSense(TM) Camera S" instead of "Intel(R) RealSense(TM) Camera SR300")

Deleted: before-after.png 154 KB

	before-after.png 154 KB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ed7555f98074e69a08a0fe4cf03dccb421d7fa6c

commit ed7555f98074e69a08a0fe4cf03dccb421d7fa6c
Author: Aleksandar Stojiljkovic <aleksandar.stojiljkovic@intel.com>
Date: Fri Aug 11 13:27:16 2017

Media Capture Depth Stream Extensions: split videoKind feature.

Split videoKind from MediaCaptureDepth to MediaCaptureDepthVideoKind
feature in order to ship it sooner then the other Media Capture Depth
stream API extensions.

videoKind is important as it enables constraining query (getUserMedia)
to depth stream - see https://codereview.chromium.org/2664673002/

BUG= 686756 , 616098

Change-Id: I4cca58d763278bbe74d693a2a2ff4b6801a4d126
Reviewed-on: https://chromium-review.googlesource.com/608067
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Aleksandar Stojiljkovic <aleksandar.stojiljkovic@intel.com>
Cr-Commit-Position: refs/heads/master@{#493711}
[modify] https://crrev.com/ed7555f98074e69a08a0fe4cf03dccb421d7fa6c/content/browser/webrtc/webrtc_depth_capture_browsertest.cc
[modify] https://crrev.com/ed7555f98074e69a08a0fe4cf03dccb421d7fa6c/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp
[modify] https://crrev.com/ed7555f98074e69a08a0fe4cf03dccb421d7fa6c/third_party/WebKit/Source/modules/mediastream/MediaTrackConstraintSet.idl
[modify] https://crrev.com/ed7555f98074e69a08a0fe4cf03dccb421d7fa6c/third_party/WebKit/Source/modules/mediastream/MediaTrackSettings.idl
[modify] https://crrev.com/ed7555f98074e69a08a0fe4cf03dccb421d7fa6c/third_party/WebKit/Source/modules/mediastream/MediaTrackSupportedConstraints.idl
[modify] https://crrev.com/ed7555f98074e69a08a0fe4cf03dccb421d7fa6c/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5

Changing the title and type as part of the problem is about multiple capture (sub)devices of composite camera having the same name on Linux. On Windows, this works properly (#5).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/321698ec2bac6234a1622b398a2e43504cfb80c7

commit 321698ec2bac6234a1622b398a2e43504cfb80c7
Author: Aleksandar Stojiljkovic <aleksandar.stojiljkovic@intel.com>
Date: Wed Aug 16 19:48:02 2017

Fix ambiguity with names of composited video capture devices

Webcams with multiple cameras on single device would display all
of them with the same name on Linux. This makes it look like on
Windows; using different sub cameras names.

BUG= 686756 

Change-Id: Ib717e7dd8f375ad71cfa1ea7ac19cec02337e94d
Reviewed-on: https://chromium-review.googlesource.com/572901
Commit-Queue: Aleksandar Stojiljkovic <aleksandar.stojiljkovic@intel.com>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494905}
[modify] https://crrev.com/321698ec2bac6234a1622b398a2e43504cfb80c7/media/capture/video/linux/video_capture_device_factory_linux.cc
[modify] https://crrev.com/321698ec2bac6234a1622b398a2e43504cfb80c7/media/capture/video/linux/video_capture_device_factory_linux.h