This includes supporting sophisticated constraints (such as, e.g. 
ConstrainDOMStringParameters) and supporting more than one 
|advanced| constraint vector entry, both in method [1].

[1] https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/imagecapture/ImageCapture.cpp?type=cs&q=ImageCapture::setMediaTrackConstraints&l=251

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1d5b6a1cd0258c12363b53f0d382471141463abe

commit 1d5b6a1cd0258c12363b53f0d382471141463abe
Author: mcasas <mcasas@chromium.org>
Date: Thu Apr 06 17:31:29 2017

Image Capture: make sure applyConstraints() only works for ImageCapture constraints

This CL:
 - makes sure MediaStreamTrack::applyConstraints() is rejected if non
 image-capture related constraints are passed; (this follows the
 Spec e.g. in [1], " If the constraints cannot be applied, the promise is
 rejected").

- generally cleans up  MediaStreamTrack::applyConstraints() moving
 part of the TODO()s to Image Capture so that they are in the
 same place (facilitates later reviews).

 - derives to clearMediaTrackConstraints() if the constraint set is
 empty, after spec issue somehow clarified it

LayoutTests updated/extended.

[1] https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack/applyConstraints#Return_value

BUG= 700607 , 708723

Review-Url: https://codereview.chromium.org/2804653003
Cr-Commit-Position: refs/heads/master@{#462531}

[modify] https://crrev.com/1d5b6a1cd0258c12363b53f0d382471141463abe/third_party/WebKit/LayoutTests/fast/imagecapture/MediaStreamTrack-applyConstraints.html
[modify] https://crrev.com/1d5b6a1cd0258c12363b53f0d382471141463abe/third_party/WebKit/LayoutTests/fast/imagecapture/MediaStreamTrack-getConstraints.html
[modify] https://crrev.com/1d5b6a1cd0258c12363b53f0d382471141463abe/third_party/WebKit/Source/modules/imagecapture/ImageCapture.cpp
[modify] https://crrev.com/1d5b6a1cd0258c12363b53f0d382471141463abe/third_party/WebKit/Source/modules/imagecapture/ImageCapture.h
[modify] https://crrev.com/1d5b6a1cd0258c12363b53f0d382471141463abe/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp

Removing myself as owner of these issues are marking them 
for retriaging.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5f447acc481e3277bed61e2bb6d308b4d36362ce

commit 5f447acc481e3277bed61e2bb6d308b4d36362ce
Author: Guido Urdaneta <guidou@chromium.org>
Date: Wed Oct 25 20:31:02 2017

Make MediaStreamTrack.applyConstraints resolve its promise with void.

This is a spec-compliance change.

Bug: 708723
Change-Id: I36f7405b259013d731ecc028dcc55c75c8c26620
Reviewed-on: https://chromium-review.googlesource.com/727986
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#511571}
[modify] https://crrev.com/5f447acc481e3277bed61e2bb6d308b4d36362ce/content/test/data/media/image_capture_test.html
[modify] https://crrev.com/5f447acc481e3277bed61e2bb6d308b4d36362ce/third_party/WebKit/LayoutTests/imagecapture/MediaStreamTrack-applyConstraints.html
[modify] https://crrev.com/5f447acc481e3277bed61e2bb6d308b4d36362ce/third_party/WebKit/Source/modules/imagecapture/ImageCapture.cpp
[modify] https://crrev.com/5f447acc481e3277bed61e2bb6d308b4d36362ce/third_party/WebKit/Source/modules/imagecapture/ImageCapture.h
[modify] https://crrev.com/5f447acc481e3277bed61e2bb6d308b4d36362ce/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.idl