**Description**
CSS Round Display spec is officially being developed in the W3C CSS Working
Group. 
I proposed this spec in CSS working group and became an editor of the
css-round-display spec as follows.
https://drafts.csswg.org/css-round-display/

There are several proposed ideas in the specification, and I would like to
contribute the 'device-radius' media feature as one of the CSS Media
Queries' features. This feature has been discussed in the CSS WG mailing
list and F2F meeting so that it has become mature in the process. The use
case of the property is very clear and reasonable as several devices with
round display are recently released. According to the value of
'device-radius', it could identify the shape of a display such as a
rectangle, a rectangle with rounded corners, a round, and an ellipse. Please
find the details below link.
https://drafts.csswg.org/css-round-display/#device-radius-media-feature

**Affected component**
chromium-crosswalk, blink-crosswalk

**Related feature**
XWALK-4734
https://crosswalk-project.org/jira/browse/XWALK-4734

**Target release**
Crosswalk-16

**Implementation details**
1. A new media feature(device-radius) should be supported within CSS Media
Queries syntax.
2. The algorithm of device-radius is similar to border-radius mechanism
except for a little factors.
  - border-radius' specification:
https://drafts.csswg.org/css-backgrounds-3/#the-border-radius
3. CSS Round Display spec provides more information about principle of
device-radius
4. CSS Round Display: https://drafts.csswg.org/css-round-display/

Thanks,
- hyojin


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