LGTM

The CSS Round Display has been approved for First Public Working Draft in the 
last CSS working group meeting.
The device-radius is one of key features of the specification so it would be 
good to implement it in Crosswalk.

Experimentally, I tried to run Crosswalk on Android wear devices and test this 
feature.
Web applications could be aware of display shape and apply different CSS for 
different display shapes such as round display and rectangle display.

Thanks,
Joone

-----Original Message-----
From: Crosswalk-dev [mailto:[email protected]] 
On Behalf Of Hyojin Song
Sent: Wednesday, August 5, 2015 11:51 PM
To: 'Crosswalk-dev' <[email protected]>
Subject: [Crosswalk-dev] Intent to Implement: Support the 'device-radius' media 
feature in CSS Media Queries

**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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