Titlebar demo with specific CSS per-platform
not yet available in webstore
mac/cros screenshot update
css drag fix for non-mac
titlebar screenshots now with borders
rename titlebar -> platform-title
Merge pull request #330 from reillyeon/device-info

Add a USB device info viewer than demos the USB device picker.
Merge pull request #332 from samthor/master

Add custom HTML/CSS titlebar demo
usb_device-info: Handle the case of a device being selected again.

If the user selects a device that the app has already been given permission
for then this patch moves the selection back to that device instead of adding
a duplicate entry to its internal list.