update for cursor
check point#1 for screen constraint
Merge branch 'master' of https://github.com/vagouzhou/gecko-dev
create deviceinfo by config , screen or video
cache config ,create capture by config, screen capture or video capture
add proxy deviceinfo for screen sharing ,implement video's DeviceInfo interfaces, then reuse video engine pipeline
as vie_inut_manager.cc
implement 2 new interfaces for screen sharing
define CaptureDeviceType for screen sharing, reuse video pipeline, need one type indidator to know engine is for common video or screen sharing
emuerate screen monitors and running applications
support screen sharing device emurate