Uncomment ol.render.canvas.Immediate#drawCircleGeometry
Merge pull request #1529 from fredj/vector-api-immediate-drawCircleGeometry

Uncomment ol.render.canvas.Immediate#drawCircleGeometry
Add export for ol.geom.LineString#getLength
Add draw interaction events
Add tests for draw interaction events
Merge pull request #1532 from oterral/vector-api-exports

[vector-api] Add export for ol.geom.LineString#getLength
Merge pull request #1524 from oterral/vector-api

[vector-api] Add draw events
Only support square tiles
Rename devicePixelRatio to pixelRatio in ol.FrameState
Merge pull request #1534 from twpayne/vector-api-pixel-ratio

[vector-api] Rename devicePixelRatio to pixelRatio in ol.FrameState
Merge pull request #1535 from twpayne/vector-api-square-tiles

[vector-api] Only support square tiles
Add pixelRatio to ol.TileUrlFunction
Add pixelRatio to ol.source.Tile#getTile
Add ol.source.Tile#getTileGridForProjection
Use ol.source.Tile#getTileGridForProjection
Add ol.source.Tile#getTilePixelSize
Add HiDPI support to ol.renderer.canvas.TileLayer
Add HiDPI support to ol.renderer.webgl.TileLayer
fixup! Add HiDPI support to ol.renderer.canvas.TileLayer
fixup! Add HiDPI support to ol.renderer.webgl.TileLayer