[canvaskit] Update to 0.21.0

Change-Id: Id093d3026bdb406b66374839820ae44a7696a981
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/345096
Reviewed-by: Kevin Lubick <kjlubick@google.com>

modules/canvaskit/CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.21.0] - 2020-12-16
+
 ### Added
  - `getImageInfo()` and `getColorSpace()` to the `Image` type.
  - `CanvasKit.deleteContext()` for deleting WebGL contexts when done with them, resizing, etc.

modules/canvaskit/canvaskit/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "canvaskit-wasm",
-  "version": "0.20.0",
+  "version": "0.21.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

modules/canvaskit/canvaskit/package.json

@@ -1,6 +1,6 @@
 {
   "name": "canvaskit-wasm",
-  "version": "0.20.0",
+  "version": "0.21.0",
   "description": "A WASM version of Skia's Canvas API",
   "main": "bin/canvaskit.js",
   "homepage": "https://github.com/google/skia/tree/master/modules/canvaskit",