[canvaskit] Update CHANGELOG on WebGPU support

Bug: skia:12512
Change-Id: I0e49d44615af5c44b9eff4be96b77b51cf6a789c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/554693
Reviewed-by: Kevin Lubick <kjlubick@google.com>

modules/canvaskit/CHANGELOG.md

diff --git a/modules/canvaskit/CHANGELOG.md b/modules/canvaskit/CHANGELOG.md
index 5ec2cfc..08e19fe 100644
--- a/modules/canvaskit/CHANGELOG.md
+++ b/modules/canvaskit/CHANGELOG.md
@@ -6,6 +6,18 @@
 
 ## [Unreleased]
 
+### Added
+ - WebGPU support. Introduced `CanvasKit.MakeGPUDeviceContext`, `CanvasKit.MakeGPUCanvasContext`,
+   `CanvasKit.MakeGPUCanvasSurface`, and `CanvasKit.MakeGPUTextureSurface` which are compatible with
+   WebGPU `GPUDevice` and `GPUTexture` objects.
+ - Typescript definitions for WebGPU API functions that are compatible with `@webgpu/types`
+   (https://www.npmjs.com/package/@webgpu/types).
+ - `CanvasKit.MakeCanvasSurface` is now deprecated. Clients should specify a backend target
+   explicitly using `CanvasKit.MakeSWCanvasSurface`, `CanvasKit.MakeOnScreenGLSurface`,
+   `CanvasKit.MakeGPUCanvasSurface`, and `CanvasKit.MakeGPUTextureSurface`.
+ - `CanvasKit.MakeGrContext` is now deprecated. Clients should use `CanvasKit.MakeWebGLContext` and
+   `CanvasKit.MakeGPUDeviceContext` instead.
+
 ### Fixed
  - Minor bug fixes in the TypeScript type declaration.
  - Creating a Premul Image from a TextureSource should upload the texture to WebGL correctly.