webgl: Add more owners

Bug: None
Change-Id: I889d9ebbe9d8e5b33750bb1c12ae6121b14899bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398970Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805358}

third_party/blink/renderer/platform/graphics/gpu/OWNERS

@@ -2,3 +2,15 @@
 # there are a couple used by accelerated 2D canvas as well.
 
 # COMPONENT: Blink>WebGL
+
+# WebGL, WebGPU, Dawn, etc.
+kainino@chromium.org
+enga@chromium.org
+cwallez@chromium.org
+
+# WebXR
+bajones@chromium.org
+klausw@chromium.org
+
+# SharedGpuContext, ImageLayerBridge, etc.
+khushalsagar@chromium.org