Migrate WebGL timers to TaskRunnerTimer

third_party/WebKit/Source/core/dom/TaskRunnerHelper.h

Index: third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
diff --git a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
index 933c580d48c93b659fa5ac79e551ceecaaa13f86..4a08df5ab2851b49f8b26f5ece82f310abd86af6 100644
--- a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
+++ b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
@@ -98,6 +98,10 @@ enum class TaskType : unsigned {
   // https://w3c.github.io/performance-timeline/#performance-timeline
   PerformanceTimeline,
 
+  // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15
+  // This task source is used for all tasks in the WebGL spec.
+  WebGL,
+
   // Use MiscPlatformAPI for a task that is defined in the spec but is not yet
   // associated with any specific task runner in the spec. MiscPlatformAPI is
   // not encouraged for stable and matured APIs. The spec should define the task