Use the scheduling mechanism provided by the platform

public/platform/WebScheduler.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebScheduler_h
+#define WebScheduler_h
+
+#include "WebThread.h"
+
+namespace blink {
+
+class WebTraceLocation;
+
+// This class is used to submit tasks and pass other information from Blink to
+// the platform's scheduler.
+class WebScheduler {
+public:
+    virtual ~WebScheduler() { }
+
+    // An IdleTask is passed a deadline in CLOCK_MONOTONIC seconds and is
+    // expected to complete before this deadline.
+    class IdleTask {
+    public:
+        virtual ~IdleTask() { }
+        virtual void run(double deadlineSeconds) = 0;
+    };
+
+    // Called during Blink's shutdown to delete any pending tasks from the
+    // scheduler. Must be called on the main thread.
+    virtual void shutdown() { }

[jochen (gone - plz use gerrit), 2014/10/24 11:42:12]

nit, why not make them all pure virtual?

[Sami, 2014/10/24 12:01:33]

Simply because the implementation lives in Chromium and if you make things that
cross repo boundaries pure virtual, you're gonna have a bad time. Many of the
other platform interfaces use this convention. Once the repos merge we can be
more strict.

+
+    // Returns true if there is high priority work pending on the main thread
+    // and the caller should yield to let the scheduler service that work.
+    // Must be called on the main thread.
+    virtual bool shouldYieldForHighPriorityWork() { return false; }
+
+    // Schedule an idle task to run the Blink main thread. For non-critical
+    // tasks which may be reordered relative to other task types and may be
+    // starved for an arbitrarily long time if no idle time is available.
+    // Takes ownership of |IdleTask|. Can be called from any thread.
+    virtual void postIdleTask(const WebTraceLocation&, IdleTask*) { }
+};
+
+} // namespace blink
+
+#endif // WebScheduler_h