Introduce WebTaskRunner Patch 1/5

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 "WebCommon.h"
+#include "public/platform/WebTaskRunner.h"
 #include "public/platform/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 BLINK_PLATFORM_EXPORT WebScheduler {
 public:
@@ skipping 34 matching lines @@
     // Like postIdleTask but does not run the idle task until after some other
     // task has run. This enables posting of a task which won't stop the Blink
     // main thread from sleeping, but will start running after it wakes up.
     // Takes ownership of |IdleTask|. Can be called from any thread.
     virtual void postIdleTaskAfterWakeup(const WebTraceLocation&, WebThread::IdleTask*) { }
 
     // Schedule a loading task to be run on the the associated WebThread. Loading
     // tasks usually have the default priority, but may be deprioritised
     // when the user is interacting with the device.
     // Takes ownership of |WebThread::Task|. Can be called from any thread.
+    // TODO(alexclarke): Remove this in favour of loadingTaskRunner().
     virtual void postLoadingTask(const WebTraceLocation&, WebThread::Task*) { }
 
     // Schedule a timer task to be run on the the associated WebThread. Timer Tasks
     // tasks usually have the default priority, but may be delayed
     // when the user is interacting with the device.
     // Takes ownership of |WebThread::Task|. Can be called from any thread.
+    // TODO(alexclarke): Remove this in favour of timerTaskRunner().
     virtual void postTimerTask(const WebTraceLocation&, WebThread::Task*, long long delayMs) {}
 
     // Schedule a timer task to be run on the the associated WebThread. Timer Tasks
     // tasks usually have the default priority, but may be delayed
     // when the user is interacting with the device.
     // |monotonicTime| is in the timebase of WTF::monotonicallyIncreasingTime().
     // Takes ownership of |WebThread::Task|. Can be called from any thread.
     virtual void postTimerTaskAt(const WebTraceLocation&, WebThread::Task*, double monotonicTime) {}
 
+    // Returns a WebTaskRunner for loading tasks. Can be called from any thread.
+    virtual WebTaskRunner* loadingTaskRunner() { return nullptr; }
+
+    // Returns a WebTaskRunner for timer tasks. Can be called from any thread.
+    virtual WebTaskRunner* timerTaskRunner() { return nullptr; }
+
     // Suspends the timer queue and increments the timer queue suspension count.
     // May only be called from the main thread.
     virtual void suspendTimerQueue() { }
 
     // Decrements the timer queue suspension count and re-enables the timer queue
     // if the suspension count is zero and the current scheduler policy allows it.
     virtual void resumeTimerQueue() { }
 
 #ifdef INSIDE_BLINK
     // Helpers for posting bound functions as tasks.
     typedef Function<void(double deadlineSeconds)> IdleTask;
     typedef Function<void()> Task;
 
     void postIdleTask(const WebTraceLocation&, PassOwnPtr<IdleTask>);
     void postNonNestableIdleTask(const WebTraceLocation&, PassOwnPtr<IdleTask>);
     void postIdleTaskAfterWakeup(const WebTraceLocation&, PassOwnPtr<IdleTask>);
     void postLoadingTask(const WebTraceLocation&, PassOwnPtr<Task>);
     void postTimerTask(const WebTraceLocation&, PassOwnPtr<Task>, long long delayMs);
 #endif
 };
 
 } // namespace blink
 
 #endif // WebScheduler_h