Chromium side of adding postLoading task to the blink scheduler.

BUG=391005

Review URL: https://codereview.chromium.org/854053003

Cr-Commit-Position: refs/heads/master@{#313087}

content/renderer/scheduler/web_scheduler_impl.cc

@@ -28,6 +28,10 @@ void WebSchedulerImpl::runIdleTask(
   task->run((deadline - base::TimeTicks()).InSecondsF());
 }
 
+void WebSchedulerImpl::runTask(scoped_ptr<blink::WebThread::Task> task) {
+  task->run();
+}
+
 void WebSchedulerImpl::postIdleTask(const blink::WebTraceLocation& web_location,
                                     blink::WebScheduler::IdleTask* task) {
   scoped_ptr<blink::WebScheduler::IdleTask> scoped_task(task);
@@ -38,6 +42,16 @@ void WebSchedulerImpl::postIdleTask(const blink::WebTraceLocation& web_location,
       base::Bind(&WebSchedulerImpl::runIdleTask, base::Passed(&scoped_task)));
 }
 
+void WebSchedulerImpl::postLoadingTask(
+    const blink::WebTraceLocation& web_location, blink::WebThread::Task* task) {
+  scoped_ptr<blink::WebThread::Task> scoped_task(task);
+  tracked_objects::Location location(web_location.functionName(),
+                                     web_location.fileName(), -1, nullptr);
+  renderer_scheduler_->LoadingTaskRunner()->PostTask(
+      location,
+      base::Bind(&WebSchedulerImpl::runTask, base::Passed(&scoped_task)));
+}
+
 void WebSchedulerImpl::shutdown() {
   return renderer_scheduler_->Shutdown();
 }

content/renderer/scheduler/web_scheduler_impl.h

@@ -9,6 +9,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "third_party/WebKit/public/platform/WebScheduler.h"
+#include "third_party/WebKit/public/platform/WebThread.h"
 
 namespace content {
 
@@ -23,11 +24,14 @@ class WebSchedulerImpl : public blink::WebScheduler {
   virtual bool shouldYieldForHighPriorityWork();
   virtual void postIdleTask(const blink::WebTraceLocation& location,
                             blink::WebScheduler::IdleTask* task);
+  virtual void postLoadingTask(const blink::WebTraceLocation& location,
+                               blink::WebThread::Task* task);
   virtual void shutdown();
 
  private:
   static void runIdleTask(scoped_ptr<blink::WebScheduler::IdleTask> task,
                           base::TimeTicks deadline);
+  static void runTask(scoped_ptr<blink::WebThread::Task> task);
 
   RendererScheduler* renderer_scheduler_;
   scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;