[scheduler] Change TaskQueue observer call mechanism.

third_party/WebKit/Source/platform/scheduler/base/task_queue.h

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue.h
index 64c39a6fe75ee22db3736dd16b9a35092f921b45..8ac280a0fe3aaf8a61290c1bec3a0361878d767c 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue.h
@@ -37,6 +37,9 @@ class PLATFORM_EXPORT TaskQueue : public base::SingleThreadTaskRunner {
     // Can be called on any thread
     // All methods but SetObserver, SetTimeDomain and GetTimeDomain can be
     // called on |queue|.
+    //
+    // TODO(altimin): Make it base::Optional<base::TimeTicks> to tell

[alex clarke (OOO till 29th), 2017/05/09 12:50:50]

Probably a discussion for the follow on patch but I'd appreciate it if we can
have a quick whiteboard session before changing this API.  I think that'll make
things much soother.

[altimin, 2017/05/09 13:15:03]

Acknowledged.

+    // observer about cancellations.
     virtual void OnQueueNextWakeUpChanged(TaskQueue* queue,
                                           base::TimeTicks next_wake_up) = 0;
   };
@@ -162,7 +165,7 @@ class PLATFORM_EXPORT TaskQueue : public base::SingleThreadTaskRunner {
 
   // Returns true if the queue has work that's ready to execute now.
   // NOTE: this must be called on the thread this TaskQueue was created by.
-  virtual bool HasPendingImmediateWork() const = 0;
+  virtual bool HasTaskToRunImmediately() const = 0;
 
   // Returns requested run time of next scheduled wake-up for a delayed task
   // which is not ready to run. If there are no such tasks or the queue is