cc: Simplify task and its derived classes.

cc/raster/tile_task_worker_pool.cc

 // Copyright 2013 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.
 
 #include "cc/raster/tile_task_worker_pool.h"
 
 #include <stddef.h>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/playback/raster_source.h"
 #include "cc/raster/texture_compressor.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
 namespace cc {
 
 TileTaskWorkerPool::TileTaskWorkerPool() {}
 
 TileTaskWorkerPool::~TileTaskWorkerPool() {}
 
 // static
-void TileTaskWorkerPool::ScheduleTasksOnOriginThread(TileTaskClient* client,
-                                                     TaskGraph* graph) {
+void TileTaskWorkerPool::ScheduleTasksOnOriginThread(TaskGraph* graph) {
   TRACE_EVENT0("cc", "TileTaskWorkerPool::ScheduleTasksOnOriginThread");
 
   for (TaskGraph::Node::Vector::iterator it = graph->nodes.begin();
        it != graph->nodes.end(); ++it) {
     TaskGraph::Node& node = *it;
-    TileTask* task = static_cast<TileTask*>(node.task);
+    Task* task = node.task;
 
     if (!task->HasBeenScheduled()) {
       task->WillSchedule();
-      task->ScheduleOnOriginThread(client);
+      task->ScheduleOnOriginThread();
       task->DidSchedule();
     }
   }
 }
 
 namespace {
 
 bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
   switch (format) {
     case RGBA_4444:
@@ skipping 94 matching lines @@
     case RED_8:
     case LUMINANCE_F16:
       NOTREACHED();
       return;
   }
 
   NOTREACHED();
 }
 
 }  // namespace cc