cc: Simplify task and its derived classes.

cc/raster/zero_copy_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/zero_copy_tile_task_worker_pool.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/debug/traced_value.h"
-#include "cc/raster/raster_buffer.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/resource.h"
 #include "ui/gfx/buffer_format_util.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace cc {
 namespace {
 
 class RasterBufferImpl : public RasterBuffer {
  public:
@@ skipping 70 matching lines @@
   TRACE_EVENT0("cc", "ZeroCopyTileTaskWorkerPool::Shutdown");
 
   TaskGraph empty;
   task_graph_runner_->ScheduleTasks(namespace_token_, &empty);
   task_graph_runner_->WaitForTasksToFinishRunning(namespace_token_);
 }
 
 void ZeroCopyTileTaskWorkerPool::ScheduleTasks(TaskGraph* graph) {
   TRACE_EVENT0("cc", "ZeroCopyTileTaskWorkerPool::ScheduleTasks");
 
-  ScheduleTasksOnOriginThread(this, graph);
+  ScheduleTasksOnOriginThread(graph);
   task_graph_runner_->ScheduleTasks(namespace_token_, graph);
 }
 
 void ZeroCopyTileTaskWorkerPool::CheckForCompletedTasks() {
   TRACE_EVENT0("cc", "ZeroCopyTileTaskWorkerPool::CheckForCompletedTasks");
 
   task_graph_runner_->CollectCompletedTasks(namespace_token_,
                                             &completed_tasks_);
   for (Task::Vector::const_iterator it = completed_tasks_.begin();
        it != completed_tasks_.end(); ++it) {
-    TileTask* task = static_cast<TileTask*>(it->get());
+    Task* task = it->get();
 
     task->WillComplete();
-    task->CompleteOnOriginThread(this);
+    task->CompleteOnOriginThread();
     task->DidComplete();
   }
   completed_tasks_.clear();
 }
 
 ResourceFormat ZeroCopyTileTaskWorkerPool::GetResourceFormat(
     bool must_support_alpha) const {
   if (resource_provider_->IsResourceFormatSupported(preferred_tile_format_) &&
       (DoesResourceFormatSupportAlpha(preferred_tile_format_) ||
        !must_support_alpha)) {
@@ skipping 15 matching lines @@
   return make_scoped_ptr<RasterBuffer>(
       new RasterBufferImpl(resource_provider_, resource));
 }
 
 void ZeroCopyTileTaskWorkerPool::ReleaseBufferForRaster(
     scoped_ptr<RasterBuffer> buffer) {
   // Nothing to do here. RasterBufferImpl destructor cleans up after itself.
 }
 
 }  // namespace cc