cc: Simplify Task and its derived classes.

cc/raster/task_types.h

+// Copyright 2016 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 CC_RASTER_TASK_TYPES_H_
+#define CC_RASTER_TASK_TYPES_H_
+
+#include <stdint.h>
+
+namespace cc {
+
+// Task requiring specific handling (e.g. processing completed task in
+// different manner) needs to be declared here. With TaskType they can be
+// differenciated. Task not specifying the TaskType gets created with
+// TASK_TYPE_DEFAULT.
+enum TaskType : uint32_t {
+  TASK_TYPE_DEFAULT,
+  TASK_TYPE_RASTER,
+  TASK_TYPE_IMAGE_DECODE,
+  TASK_TYPE_IMAGE_UPLOAD
+};

[reveman, 2016/04/16 10:10:28]

can we move this into tile_manager.cc or tile_manager.h?

+
+}  // namespace cc
+
+#endif  // CC_RASTER_TASK_TYPES_H_