cc: Unify use of DidSwapBuffers() and did_request_swap

cc/scheduler/draw_swap_readback_result.h

-// Copyright 2014 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_SCHEDULER_DRAW_SWAP_READBACK_RESULT_H_
-#define CC_SCHEDULER_DRAW_SWAP_READBACK_RESULT_H_
-
-namespace cc {
-
-struct DrawSwapReadbackResult {
-  enum DrawResult {
-    INVALID_RESULT,
-    DRAW_SUCCESS,
-    DRAW_ABORTED_CHECKERBOARD_ANIMATIONS,
-    DRAW_ABORTED_MISSING_HIGH_RES_CONTENT,
-    DRAW_ABORTED_CANT_READBACK,
-    DRAW_ABORTED_CONTEXT_LOST,
-    DRAW_ABORTED_CANT_DRAW,
-  };
-
-  DrawSwapReadbackResult()
-      : draw_result(INVALID_RESULT),
-        did_request_swap(false),
-        did_readback(false) {}
-  DrawSwapReadbackResult(DrawResult draw_result,
-                         bool did_request_swap,
-                         bool did_readback)
-      : draw_result(draw_result),
-        did_request_swap(did_request_swap),
-        did_readback(did_readback) {}
-  DrawResult draw_result;
-  bool did_request_swap;
-  bool did_readback;
-};
-
-}  // namespace cc
-
-#endif  // CC_SCHEDULER_DRAW_SWAP_READBACK_RESULT_H_