cc: Unify use of DidSwapBuffers() and did_request_swap

cc/scheduler/draw_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_
+#ifndef CC_SCHEDULER_DRAW_RESULT_H_
+#define CC_SCHEDULER_DRAW_RESULT_H_
 
 namespace cc {
 
-struct DrawSwapReadbackResult {
-  enum DrawResult {
+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_
+#endif  // CC_SCHEDULER_DRAW_RESULT_H_