add SkCanvas constructor that explicitly creates no_config with dimensions

src/utils/SkNWayCanvas.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkNWayCanvas.h"
 
-static SkBitmap make_noconfig_bm(int width, int height) {
-    SkBitmap bm;
-    bm.setConfig(SkBitmap::kNo_Config, width, height);
-    return bm;
-}
-
 SkNWayCanvas::SkNWayCanvas(int width, int height)
-        : INHERITED(make_noconfig_bm(width, height)) {}
+        : INHERITED(width, height) {}
 
 SkNWayCanvas::~SkNWayCanvas() {
     this->removeAll();
 }
 
 void SkNWayCanvas::addCanvas(SkCanvas* canvas) {
     if (canvas) {
         canvas->ref();
         *fList.append() = canvas;
     }
@@ skipping 320 matching lines @@
         iter->addComment(kywd, value);
     }
 }
 
 void SkNWayCanvas::endCommentGroup() {
     Iter iter(fList);
     while (iter.next()) {
         iter->endCommentGroup();
     }
 }