Add default ctor to SkMask

src/device/xps/SkXPSDevice.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 "SkTypes.h"
 #if defined(SK_BUILD_FOR_WIN32)
 
@@ skipping 1610 matching lines @@
                 &clipIRect,
                 filter,  //just to compute how much to draw.
                 &rasteredMask,
                 SkMask::kComputeBoundsAndRenderImage_CreateMode)) {
 
             SkAutoMaskFreeImage rasteredAmi(rasteredMask.fImage);
             mask = &rasteredMask;
 
             //[Mask -> Mask]
             SkMask filteredMask;
-            if (filter &&
-                filter->filterMask(&filteredMask, *mask, *d.fMatrix, nullptr)) {
-
+            if (filter && filter->filterMask(&filteredMask, *mask, *d.fMatrix, nullptr)) {
                 mask = &filteredMask;
-            } else {
-                filteredMask.fImage = nullptr;
             }
             SkAutoMaskFreeImage filteredAmi(filteredMask.fImage);
 
             //Draw mask.
             HRV(this->applyMask(d, *mask, ppuScale, shadedPath.get()));
         }
         return;
     }
 
     //Mask filter
@@ skipping 21 matching lines @@
                         &matrix,
                         &rasteredMask,
                         SkMask::kComputeBoundsAndRenderImage_CreateMode,
                         paint->getStyle())) {
 
             SkAutoMaskFreeImage rasteredAmi(rasteredMask.fImage);
             mask = &rasteredMask;
 
             //[Mask -> Mask]
             SkMask filteredMask;
-            if (filter->filterMask(&filteredMask,
-                                   rasteredMask,
-                                   matrix,
-                                   nullptr)) {
+            if (filter->filterMask(&filteredMask, rasteredMask, matrix, nullptr)) {
                 mask = &filteredMask;
-            } else {
-                filteredMask.fImage = nullptr;
             }
             SkAutoMaskFreeImage filteredAmi(filteredMask.fImage);
 
             //Draw mask.
             HRV(this->applyMask(d, *mask, ppuScale, shadedPath.get()));
         }
         return;
     }
 
     //Get the figures from the shaded geometry.
@@ skipping 573 matching lines @@
         //SkXPSDevice* dev = new SkXPSDevice(this);
         //SkSize s = SkSize::Make(width, height);
         //dev->BeginCanvas(s, s, SkMatrix::I());
         //return dev;
     }
 #endif
     return new SkXPSDevice(this->fXpsFactory.get());
 }
 
 #endif//defined(SK_BUILD_FOR_WIN32)