Add SkColorSpace to SkImageInfo

src/core/SkMipMap.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMipMap.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 388 matching lines @@
         if (nullptr == dm) {
             return nullptr;
         }
         mipmap = new SkMipMap(storageSize, dm);
     } else {
         mipmap = new SkMipMap(sk_malloc_throw(storageSize), storageSize);
     }
 
     // init
     mipmap->fCount = countLevels;
+    memset(mipmap->writable_data(), 0, mipmap->size());

[msarett, 2016/05/26 13:43:05]

Not sure if this ok...  I can also make it more fine-grained.

If we interpret garbage memory as an SkImageInfo, and then try to unref its
sk_sp, bad things happen...

     mipmap->fLevels = (Level*)mipmap->writable_data();
 
     Level* levels = mipmap->fLevels;
     uint8_t*    baseAddr = (uint8_t*)&levels[countLevels];
     uint8_t*    addr = baseAddr;
     int         width = src.width();
     int         height = src.height();
     uint32_t    rowBytes;
     SkPixmap    srcPM(src);
 
@@ skipping 161 matching lines @@
         return false;
     }
     if (index > fCount - 1) {
         return false;
     }
     if (levelPtr) {
         *levelPtr = fLevels[index];
     }
     return true;
 }