guarded change to SkImageGenerator to make getInfo() const

tools/LazyDecodeBitmap.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 "LazyDecodeBitmap.h"
 
 #include "SkData.h"
 #include "SkDiscardableMemoryPool.h"
 #include "SkImageGeneratorPriv.h"
 #include "SkForceLinking.h"
 
 #include "SkCommandLineFlags.h"
 
 __SK_FORCE_IMAGE_DECODER_LINKING;
 
 DEFINE_bool(useVolatileCache, false, "Use a volatile cache for deferred image decoding pixels. "
             "Only meaningful if --deferImageDecoding is set to true and the platform has an "
             "implementation.");
 
 //  Fits SkPicture::InstallPixelRefProc call signature.
 //  Used in SkPictureData::CreateFromStream
-bool sk_tools::LazyDecodeBitmap(const void* src,
-                                size_t length,
-                                SkBitmap* dst) {
+bool sk_tools::LazyDecodeBitmap(const void* src, size_t length, SkBitmap* dst) {
     SkAutoDataUnref data(SkData::NewWithCopy(src, length));
     if (NULL == data.get()) {
         return false;
     }
 
     SkAutoTDelete<SkImageGenerator> gen(SkImageGenerator::NewFromData(data));
-    SkImageInfo info;
-    if ((NULL == gen.get()) || !gen->getInfo(&info)) {
+    if (NULL == gen.get()) {
         return false;
     }
+    const SkImageInfo info = gen->getInfo();
     SkDiscardableMemory::Factory* pool = NULL;
     if ((!FLAGS_useVolatileCache) || (info.width() * info.height() < 32 * 1024)) {
         // how to do switching with SkDiscardableMemory.
         pool = SkGetGlobalDiscardableMemoryPool();
         // Only meaningful if platform has a default discardable
         // memory implementation that differs from the global DM pool.
     }
     return SkInstallDiscardablePixelRef(gen.detach(), dst, pool);
 }