guarded change to SkImageGenerator to make getInfo() const

src/lazy/SkCachingPixelRef.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 "SkCachingPixelRef.h"
 #include "SkBitmapCache.h"
 #include "SkRect.h"
 
 bool SkCachingPixelRef::Install(SkImageGenerator* generator,
                                 SkBitmap* dst) {
-    SkImageInfo info;
     SkASSERT(dst != NULL);
-    if ((NULL == generator)
-        || !(generator->getInfo(&info))
-        || !dst->setInfo(info)) {
+    if (NULL == generator) {
+        return false;
+    }
+    const SkImageInfo info = generator->getInfo();
+    if (!dst->setInfo(info)) {
         SkDELETE(generator);
         return false;
     }
     SkAutoTUnref<SkCachingPixelRef> ref(SkNEW_ARGS(SkCachingPixelRef,
                                            (info, generator, dst->rowBytes())));
     dst->setPixelRef(ref);
     return true;
 }
 
 SkCachingPixelRef::SkCachingPixelRef(const SkImageInfo& info,
@@ skipping 42 matching lines @@
     SkASSERT(pixels != NULL);
     rec->fPixels = pixels;
     rec->fColorTable = NULL;
     rec->fRowBytes = fLockedBitmap.rowBytes();
     return true;
 }
 
 void SkCachingPixelRef::onUnlockPixels() {
     fLockedBitmap.reset();
 }