cc: Allow SkImage::makeColorSpace to fail

cc/tiles/software_image_decode_cache.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/tiles/software_image_decode_cache.h"
 
 #include <inttypes.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 569 matching lines @@
         base::DiscardableMemoryAllocator::GetInstance()
             ->AllocateLockedDiscardableMemory(decoded_info.minRowBytes() *
                                               decoded_info.height());
   }
   if (target_color_space) {
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
                  "SoftwareImageDecodeCache::GetOriginalSizeImageDecode - "
                  "color conversion");
     image = image->makeColorSpace(target_color_space,
                                   SkTransferFunctionBehavior::kIgnore);
-    DCHECK(image);
+    // Because image is a lazy-decode image, the call to makeColorSpace will
+    // fail if image decode fails.
+    if (!image) {
+      decoded_pixels->Unlock();
+      return nullptr;
+    }
   }
   {
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
                  "SoftwareImageDecodeCache::GetOriginalSizeImageDecode - "
                  "read pixels");
     bool result = image->readPixels(decoded_info, decoded_pixels->data(),
                                     decoded_info.minRowBytes(), 0, 0,
                                     SkImage::kDisallow_CachingHint);
 
     if (!result) {
@@ skipping 580 matching lines @@
     }
   }
 }
 
 void SoftwareImageDecodeCache::OnPurgeMemory() {
   base::AutoLock lock(lock_);
   ReduceCacheUsageUntilWithinLimit(0);
 }
 
 }  // namespace cc