cc: Make images that can't possibly fit in cache not checker.

cc/tiles/software_image_decode_cache.cc

Index: cc/tiles/software_image_decode_cache.cc
diff --git a/cc/tiles/software_image_decode_cache.cc b/cc/tiles/software_image_decode_cache.cc
index 716d1f45ef3d1df3b5b6ca2034301acae0201c39..390974f976888baf47ecb3f20f59d5738e7419bc 100644
--- a/cc/tiles/software_image_decode_cache.cc
+++ b/cc/tiles/software_image_decode_cache.cc
@@ -839,6 +839,10 @@ void SoftwareImageDecodeCache::ClearCache() {
   ReduceCacheUsageUntilWithinLimit(0);
 }
 
+size_t SoftwareImageDecodeCache::GetMaximumMemoryLimit() const {
+  return locked_images_budget_.total_limit_bytes();
+}
+
 void SoftwareImageDecodeCache::RemovePendingTask(const ImageKey& key,
                                                  DecodeTaskType task_type) {
   base::AutoLock lock(lock_);