A crude cut at incorporating stream 1 footer read into stream 0 read.

net/disk_cache/simple/simple_synchronous_entry.h

Index: net/disk_cache/simple/simple_synchronous_entry.h
diff --git a/net/disk_cache/simple/simple_synchronous_entry.h b/net/disk_cache/simple/simple_synchronous_entry.h
index a7e6e66b12091847ed31623ecdebf1b41d008acc..90d6984c2d5a90847af76ec4438dbef3fe82592e 100644
--- a/net/disk_cache/simple/simple_synchronous_entry.h
+++ b/net/disk_cache/simple/simple_synchronous_entry.h
@@ -380,6 +380,10 @@ class SimpleSynchronousEntry {
   // was created to store it.
   bool empty_file_omitted_[kSimpleEntryFileCount];
 
+  uint32_t stream1_crc32_;
+  bool has_stream1_crc32_;
+  bool read_stream1_crc32_;
+
   typedef std::map<int64_t, SparseRange> SparseRangeOffsetMap;
   typedef SparseRangeOffsetMap::iterator SparseRangeIterator;
   SparseRangeOffsetMap sparse_ranges_;