**WIP** Simple Cache: reduce seeks on 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..71c0644f058ad35777dd83fd5c6d186f5422b73e 100644
--- a/net/disk_cache/simple/simple_synchronous_entry.h
+++ b/net/disk_cache/simple/simple_synchronous_entry.h
@@ -81,6 +81,7 @@ struct SimpleEntryCreationResults {
   scoped_refptr<net::GrowableIOBuffer> stream_0_data;
   SimpleEntryStat entry_stat;
   uint32_t stream_0_crc32;
+  uint32_t stream_1_crc32;
   int result;
 };
 
@@ -279,6 +280,11 @@ class SimpleSynchronousEntry {
   // this header. Records histograms if any check is failed.
   bool CheckHeaderAndKey(int file_index);
 
+  // Read the 
+  bool ReadStream0Data(SimpleEntryStat* out_entry_stat,
+                       scoped_refptr<net::GrowableIOBuffer>* stream_0_data,
+                       uint32_t* out_stream_0_crc32);
+
   // Returns a net error, i.e. net::OK on success.
   int InitializeForOpen(SimpleEntryStat* out_entry_stat,
                         scoped_refptr<net::GrowableIOBuffer>* stream_0_data,