Added CacheEntry implementation.

net/disk_cache/flash/format.h

Index: net/disk_cache/flash/format.h
diff --git a/net/disk_cache/flash/format.h b/net/disk_cache/flash/format.h
index d32344d92fac169993129a387fd0bb5eac67b646..660c614f033fd677b5c9f696356cefa5374be91c 100644
--- a/net/disk_cache/flash/format.h
+++ b/net/disk_cache/flash/format.h
@@ -22,6 +22,11 @@ const size_t kFlashMaxEntryCount = kFlashSegmentSize / kFlashSmallEntrySize - 1;
 const int32 kFlashSummarySize = (1 + kFlashMaxEntryCount) * sizeof(int32);
 const int32 kFlashSegmentFreeSpace = kFlashSegmentSize - kFlashSummarySize;
 
+// An entry consists of a fixed number of streams.
+const int32 kFlashCacheEntryNumStreams = 4;
+const int32 kFlashCacheEntryHeaderSize =
+    kFlashCacheEntryNumStreams * sizeof(int32);
+
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_FLASH_FORMAT_H_