Disk Cache: Add more corruption tracking histograms.

net/disk_cache/addr.cc

Index: net/disk_cache/addr.cc
===================================================================
--- net/disk_cache/addr.cc	(revision 133063)
+++ net/disk_cache/addr.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -40,4 +40,24 @@
   return !(value_ & kReservedBitsMask);
 }
 
+bool Addr::SanityCheckForEntry() const {
+  if (!SanityCheck() || !is_initialized())
+    return false;
+
+  if (is_separate_file() || file_type() != BLOCK_256)
+    return false;
+
+  return true;
+}
+
+bool Addr::SanityCheckForRankings() const {
+  if (!SanityCheck() || !is_initialized())
+    return false;
+
+  if (is_separate_file() || file_type() != RANKINGS || num_blocks() != 1)
+    return false;
+
+  return true;
+}
+
 }  // namespace disk_cache