Disk Cache: Add more corruption tracking histograms.

net/disk_cache/addr.h

-// 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.
 
 // This is an internal class that handles the address of a cache record.
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
 #ifndef NET_DISK_CACHE_ADDR_H_
 #define NET_DISK_CACHE_ADDR_H_
 #pragma once
 
@@ skipping 75 matching lines @@
       return ((value_ & kFileSelectorMask) >> kFileSelectorOffset);
   }
 
   int start_block() const;
   int num_blocks() const;
   bool SetFileNumber(int file_number);
   int BlockSize() const {
     return BlockSizeForFileType(file_type());
   }
 
+  bool operator==(Addr other) const {
+    return value_ == other.value_;
+  }
+
+  bool operator!=(Addr other) const {
+    return value_ != other.value_;
+  }
+
   static int BlockSizeForFileType(FileType file_type) {
     switch (file_type) {
       case RANKINGS:
         return 36;
       case BLOCK_256:
         return 256;
       case BLOCK_1K:
         return 1024;
       case BLOCK_4K:
         return 4096;
       default:
         return 0;
     }
   }
 
   static FileType RequiredFileType(int size) {
     if (size < 1024)
       return BLOCK_256;
     else if (size < 4096)
       return BLOCK_1K;
     else if (size <= 4096 * 4)
       return BLOCK_4K;
     else
       return EXTERNAL;
   }
 
   // Returns true if this address looks like a valid one.
   bool SanityCheck() const;
+  bool SanityCheckForEntry() const;
+  bool SanityCheckForRankings() const;
 
  private:
   static const uint32 kInitializedMask    = 0x80000000;
   static const uint32 kFileTypeMask       = 0x70000000;
   static const uint32 kFileTypeOffset     = 28;
   static const uint32 kNumBlocksMask      = 0x03000000;
   static const uint32 kNumBlocksOffset    = 24;
   static const uint32 kFileSelectorMask   = 0x00ff0000;
   static const uint32 kFileSelectorOffset = 16;
   static const uint32 kStartBlockMask     = 0x0000FFFF;
   static const uint32 kFileNameMask       = 0x0FFFFFFF;
 
   CacheAddr value_;
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_ADDR_H_