Use filter context to track stats better in SDCH filtering

net/base/sdch_manager.h

 // Copyright (c) 2006-2008 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.
 
 // Provides global database of differential decompression dictionaries for the
 // SDCH filter (processes sdch enconded content).
 
 // Exactly one instance of SdchManager is built, and all references are made
 // into that collection.
 //
@@ skipping 101 matching lines @@
     DOMAIN_BLACKLIST_INCLUDES_TARGET = 61,
 
     // Problematic decode recovery methods.
     META_REFRESH_RECOVERY = 70,            // Dictionary not found.
     // defunct =  71, // Almost the same as META_REFRESH_UNSUPPORTED.
     // defunct = 72,  // Almost the same as CACHED_META_REFRESH_UNSUPPORTED.
     // defunct = 73,  // PASSING_THROUGH_NON_SDCH plus DISCARD_TENTATIVE_SDCH.
     META_REFRESH_UNSUPPORTED = 74,         // Unrecoverable error.
     CACHED_META_REFRESH_UNSUPPORTED = 75,  // As above, but pulled from cache.
     PASSING_THROUGH_NON_SDCH = 76,  // Non-html tagged as sdch but malformed.
-    INCOMPLETE_SDCH_CONTENT = 77,  // Last window was not completely decoded.
+    INCOMPLETE_SDCH_CONTENT = 77,   // Last window was not completely decoded.
 
 
     // Common decoded recovery methods.
     META_REFRESH_CACHED_RECOVERY = 80,  // Probably startup tab loading.
     DISCARD_TENTATIVE_SDCH = 81,        // Server decided not to use sdch.
 
     // Non SDCH problems, only accounted for to make stat counting complete
     // (i.e., be able to be sure all dictionary advertisements are accounted
     // for).
 
-    UNFLUSHED_CONTENT = 90,  // Possible error in filter chaining.
+    UNFLUSHED_CONTENT = 90,   // Possible error in filter chaining.
     MISSING_TIME_STATS = 91,  // Should never happen.
-    CACHE_DECODED = 92,  // Hence there are no timing stats recorded.
+    CACHE_DECODED = 92,       // No timing stats recorded.
+    OVER_10_MINUTES = 93,     // No timing stats will be recorded.
+    UNINITIALIZED = 94,       // Filter never even got initialized.
+    PRIOR_TO_DICTIONARY = 95, // We hadn't even parsed a dictionary selector.
+    DECODE_ERROR = 96,        // Something went wrong during decode.
 
     MAX_PROBLEM_CODE  // Used to bound histogram.
   };
 
   // Use the following static limits to block DOS attacks until we implement
   // a cached dictionary evicition strategy.
   static const size_t kMaxDictionarySize;
   static const size_t kMaxDictionaryCount;
 
   // There is one instance of |Dictionary| for each memory-cached SDCH
@@ skipping 180 matching lines @@
   DomainCounter blacklisted_domains_;
 
   // Support exponential backoff in number of domain accesses before
   // blacklisting expires.
   DomainCounter exponential_blacklist_count;
 
   DISALLOW_COPY_AND_ASSIGN(SdchManager);
 };
 
 #endif  // NET_BASE_SDCH_MANAGER_H_