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diff --git a/chromium/net/disk_cache/blockfile/histogram_macros.h b/chromium/net/disk_cache/blockfile/histogram_macros.h
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+// Copyright (c) 2011 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 file contains macros to simplify histogram reporting from the disk
+// cache. The main issue is that we want to have separate histograms for each
+// type of cache (regular vs. media, etc), without adding the complexity of
+// keeping track of a potentially large number of histogram objects that have to
+// survive the backend object that created them.
+
+#ifndef NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_H_
+#define NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_H_
+
+#include "base/metrics/histogram.h"
+
+// -----------------------------------------------------------------------------
+
+// These histograms follow the definition of UMA_HISTOGRAMN_XXX except that
+// the counter is not cached locally.
+
+#define CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) \
+    do { \
+      base::HistogramBase* counter = base::Histogram::FactoryGet( \
+            name, min, max, bucket_count, \
+            base::Histogram::kUmaTargetedHistogramFlag); \
+      counter->Add(sample); \
+    } while (0)
+
+#define CACHE_HISTOGRAM_COUNTS(name, sample) CACHE_HISTOGRAM_CUSTOM_COUNTS( \
+    name, sample, 1, 1000000, 50)
+
+#define CACHE_HISTOGRAM_COUNTS_10000(name, sample) \
+    CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, 1, 10000, 50)
+
+#define CACHE_HISTOGRAM_COUNTS_50000(name, sample) \
+    CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, 1, 50000000, 50)
+
+#define CACHE_HISTOGRAM_CUSTOM_TIMES(name, sample, min, max, bucket_count) \
+    do { \
+      base::HistogramBase* counter = base::Histogram::FactoryTimeGet( \
+            name, min, max, bucket_count, \
+            base::Histogram::kUmaTargetedHistogramFlag); \
+      counter->AddTime(sample); \
+    } while (0)
+
+#define CACHE_HISTOGRAM_TIMES(name, sample) CACHE_HISTOGRAM_CUSTOM_TIMES( \
+    name, sample, base::TimeDelta::FromMilliseconds(1), \
+    base::TimeDelta::FromSeconds(10), 50)
+
+#define CACHE_HISTOGRAM_ENUMERATION(name, sample, boundary_value) do { \
+    base::HistogramBase* counter = base::LinearHistogram::FactoryGet( \
+                    name, 1, boundary_value, boundary_value + 1, \
+                    base::Histogram::kUmaTargetedHistogramFlag); \
+    counter->Add(sample); \
+  } while (0)
+
+#define CACHE_HISTOGRAM_PERCENTAGE(name, under_one_hundred) \
+    CACHE_HISTOGRAM_ENUMERATION(name, under_one_hundred, 101)
+
+// -----------------------------------------------------------------------------
+
+// HISTOGRAM_HOURS will collect time related data with a granularity of hours
+// and normal values of a few months.
+#define CACHE_HISTOGRAM_HOURS CACHE_HISTOGRAM_COUNTS_10000
+
+// HISTOGRAM_AGE will collect time elapsed since |initial_time|, with a
+// granularity of hours and normal values of a few months.
+#define CACHE_HISTOGRAM_AGE(name, initial_time) \
+    CACHE_HISTOGRAM_COUNTS_10000(name, \
+                                 (base::Time::Now() - initial_time).InHours())
+
+// HISTOGRAM_AGE_MS will collect time elapsed since |initial_time|, with the
+// normal resolution of the UMA_HISTOGRAM_TIMES.
+#define CACHE_HISTOGRAM_AGE_MS(name, initial_time)\
+    CACHE_HISTOGRAM_TIMES(name, base::TimeTicks::Now() - initial_time)
+
+#define CACHE_HISTOGRAM_CACHE_ERROR(name, sample) \
+    CACHE_HISTOGRAM_ENUMERATION(name, sample, 50)
+
+// Generates a UMA histogram of the given type, generating the proper name for
+// it (asking backend_->HistogramName), and adding the provided sample.
+// For example, to generate a regualar UMA_HISTOGRAM_COUNTS, this macro would
+// be used as:
+//  CACHE_UMA(COUNTS, "MyName", 0, 20);
+//  CACHE_UMA(COUNTS, "MyExperiment", 530, 55);
+// which roughly translates to:
+//  UMA_HISTOGRAM_COUNTS("DiskCache.2.MyName", 20);  // "2" is the CacheType.
+//  UMA_HISTOGRAM_COUNTS("DiskCache.2.MyExperiment_530", 55);
+//
+#define CACHE_UMA(type, name, experiment, sample) {\
+    const std::string my_name =\
+        CACHE_UMA_BACKEND_IMPL_OBJ->HistogramName(name, experiment);\
+    switch (CACHE_UMA_BACKEND_IMPL_OBJ->cache_type()) {\
+      default:\
+        NOTREACHED();\
+        /* Fall-through. */\
+      case net::DISK_CACHE:\
+      case net::MEDIA_CACHE:\
+      case net::APP_CACHE:\
+      case net::SHADER_CACHE:\
+      case net::PNACL_CACHE:\
+        CACHE_HISTOGRAM_##type(my_name.data(), sample);\
+        break;\
+    }\
+  }
+
+#endif  // NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_H_