[Offline Pages] Adding missing image/CSS detection in FrameSerializer.

third_party/WebKit/Source/platform/Histogram.h

 // Copyright 2016 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.
 
 #ifndef Histogram_h
 #define Histogram_h
 
 #include <stdint.h>
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 36 matching lines @@
 class PLATFORM_EXPORT SparseHistogram {
  public:
   explicit SparseHistogram(const char* name);
 
   void Sample(base::HistogramBase::Sample);
 
  private:
   base::HistogramBase* histogram_;
 };
 
+class PLATFORM_EXPORT LinearHistogram : public CustomCountHistogram {
+ public:
+  explicit LinearHistogram(const char* name,
+                           base::HistogramBase::Sample min,
+                           base::HistogramBase::Sample max,
+                           int32_t bucket_count);
+};
+
 class PLATFORM_EXPORT ScopedUsHistogramTimer {
  public:
   ScopedUsHistogramTimer(CustomCountHistogram& counter)
       : start_time_(WTF::MonotonicallyIncreasingTime()), counter_(counter) {}
 
   ~ScopedUsHistogramTimer() {
     counter_.Count((WTF::MonotonicallyIncreasingTime() - start_time_) *
                    base::Time::kMicrosecondsPerSecond);
   }
 
@@ skipping 13 matching lines @@
 // This macro records all times between 0us and 10 seconds.
 // Do not change this macro without renaming all metrics that use it!
 #define SCOPED_BLINK_UMA_HISTOGRAM_TIMER(name)                 \
   DEFINE_STATIC_LOCAL(CustomCountHistogram, scoped_us_counter, \
                       (name, 0, 10000000, 50));                \
   ScopedUsHistogramTimer timer(scoped_us_counter);
 
 }  // namespace blink
 
 #endif  // Histogram_h