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

third_party/WebKit/Source/platform/Histogram.cpp

 // 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.
 
 #include "platform/Histogram.h"
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 
 namespace blink {
@@ skipping 31 matching lines @@
 
 SparseHistogram::SparseHistogram(const char* name) {
   histogram_ = base::SparseHistogram::FactoryGet(
       name, base::HistogramBase::kUmaTargetedHistogramFlag);
 }
 
 void SparseHistogram::Sample(base::HistogramBase::Sample sample) {
   histogram_->Add(sample);
 }
 
+LinearHistogram::LinearHistogram(const char* name,
+                                 base::HistogramBase::Sample min,
+                                 base::HistogramBase::Sample max,
+                                 int32_t bucket_count)
+    : CustomCountHistogram(base::LinearHistogram::FactoryGet(
+          name,
+          min,
+          max,
+          bucket_count,
+          base::HistogramBase::kUmaTargetedHistogramFlag)) {}
+
 }  // namespace blink