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

third_party/WebKit/Source/platform/Histogram.cpp

Index: third_party/WebKit/Source/platform/Histogram.cpp
diff --git a/third_party/WebKit/Source/platform/Histogram.cpp b/third_party/WebKit/Source/platform/Histogram.cpp
index cb8711624df40e6ff602f1d2eb34629530ac3fba..48997ee50917e82786bd1fd86eb50eb5f38c042f 100644
--- a/third_party/WebKit/Source/platform/Histogram.cpp
+++ b/third_party/WebKit/Source/platform/Histogram.cpp
@@ -49,4 +49,15 @@ 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