WebRTC overrides: Add linear histogram type w/ bucket count parameter

third_party/webrtc_overrides/init_webrtc.cc

Index: third_party/webrtc_overrides/init_webrtc.cc
diff --git a/third_party/webrtc_overrides/init_webrtc.cc b/third_party/webrtc_overrides/init_webrtc.cc
index 42a5df2734896f3fedfe96c6987c39660b848623..f51455ec7b71bf0d23eb1ff88deabf8415d35a06 100644
--- a/third_party/webrtc_overrides/init_webrtc.cc
+++ b/third_party/webrtc_overrides/init_webrtc.cc
@@ -51,6 +51,13 @@ Histogram* HistogramFactoryGetCounts(
           base::HistogramBase::kUmaTargetedHistogramFlag));
 }
 
+Histogram* HistogramFactoryGetCountsLinear(
+    const std::string& name, int min, int max, int bucket_count) {
+  return reinterpret_cast<Histogram*>(
+      base::LinearHistogram::FactoryGet(name, min, max, bucket_count,
+          base::HistogramBase::kUmaTargetedHistogramFlag));
+}
+
 Histogram* HistogramFactoryGetEnumeration(
     const std::string& name, int boundary) {
   return reinterpret_cast<Histogram*>(