Expose UseCounter::Feature enum out of blink as WebFeature

third_party/WebKit/Source/platform/Histogram.h

Index: third_party/WebKit/Source/platform/Histogram.h
diff --git a/third_party/WebKit/Source/platform/Histogram.h b/third_party/WebKit/Source/platform/Histogram.h
index 190149eb1ecbe6d2b93984450ab958e476576866..69269b2c6d4058cf979934c511e232cf21ff50e2 100644
--- a/third_party/WebKit/Source/platform/Histogram.h
+++ b/third_party/WebKit/Source/platform/Histogram.h
@@ -10,6 +10,7 @@
 #include "base/metrics/histogram_macros.h"
 #include "platform/PlatformExport.h"
 #include "platform/wtf/CurrentTime.h"
+#include "public/platform/WebFeature.h"
 
 namespace base {
 class HistogramBase;
@@ -25,6 +26,9 @@ class PLATFORM_EXPORT CustomCountHistogram {
                        base::HistogramBase::Sample max,
                        int32_t bucket_count);
   void Count(base::HistogramBase::Sample);
+  void Count(WebFeature feature) {
+    return Count(static_cast<base::HistogramBase::Sample>(feature));

[Rick Byers, 2017/05/25 01:53:24]

This class is intended to be a generic part of the UMA infrastructure, not refer
to any specific histogram enum types.  The call sites are just in
UseCounter.cpp, right?  That code should be responsible for converting values
into "Sample"s.

+  }
 
  protected:
   explicit CustomCountHistogram(base::HistogramBase*);