Add histograms to compare GetVersionEx() with VerQueryValue() of kernel32

base/win/windows_version.h

Index: base/win/windows_version.h
diff --git a/base/win/windows_version.h b/base/win/windows_version.h
index 676bd979578b9fc07b83bed55d6d5257650858c8..86f93bb5183616f9fa2cf499e5f46a4ae3333ebf 100644
--- a/base/win/windows_version.h
+++ b/base/win/windows_version.h
@@ -86,6 +86,7 @@ class BASE_EXPORT OSInfo {
   static OSInfo* GetInstance();
 
   Version version() const { return version_; }
+  Version kernel32_version() const { return kernel32_version_; }

[Will Harris, 2016/03/09 23:02:50]

how are none of these functions commented...? :)

[scottmg, 2016/03/10 00:41:31]

Doesn't seem like comments would be very useful.

   // The next two functions return arrays of values, [major, minor(, build)].
   VersionNumber version_number() const { return version_number_; }
   VersionType version_type() const { return version_type_; }
@@ -105,6 +106,7 @@ class BASE_EXPORT OSInfo {
   ~OSInfo();
 
   Version version_;
+  Version kernel32_version_;
   VersionNumber version_number_;
   VersionType version_type_;
   ServicePack service_pack_;