tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 32499f100af6094c24c9572bf9348c0e9067dd43..0f22ea974ef2d5e2d1c7fe52cfb45fbed94b1d9f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -32066,6 +32066,15 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="WebFont.PackageFormat" enum="WebFontPackageFormat">
+  <owner>kenjibaheux@chromium.org</owner>
+  <owner>ksakamoto@chromium.org</owner>
+  <summary>
+    The packaging format of the font file (e.g. SFNT, WOFF ...) upon a webfont
+    load.
+  </summary>
+</histogram>
+
 <histogram name="WebFont.Resource.StyleRecalcToDownloadLatency"
     units="milliseconds">
   <owner>kenjibaheux@chromium.org</owner>
@@ -44899,6 +44908,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="2" label="Previously in the cache"/>
 </enum>
 
+<enum name="WebFontPackageFormat" type="int">
+  <int value="0" label="SFNT"/>
+  <int value="1" label="WOFF"/>
+  <int value="2" label="WOFF 2.0"/>
+  <int value="3" label="SVG"/>
+  <int value="4" label="Unknown / Decode error"/>

[Ilya Sherman, 2014/06/11 20:01:31]

If your Blink CL hasn't landed yet, I'd recommend making this the first bucket. 
That way, if you ever add any additional formats, "UNKNOWN" won't end up
somewhere in the middle of the list.

[Kunihiko Sakamoto, 2014/06/12 01:44:26]

Aha, thank you for the suggestion! Done.

+</enum>
+
 <enum name="WebFontUsageType" type="int">
   <int value="0" label="Styled, and used"/>
   <int value="1" label="Styled, but not used"/>