Open-source the "SSL.InsecureContent" histogram

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 80a3e479a090e5108dce1a5ca9bdc5226aa38e45..b821e7f0d6e52e7d76f2539eab4ba3f734581591 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -33088,6 +33088,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <summary>Error codes returned by sqlite the web db.</summary>
 </histogram>
 
+<histogram name="SSL.InsecureContent" enum="InsecureContentType">
+  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <summary>
+    Keeps track of various insecure content events, such as loading http script
+    from an https page.
+  </summary>
+</histogram>
+
 <histogram name="Stars.Goog_Related" units="percent">
   <owner>yefim@chromium.org</owner>
   <summary>
@@ -44567,6 +44575,33 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="611700" label="ur-t-i0-und">Transliteration Urdu</int>
 </enum>
 
+<enum name="InsecureContentType" type="int">
+  <int value="0" label="Displayed"/>
+  <int value="1" label="Displayed by *.google.com"/>
+  <int value="2" label="Displayed by www.google.com"/>
+  <int value="3" label="Displayed due to an iframe"/>
+  <int value="4" label="Ran"/>
+  <int value="5" label="Ran by *.google.com"/>
+  <int value="6" label="Ran by www.google.com"/>
+  <int value="7" label="Ran from www.youtube.com"/>
+  <int value="8" label="Ran due to script"/>
+  <int value="9" label="Ran due to CSS"/>
+  <int value="10" label="Ran due to a plug-in"/>
+  <int value="11" label="Displayed by www.youtube.com"/>
+  <int value="12" label="Ran by www.youtube.com"/>
+  <int value="13" label="Ran by *.googleusercontent.com"/>
+  <int value="14" label="Displayed by mail.google.com"/>
+  <int value="15" label="Ran by mail.google.com"/>
+  <int value="16" label="Displayed by plus.google.com"/>
+  <int value="17" label="Ran by plus.google.com"/>
+  <int value="18" label="Displayed by docs.google.com"/>
+  <int value="19" label="Ran by docs.google.com"/>
+  <int value="20" label="Displayed by sites.google.com"/>
+  <int value="21" label="Ran by sites.google.com"/>
+  <int value="22" label="Displayed by picasaweb.google.com"/>
+  <int value="23" label="Ran by picasaweb.google.com"/>
+</enum>
+
 <enum name="InstantControllerEvent" type="int">
   <int value="0" label="URL_ADDED_TO_BLACKLIST"/>
   <int value="1" label="URL_REMOVED_FROM_BLACKLIST"/>