Collecting statistics on iframe permissions use.

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 36452aa5c26c270e116b87468e7b6d6c86212d23..75136058ef5f58b9fbccd4fe8d96696c41775c0c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -3912,6 +3912,27 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Number of times a given permission was requested.</summary>
 </histogram>
 
+<histogram name="ContentSettings.PermissionRequested.OffOrigin"

[mlamouri (slow - plz ping), 2015/06/29 14:23:08]

nit: s/OffOrigin/CrossOrigin/ ?

[keenanb, 2015/06/29 19:09:00]

i actually agree with  you, but "OffOrigin" is common in histograms.xml,
whereas "CrossOrigin" is not used.

+    enum="ContentSetting">
+  <owner>keenanb@google.com</owner>
+  <owner>jww@chromium.org</owner>
+  <summary>
+    For a given permission type (geolocation, and so on. see the corresponding
+    histrogram suffixes), the number of off-origin iframes whose embedding
+    origin has that permission type already allowed, blocked, or neither.

[mlamouri (slow - plz ping), 2015/06/29 14:23:07]

The description is confusing. Especially the "already". We might end up counting
embedders that never had their permissions changed, right?

[keenanb, 2015/06/29 19:09:00]

you are right; it is confusing. i changed it.

+  </summary>
+</histogram>
+
+<histogram name="ContentSettings.PermissionRequested.OnOrigin"

[mlamouri (slow - plz ping), 2015/06/29 14:23:07]

nit: s/OnOrigin/SameOrigin/ ?

[keenanb, 2015/06/29 19:09:00]

Done.

+    enum="PermissionType">
+  <owner>keenanb@google.com</owner>
+  <owner>jww@chromium.org</owner>
+  <summary>
+    The number of on-origin permission requests of each permission type
+    (geolocation, and so on).
+  </summary>
+</histogram>
+
 <histogram name="ContentSettings.PermissionRequested_InsecureOrigin"
     enum="PermissionType">
   <owner>miguelg@chromium.org</owner>
@@ -72502,7 +72523,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="PerformanceMonitor.HighCPU"/>
 </histogram_suffixes>
 
-<histogram_suffixes name="PermissionActions">
+<histogram_suffixes name="PermissionTypes">
   <suffix name="MidiSysEx" label="Midi SysEx permsision actions"/>
   <suffix name="PushMessaging" label="Push messaging permission actions"/>
   <suffix name="Notifications" label="Notification permission actions"/>
@@ -72511,6 +72532,8 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="ContentSettings.PermissionActions"/>
   <affected-histogram name="ContentSettings.PermissionActionsInsecureOrigin"/>
   <affected-histogram name="ContentSettings.PermissionActionsSecureOrigin"/>
+  <affected-histogram name="ContentSettings.PermissionRequested.OffOrigin"/>
+  &quot;

[keenanb, 2015/06/25 21:52:07]

this " symbol was inserted automatically by a script. i can't tell whether
it is a bug.

 </histogram_suffixes>
 
 <histogram_suffixes name="PNaClTranslatorTypes" separator=".">