Add UMA for autoblocking and embargoing.

chrome/browser/permissions/permission_context_base.cc

Index: chrome/browser/permissions/permission_context_base.cc
diff --git a/chrome/browser/permissions/permission_context_base.cc b/chrome/browser/permissions/permission_context_base.cc
index c00f3e7aa503570ad94c778a64b0b4923857aa9d..57d3479adb7ea1dc0731cbadb849391a509655f1 100644
--- a/chrome/browser/permissions/permission_context_base.cc
+++ b/chrome/browser/permissions/permission_context_base.cc
@@ -316,6 +316,11 @@ void PermissionContextBase::PermissionDecided(
     // The permission has been embargoed, so it is blocked for this permission
     // request, but not persisted.
     content_setting = CONTENT_SETTING_BLOCK;

[raymes, 2017/02/03 19:56:20]

This is slightly orthogonal to this CL, but I think we can just remove this line
and rework this into:
if (content_setting == CONTENT_SETTING_DEFAULT)
  PermissionUmaUtil::RecordPermissionEmbargoReason

+  } else {
+    // If a decision was made, and it did not exceed the number of allowable
+    // dismissals, then it cannot have been embargoed.
+    PermissionUmaUtil::RecordPermissionEmbargoReason(
+        PermissionEmbargoReason::NOT_EMBARGOED);
   }
 
   NotifyPermissionSet(id, requesting_origin, embedding_origin, callback,