Adding previews information to PLM UKM

chrome/browser/previews/previews_infobar_delegate.h

Index: chrome/browser/previews/previews_infobar_delegate.h
diff --git a/chrome/browser/previews/previews_infobar_delegate.h b/chrome/browser/previews/previews_infobar_delegate.h
index 47245eace9816691ce6460ebb2aea829b7e751bf..31257d8830e90e6b751aa4b4691880bd47b46ed5 100644
--- a/chrome/browser/previews/previews_infobar_delegate.h
+++ b/chrome/browser/previews/previews_infobar_delegate.h
@@ -68,6 +68,10 @@ class PreviewsInfoBarDelegate : public ConfirmInfoBarDelegate {
   int GetButtons() const override;
   bool LinkClicked(WindowOpenDisposition disposition) override;
 
+  // Records that the navigation currently committed in this web contents as an
+  // opt out in PLM UKM.
+  void RecordUKMOptOut();

[rkaplow, 2017/06/27 22:17:09]

I might rename these method - it sounds like it is related to opting out of UKM

[RyanSturm, 2017/07/11 21:46:41]

Done.

+
   previews::PreviewsType previews_type_;
   // The time at which the preview associated with this infobar was created. A
   // value of zero means that the creation time is unknown.