Move JumplistIcon to JumplistIconOld only via renaming, not copy-n-delete

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 0e4685341649e14f5b558ed3ff0ba35feba1274f..aadf59e4ea3ef05553ad738696ce1959f553a08e 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -79583,6 +79583,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="WinJumplist.DetailedFolderResults"
     enum="JumplistIconsDetailedFolderOperationCategory">
+  <obsolete>
+    Obsolete 03/10/2017 as it is replaced by DetailedFolderResultsDeleteUpdated.
+  </obsolete>
   <owner>chengx@chromium.org</owner>
   <summary>
     This metric is recorded when folders JumpListIcons and JumpListIconsOld get
@@ -79596,6 +79599,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="WinJumplist.DetailedFolderResultsDeleteUpdated"
+    enum="JumplistIconsDetailedFolderOperationDeleteUpdatedCategory">
+  <owner>chengx@chromium.org</owner>
+  <summary>
+    This metric is recorded when folders JumpListIcons and JumpListIconsOld get
+    updated. These two folders are updated when tabs are closed, mostly visited
+    URLs get updated, etc. These two folders are updated as follows 1)
+    JumpListIconsOld with its content get deleted; 2) if step 1 succeeds,
+    JumpListIcons is renamed to JumpListIconsOld, 3) if any of the previous
+    steps fails, JumpListIcons is deleted, 4) A new JumpListIcons folder is
+    created if deletion of JumpListIcons' content succeeds (only fail to delete
+    the directory is okay). The status of these 4 file operations are put
+    together and recorded in this metric. The failure of any of these file
+    operations is suspected to be related to a known issue.
+  </summary>
+</histogram>
+
 <histogram name="WinJumplist.FolderMoveResults"
     enum="JumplistIconsFolderMoveCategory">
   <obsolete>
@@ -97466,6 +97486,106 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
       label="Del Dest Fail - Mov Fail - Del Src Fail - Create Src Fail"/>
 </enum>
 
+<enum name="JumplistIconsDetailedFolderOperationDeleteUpdatedCategory"
+    type="int">
+  <int value="0"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Succeed -
+             Del Src Dir Succeed - Create Src Succeed"/>
+  <int value="1"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Succeed - Del
+             Src Dir Succeed - Create Src Succeed"/>
+  <int value="2"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Succeed - Del
+             Src Dir Succeed - Create Src Succeed"/>
+  <int value="3"
+      label="Del Dest Fail - Rename Fail - Del Src Content Succeed - Del Src
+             Dir Succeed - Create Src Succeed"/>
+  <int value="4"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Fail - Del
+             Src Dir Succeed - Create Src Succeed"/>
+  <int value="5"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Fail - Del Src
+             Dir Succeed - Create Src Succeed"/>
+  <int value="6"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Fail - Del Src
+             Dir Succeed - Create Src Succeed"/>
+  <int value="7"
+      label="Del Dest Fail - Rename Fail - Del Src Content Fail - Del Src Dir
+             Succeed - Create Src Succeed"/>
+  <int value="8"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Succeed -
+             Del Src Dir Fail - Create Src Succeed"/>
+  <int value="9"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Succeed - Del
+             Src Dir Fail - Create Src Succeed"/>
+  <int value="10"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Succeed - Del
+             Src Dir Fail - Create Src Succeed"/>
+  <int value="11"
+      label="Del Dest Fail - Rename Fail - Del Src Content Succeed - Del Src
+             Dir Fail - Create Src Succeed"/>
+  <int value="12"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Fail - Del
+             Src Dir Fail - Create Src Succeed"/>
+  <int value="13"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Fail - Del Src
+             Dir Fail - Create Src Succeed"/>
+  <int value="14"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Fail - Del Src
+             Dir Fail - Create Src Succeed"/>
+  <int value="15"
+      label="Del Dest Fail - Rename Fail - Del Src Content Fail - Del Src Dir
+             Fail - Create Src Succeed"/>
+  <int value="16"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Succeed -
+             Del Src Dir Succeed - Create Src Fail"/>
+  <int value="17"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Succeed - Del
+             Src Dir Succeed - Create Src Fail"/>
+  <int value="18"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Succeed - Del
+             Src Dir Succeed - Create Src Fail"/>
+  <int value="19"
+      label="Del Dest Fail - Rename Fail - Del Src Content Succeed - Del Src
+             Dir Succeed - Create Src Fail"/>
+  <int value="20"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Fail - Del
+             Src Dir Succeed - Create Src Fail"/>
+  <int value="21"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Fail - Del Src
+             Dir Succeed - Create Src Fail"/>
+  <int value="22"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Fail - Del Src
+             Dir Succeed - Create Src Fail"/>
+  <int value="23"
+      label="Del Dest Fail - Rename Fail - Del Src Content Fail - Del Src Dir
+             Succeed - Create Src Fail"/>
+  <int value="24"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Succeed -
+             Del Src Dir Fail - Create Src Fail"/>
+  <int value="25"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Succeed - Del
+             Src Dir Fail - Create Src Fail"/>
+  <int value="26"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Succeed - Del
+             Src Dir Fail - Create Src Fail"/>
+  <int value="27"
+      label="Del Dest Fail - Rename Fail - Del Src Content Succeed - Del Src
+             Dir Fail - Create Src Fail"/>
+  <int value="28"
+      label="Del Dest Succeed - Rename Succeed - Del Src Content Fail - Del
+             Src Dir Fail - Create Src Fail"/>
+  <int value="29"
+      label="Del Dest Fail - Rename Succeed - Del Src Content Fail - Del Src
+             Dir Fail - Create Src Fail"/>
+  <int value="30"
+      label="Del Dest Succeed - Rename Fail - Del Src Content Fail - Del Src
+             Dir Fail - Create Src Fail"/>
+  <int value="31"
+      label="Del Dest Fail - Rename Fail - Del Src Content Fail - Del Src Dir
+             Fail - Create Src Fail"/>
+</enum>
+
 <enum name="JumplisticonsfolderCategory" type="int">
   <int value="0" label="Del Succeed - Mov Succeed - Create Succeed"/>
   <int value="1" label="Del Fail - Mov Succeed - Create Succeed"/>