Add histograms about files copied or movied files from or to Drive.

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 22bce4e74668df708be4521588b7a638b42864a8..d35690ccd8d718674c81fd9d2145017b63a5927e 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -5800,7 +5800,7 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 
 <histogram name="Drive.CacheDBOpenStatus" enum="DriveCacheDBOpenStatus">
   <obsolete>
-    Deperecated 8/2013.
+    Deprecated 8/2013.
   </obsolete>
   <owner>joshwoodward@google.com</owner>
   <summary>Status of drive cache metadata database open.</summary>
@@ -5814,6 +5814,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Drive.DownloadFromDriveFileSizeKB">

[Ilya Sherman, 2014/10/09 04:44:52]

nit: Please add a units attribute.

[mtomasz, 2014/10/14 04:46:00]

Done.

+  <owner>mtomasz@google.com</owner>

[Ilya Sherman, 2014/10/09 04:44:52]

nit: I suppose it's fine either way, but I think @chromium.org addresses are
preferred within the Chromium repository.

[mtomasz, 2014/10/14 04:46:00]

Done.

+  <summary>
+    Sizes of files being downloaded from Drive. Temporary histogram for
+    gathering data for crbug.com/229650.

[Ilya Sherman, 2014/10/09 04:44:52]

nit: Please prepend "http://" to the link, for increased likelihood of
autolinkification by tools.

[mtomasz, 2014/10/14 04:46:00]

Done.

+  </summary>
+</histogram>
+
 <histogram name="Drive.EntireFeedLoadTime" units="microseconds">
   <obsolete>
     Deprecated 12/2013 due to the UMA stat bucket layout change. We'll use
@@ -5960,6 +5968,23 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Drive.TransferBlockedOnJobs">
+  <owner>mtomasz@google.com</owner>
+  <summary>
+    Number of jobs which have to be completed before a newly added download or
+    download from or to Drive is requested. Temporary histogram for gathering
+    data for crbug.com/229650.
+  </summary>
+</histogram>
+
+<histogram name="Drive.UploadToDriveFileSizeKB">
+  <owner>mtomasz@google.com</owner>
+  <summary>
+    Sizes of files being uploaded to Drive. Temporary histogram for gathering
+    data for crbug.com/229650.
+  </summary>
+</histogram>
+
 <histogram name="DriveOffline.CrosAutoEnableOutcome"
     enum="CrosEnableDriveOfflineOutcome">
   <owner>joshwoodward@google.com</owner>