Add new UMA to record the bytes wasted due to download resumption

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 8b647fa873307b769a21dc340e6f20e555187554..b58b45780ad255ef5a84ab8dca55c6fcef003b41 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -27974,6 +27974,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram base="true" name="MobileDownload.BytesWasted.ChromeNetworkStack"
+    units="KB">
+  <owner>qinmin@chromium.org</owner>
+  <summary>
+    Android: Records the total data wasted during download due to resumptions.
+  </summary>
+</histogram>
+
 <histogram name="MobileDownload.CancelReason" enum="MobileDownloadCancelReason">
   <owner>qinmin@chromium.org</owner>
   <summary>Android: Records the reason that a download is canceled.</summary>
@@ -113873,6 +113881,13 @@ value.
   <affected-histogram name="MobileDownload.BytesDownloaded"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="MobileDownloadBytesWastedTypes" separator=".">
+  <suffix name="Failure" label="Recorded upon download failure."/>
+  <suffix name="Success" label="Recorded upon download success."/>
+  <suffix name="Cancel" label="Recorded upon download Cancel."/>
+  <affected-histogram name="MobileDownload.BytesWasted.ChromeNetworkStack"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="MobileDownloadDownloadTimeTypes" separator=".">
   <suffix name="ChromeNetworkStack.Cancel"/>
   <suffix name="ChromeNetworkStack.Failure"/>