Parallelizable download metrics.

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 42c2950aa23979e887c9020e93de5b4c8832031c..6d61f4548a59a29bf0e3d6f1d8bbcdfc6ba1ca5b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -14340,6 +14340,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram base="true" name="Download.Parallelizable.DownloadTime" units="ms">

[David Trainor- moved to gerrit, 2017/05/17 17:23:53]

Add something like the following?  I seem to see this sometimes.

<!-- Name completed by histogram_suffixes name="ParallelizableDownloadFileSize"
-->

[xingliu, 2017/05/17 18:04:11]

Done.

+  <owner>xingliu@chromium.org</owner>
+  <summary>The download time for a parallelizable download.</summary>
+</histogram>
+
+<histogram name="Download.Parallelizable.FileSize" units="KB">
+  <owner>xingliu@chromium.org</owner>
+  <summary>The download size of a parallelizable download.</summary>
+</histogram>
+
 <histogram base="true" name="Download.ParallelizableDownloadBandwidth"
     units="bytes/second">
   <owner>qinmin@chromium.org</owner>
@@ -90195,6 +90205,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <affected-histogram name="Download.ParallelizableDownloadBandwidth"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="ParallelizableDownloadFileSize" separator=".">
+  <suffix name="0.5MB"
+      label="Parallelizable download with file size less or equal to 0.5MB."/>
+  <suffix name="1MB"
+      label="Parallelizable download with file size less or equal to 1MB."/>

[David Trainor- moved to gerrit, 2017/05/17 17:23:53]

between 0.5 and 1mb?  Same for all others?

[xingliu, 2017/05/17 18:04:11]

Done.

+  <suffix name="3MB"
+      label="Parallelizable download with file size less or equal to 3MB."/>
+  <suffix name="10MB"
+      label="Parallelizable download with file size less or equal to 10MB."/>
+  <suffix name="50MB"
+      label="Parallelizable download with file size less or equal to 50MB."/>
+  <suffix name="GT50MB"
+      label="Parallelizable download with file size greater to 50MB."/>
+  <affected-histogram name="Download.Parallelizable.DownloadTime"/>
+  <affected-histogram name="Download.ParallelizableDownloadBandwidth"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="PasswordCustomPassphrase" separator=".">
   <suffix name="WithCustomPassphrase"/>
   <suffix name="WithoutCustomPassphrase"/>