Support needed to measure user and service traffic in Chrome.

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 0596909634f63d735965d6a0df5c045a03e009e9..73085197e9b9d4ea19f4ae84dfb26a0c5091a81e 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -5632,6 +5632,38 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="DataUse.MessageSize" units="bytes">
+  <owner>amohammadkhan@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    The request and reponse size of the messages exchanged by a service. It is
+    logged when the URLReqeust of a service is completed. The service name is
+    added as a sufffix to this histogram name.
+  </summary>
+</histogram>
+
+<histogram name="DataUse.NotUser" units="bytes">
+  <owner>amohammadkhan@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    The total data use of Chrome's services. There is no ResourceRequestInfo
+    attached to these requests.
+  </summary>
+</histogram>
+
+<histogram name="DataUse.Services" enum="DataUseServices">
+  <owner>amohammadkhan@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    The request and reponse size of the messages exchanged by all the services.
+    Whenever a URLRequest of a service is completed, the number of exchanged
+    bytes are logged in this histogram. The buckets in this histogram are
+    services, so it makes it possible to compare the use of different services
+    in different conditions. Different conditions are added as suffixes to this
+    histogram.
+  </summary>
+</histogram>
+
 <histogram name="DataUse.Sync.Download.Bytes" enum="SyncModelTypes">
   <owner>amohammadkhan@chromium.org</owner>
   <owner>bengr@chromium.org</owner>
@@ -5680,6 +5712,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="DataUse.User" units="bytes">

[Alexei Svitkine (slow), 2015/09/01 20:04:04]

Similar comment I've had before. DataUse.User doesn't tell me what's being
measured.

How about DataUse.TrafficSize.User or similar.

The other one can also use the same pattern - though I wonder if renaming
"NotUser" to something like "System" or "Chrome" might be clearer.

[amohammadkhan, 2015/09/01 23:02:43]

Done.

+  <owner>amohammadkhan@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    The total amount of data use of Chrome for user traffic. This traffic has
+    content::ResourceRequestInfo attached to its request.
+  </summary>
+</histogram>
+
 <histogram name="DefaultBrowser.InteractionResult"
     enum="MakeChromeDefaultResult">
   <owner>gab@chromium.org</owner>
@@ -55077,6 +55118,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
       label="Arrived at settings menu by another path: entered on, exited on"/>
 </enum>
 
+<enum name="DataUseServices" type="int">
+  <int value="0" label="Not Tagged"/>
+  <int value="1" label="Suggestions Service"/>
+</enum>
+
 <enum name="DecodedImageType" type="int">
   <int value="0" label="kImageUnknown"/>
   <int value="1" label="kImageJPEG"/>
@@ -74579,6 +74625,26 @@ To add a new entry, add it with any value and run test to compute valid value.
       name="DataReductionProxy.RequestCompletionErrorCodes.MainFrame"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="DataUse.Dimensions" separator=".">
+  <suffix name="Upstream.Background.NotCellular"/>
+  <suffix name="Upstream.Background.Cellular"/>
+  <suffix name="Upstream.Foreground.NotCellular"/>
+  <suffix name="Upstream.Foreground.Cellular"/>
+  <suffix name="Downstream.Background.NotCellular"/>
+  <suffix name="Downstream.Background.Cellular"/>
+  <suffix name="Downstream.Foreground.NotCellular"/>
+  <suffix name="Downstream.Foreground.Cellular"/>
+  <affected-histogram name="DataUse.NotUser"/>
+  <affected-histogram name="DataUse.Services"/>
+  <affected-histogram name="DataUse.User"/>
+</histogram_suffixes>
+
+<histogram_suffixes name="DataUse.Service.Types" separator=".">
+  <suffix name="NotTagged"/>
+  <suffix name="Suggestions"/>
+  <affected-histogram name="DataUse.MessageSize"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="DefaultAppsExperiment">
   <suffix name="NoDefaultApps" label="User's without default apps installed"/>
   <suffix name="WithDefaultApps" label="User's with default apps installed"/>