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 878508a13163935b5f8339f56ff565b4a1fbde50..e4030bde6dc326d3c444e3ed84f4e4f7dc7be0c9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -5648,6 +5648,30 @@ 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.

[Ilya Sherman, 2015/09/04 22:10:12]

nit: "sufffix" -> "suffix"

[amohammadkhan, 2015/09/05 00:58:03]

Done.

+  </summary>
+</histogram>
+
+<histogram name="DataUse.MessageSize.AllServices" 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

[Ilya Sherman, 2015/09/04 22:10:12]

nit: "number ... are" -> "number ... is"

[amohammadkhan, 2015/09/05 00:58:03]

Done.

+    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. If the OS is not Android all the requests are considered
+    foreground.
+  </summary>
+</histogram>
+
 <histogram name="DataUse.Sync.Download.Bytes" enum="SyncModelTypes">
   <owner>amohammadkhan@chromium.org</owner>
   <owner>bengr@chromium.org</owner>
@@ -5696,6 +5720,26 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="DataUse.TrafficSize.System" 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. If the OS is not Android all the requests are
+    considered foreground.
+  </summary>
+</histogram>
+
+<histogram name="DataUse.TrafficSize.User" units="bytes">
+  <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. If the OS is not
+    Android all the requests are considered foreground.
+  </summary>
+</histogram>
+
 <histogram name="DefaultBrowser.InteractionResult"
     enum="MakeChromeDefaultResult">
   <owner>gab@chromium.org</owner>
@@ -55183,6 +55227,11 @@ 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"/>
@@ -74720,6 +74769,26 @@ 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.MessageSize.AllServices"/>
+  <affected-histogram name="DataUse.TrafficSize.System"/>
+  <affected-histogram name="DataUse.TrafficSize.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"/>