Adding UMA for data reduction proxy page load size/savings

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 ffdf9a2f78148f65ef0611966dc01648a55f454a..a010c648ccfa6f73f6c78d1970927b7e6aa797b0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -42712,6 +42712,161 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.CompressionRatio"
+    units="%">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The ratio of network bytes received to network bytes the user would have

[tbansal1, 2017/01/18 23:34:49]

Add: times 100

[RyanSturm, 2017/01/18 23:54:19]

Done.

+    seen without data reduction proxy (not including headers) in a page load
+    that had its main resource was loaded through data reduction proxy. Recorded

[tbansal1, 2017/01/18 23:34:49]

Remove "was"?

[RyanSturm, 2017/01/18 23:54:19]

Done.

+    as a percent if the data reduction proxy saved the user data. Recorded per
+    page load when the user navigates away, hides the tab, or backgrounds the
+    app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.Inflation"
+    units="KB">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network bytes (not including headers) that the data reduction

[tbansal1, 2017/01/18 23:34:49]

kilobytes?
If the reader does not look at the units, they may assume it is in bytes.

[RyanSturm, 2017/01/18 23:54:19]

Done.

+    proxy inflated for the user in a page load that had its main resource was
+    loaded through data reduction proxy. Recorded per page load when the user
+    navigates away, hides the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.InflationPercent"
+    units="%">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The inflation in network bytes (not including headers) the user saw due to
+    using data reduction proxy in a page load that had its main resource was
+    loaded through data reduction proxy. Recorded as a percent when the user saw
+    inflated data. Recorded per page load when the user navigates away, hides
+    the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.NonProxied"
+    units="KB">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network bytes that were not fetched through the data reduction
+    proxy (not including headers) in a page load that had its main resource was
+    loaded through data reduction proxy. Recorded per page load when the user
+    navigates away, hides the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.Original"
+    units="KB">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network bytes (not including headers) that the user would have
+    seen without using data reduction proxy in a page load that had its main
+    resource was loaded through data reduction proxy. Recorded per page load
+    when the user navigates away, hides the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.PercentProxied"
+    units="%">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The percent of network bytes (not including headers) in a page load that
+    went through data reduction proxy when the main resource was loaded through
+    data reduction proxy. Recorded per page load when the user navigates away,
+    hides the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.Proxied"
+    units="KB">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network bytes that were fetched through the data reduction
+    proxy (not including headers) in a page load that had its main resource was
+    loaded through data reduction proxy. Recorded per page load when the user
+    navigates away, hides the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Bytes.Network.Savings"
+    units="KB">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network bytes (not including headers) that the data reduction
+    proxy saved the user in a page load that had its main resource was loaded
+    through data reduction proxy. Recorded per page load when the user navigates
+    away, hides the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Requests.Network">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network requests in a page load when the main resource was
+    loaded through data reduction proxy. Recorded per page load when the user
+    navigates away, hides the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Requests.Network.NonProxied">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network requests in a page load that were not fetched through
+    the data reduction proxy when the main resource was loaded through data
+    reduction proxy. Recorded per page load when the user navigates away, hides
+    the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Requests.Network.PercentProxied"
+    units="%">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The percent of network requests in a page load that use data reduction proxy
+    when the main resource was loaded through data reduction proxy. Recorded per
+    page load when the user navigates away, hides the tab, or backgrounds the
+    app.
+  </summary>
+</histogram>
+
+<histogram
+    name="PageLoad.Clients.DataReductionProxy.PageLoad.Experimental.Requests.Network.Proxied">
+  <owner>bengr@chromium.org</owner>
+  <owner>ryansturm@chromium.org</owner>
+  <summary>
+    The number of network requests in a page load that were fetched through the
+    data reduction proxy when the main resource was loaded through data
+    reduction proxy. Recorded per page load when the user navigates away, hides
+    the tab, or backgrounds the app.
+  </summary>
+</histogram>
+
 <histogram name="PageLoad.Clients.DocWrite.Block.ReloadCount">
   <owner>shivanisha@chromium.org</owner>
   <owner>bmcquade@chromium.org</owner>
@@ -113962,6 +114117,7 @@ value.
   <affected-histogram name="PageLoad.DocumentTiming.NavigationToFirstLayout"/>
   <affected-histogram
       name="PageLoad.DocumentTiming.NavigationToLoadEventFired"/>
+  <affected-histogram name="PageLoad.Experimental.Bytes.Network"/>
   <affected-histogram
       name="PageLoad.Experimental.PaintTiming.NavigationToFirstMeaningfulPaint"/>
   <affected-histogram