[Offline Pages] Adds UMA for effective network connection on api calls.

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 78221f8c25fd9e29fc6db64a1d9a50a6553e8b0c..3a7e5c9942194a7c89a138caed0c96c75b4c2ac0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -39132,6 +39132,51 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="OfflinePages.Background.EffectiveConnectionType.PauseRequests"
+    enum="NQEEffectiveConnectionType">
+  <owner>dougarnett@chromium.org</owner>
+  <summary>
+    Effective connection type when pausing one or more background loads is
+    requested.
+
+    This metric is recorded for RequestCoordinator::PauseRequests API calls.
+  </summary>
+</histogram>
+
+<histogram
+    name="OfflinePages.Background.EffectiveConnectionType.RemoveRequests"
+    enum="NQEEffectiveConnectionType">
+  <owner>dougarnett@chromium.org</owner>
+  <summary>
+    Effective connection type when removing one or more background loads is
+    requested.
+
+    This metric is recorded for RequestCoordinator::RemoveRequests API calls.
+  </summary>
+</histogram>
+
+<histogram
+    name="OfflinePages.Background.EffectiveConnectionType.ResumeRequests"
+    enum="NQEEffectiveConnectionType">
+  <owner>dougarnett@chromium.org</owner>
+  <summary>
+    Effective connection type when resuming one or more background loads is
+    requested.
+
+    This metric is recorded for RequestCoordinator::ResumeRequests API calls.
+  </summary>
+</histogram>
+
+<histogram name="OfflinePages.Background.EffectiveConnectionType.SavePageLater"
+    enum="NQEEffectiveConnectionType">
+  <owner>dougarnett@chromium.org</owner>
+  <summary>
+    Effective connection type when a background load is requested.
+
+    This metric is recorded for RequestCoordinator::SavePageLater API calls.
+  </summary>
+</histogram>
+
 <histogram name="OfflinePages.Background.ImmediateStartStatus"
     enum="OfflinePagesBackgroundImmediateStartStatus">
   <owner>dougarnett@chromium.org</owner>
@@ -108986,6 +109031,8 @@ value.
   <suffix name="custom_tabs" label="Offline custom tabs"/>
   <suffix name="download" label="Offline downloaded pages"/>
   <suffix name="ntp_suggestions" label="Offline ntp suggestions"/>
+  <affected-histogram
+      name="OfflinePages.Background.EffectiveConnectionType.SavePageLater"/>
   <affected-histogram name="OfflinePages.Background.OfflinerRequestStatus"/>
   <affected-histogram name="OfflinePages.Background.TimeToCanceled"/>
   <affected-histogram name="OfflinePages.Background.TimeToSaved"/>