Adding histograms missing from a previous commit

Review URL: https://codereview.chromium.org/602283002

Cr-Commit-Position: refs/heads/master@{#296995}

tools/metrics/histograms/histograms.xml

@@ -32816,6 +32816,30 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="SoftwareReporter.MajorVersion">
+  <owner>mad@chromium.org</owner>
+  <summary>
+    As SoftwareReporter.MinorVersion, but a double word combination of the other
+    components of the version of the software reporter. The high word is the
+    first component when there are more than one, and the low word is either the
+    second or third one, depending if there are at least 3, or 4 components.
+  </summary>
+</histogram>
+
+<histogram name="SoftwareReporter.MinorVersion">
+  <owner>mad@chromium.org</owner>
+  <summary>
+    The last component of the version of the software reporter that was executed
+    so we can identify when users are not getting their component updated as
+    quickly as we expect it.
+  </summary>
+</histogram>
+
+<histogram name="SoftwareReporter.PromptUsage" enum="SRTPromptUsage">
+  <owner>mad@chromium.org</owner>
+  <summary>Usage of the Software Removal Tool (SRT) Prompt.</summary>
+</histogram>
+
 <histogram name="SoftwareReporter.Step" enum="SwReporterStep">
   <owner>mad@chromium.org</owner>
   <summary>
@@ -51256,6 +51280,12 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="5" label="DEPRECATION_RAZE_FAILED">Raze failed.</int>
 </enum>
 
+<enum name="SRTPromptUsage" type="int">
+  <int value="0" label="Shown"/>
+  <int value="1" label="Accepted"/>
+  <int value="2" label="Denied"/>
+</enum>
+
 <enum name="SSLCaptivePortal" type="int">
   <int value="0"
       label="Chrome captive portal detection enabled