Add UMA metric for GetHash parsing errors.

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 9483803bb475e69cc4479f85ba377ac320056dba..11ab77435d7c185f6dcb525d7542afb96bb0eada 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -40286,6 +40286,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="SafeBrowsing.ParseV4HashResult"
+    enum="SafeBrowsingParseV4HashResult">
+  <owner>kcarattini@chromium.org</owner>
+  <summary>
+    Track the parsing results of a status 200 GetV4Hash request.
+  </summary>
+</histogram>
+
 <histogram name="SafeBrowsing.Pref.Extended" enum="BooleanEnabled">
   <owner>nparker@chromium.org</owner>
   <summary>
@@ -75634,6 +75642,14 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1" label="Kill (He's dead, Jim!)"/>
 </enum>
 
+<enum name="SafeBrowsingParseV4HashResult" type="int">
+  <int value="0" label="PARSE_FROM_STRING_ERROR"/>
+  <int value="1" label="UNEXPECTED_THREAT_ENTRY_TYPE_ERROR"/>
+  <int value="2" label="UNEXPECTED_THREAT_TYPE_ERROR"/>
+  <int value="3" label="UNEXPECTED_PLATFORM_TYPE_ERROR"/>
+  <int value="4" label="NO_METADATA_ERROR"/>
+</enum>
+
 <enum name="SavePasswordPromptResponseType" type="int">
   <int value="0" label="NO_RESPONSE"/>
   <int value="1" label="REMEMBER_PASSWORD"/>