Implemented the conversion logic from Wallet addresses to local Autofill profiles:

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 2500cffc3b898f347991816f3f717ccd8f31a748..2f80e96ac25331f08c2c11d8cf8e60e95672fee9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -3794,6 +3794,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Autofill.WalletAddressConversionType"
+    enum="AutofillWalletAddressConversionType">
+  <owner>sebsg@chromium.org</owner>
+  <summary>
+    Tracks how the different wallet addresses are converted to local autofill
+    profiles.
+  </summary>
+</histogram>
+
 <histogram name="BackgroundMode.BackgroundApplicationsCount">
   <owner>atwilson@chromium.org</owner>
   <owner>mvanouwerkerk@chromium.org</owner>
@@ -78571,6 +78580,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="11" label="User edited autofilled field (once)"/>
 </enum>
 
+<enum name="AutofillWalletAddressConversionType" type="int">
+  <int value="0" label="Merged with existing local profile"/>
+  <int value="1" label="Added as a new local profile"/>
+</enum>
+
 <enum name="AutoLaunchState" type="int">
   <int value="0" label="AUTO_LAUNCH_NONE"/>
   <int value="1" label="AUTO_LAUNCH_BACKGROUND"/>