Add metrics to printer setup flow.

tools/metrics/histograms/enums.xml

Index: tools/metrics/histograms/enums.xml
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 0afb7ec1e259ee6fd0a70152ba03e212811f5017..d3b0d66e69362442ec026f489f039c50acc80227 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -28683,6 +28683,11 @@ from previous Chrome versions.
   <int value="5" label="Shortcut. Restart required."/>
 </enum>
 
+<enum name="PpdSource" type="int">
+  <int value="0" label="PPD provided by user"/>
+  <int value="1" label="PPD downloaded from SCS"/>
+</enum>
+
 <enum name="PrecacheEvents" type="int">
   <int value="0" label="PRECACHE_TASK_STARTED_PERIODIC"/>
   <int value="1" label="PRECACHE_TASK_STARTED_ONEOFF"/>
@@ -29157,6 +29162,17 @@ from previous Chrome versions.
   <int value="4" label="Printer provider Web Store app launched"/>
 </enum>
 
+<enum name="PrinterSetupResult" type="int">
+  <int value="0" label="Fatal Error"/>
+  <int value="1" label="Success"/>
+  <int value="2" label="Printer Unreachable"/>
+  <int value="3" label="Could not contact debugd over dbus"/>
+  <int value="10" label="PPD exceeds size limit"/>
+  <int value="11" label="PPD Rejected by cupstestppd"/>
+  <int value="12" label="Could not find PPD"/>
+  <int value="13" label="Failed to download PPD"/>
+</enum>
+
 <enum name="PrintJobResult" type="int">
   <int value="0" label="Unknown"/>
   <int value="1" label="Successful Finish"/>