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 dd30a051a16e49a857976f4ad4f5e74d7480a684..cfba6f3e1f38f71b68f2a88e95824715bc370ca7 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -28156,6 +28156,11 @@ 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"/>
@@ -28619,6 +28624,17 @@ 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="Succes"/>

[Lei Zhang, 2017/05/25 23:23:40]

Typo

[skau, 2017/05/26 17:18:02]

Done.

+  <int value="2" label="Printer Unreachable"/>
+  <int value="3" label="Could not contact debugd"/>
+  <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="PrintPreviewFailureType" type="int">
   <int value="0" label="No error"/>
   <int value="1" label="Bad settings from print preview tab"/>