[Remote suggestions] Log favicon fetch result for both code paths

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 18ad474ad9b6740d66d9e28df345bcade93ab07f..df0fe119abcf39968f15ffd5e572372fdcd8f3f2 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -41424,6 +41424,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NewTabPage.ContentSuggestions.ArticleFaviconFetchResult"
+    enum="FaviconFetchResult">
+  <owner>jkrcal@chromium.org</owner>
+  <summary>
+    Android: Result of fetching a favicon for an article suggestion on the New
+    Tab Page.
+  </summary>
+</histogram>
+
+<histogram name="NewTabPage.ContentSuggestions.ArticleFaviconFetchTime"
+    units="ms">
+  <owner>jkrcal@chromium.org</owner>
+  <summary>
+    Android: Time it takes to fetch a favicon for an article suggestion on the
+    New Tab Page.
+  </summary>
+</histogram>
+
 <histogram name="NewTabPage.ContentSuggestions.BackgroundFetchTrigger"
     enum="BackgroundFetchTrigger">
   <owner>jkrcal@chromium.org</owner>
@@ -93407,6 +93425,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </int>
 </enum>
 
+<enum name="FaviconFetchResult" type="int">
+  <int value="0" label="SUCCESS_CACHED">
+    Success - favicon found in local cache
+  </int>
+  <int value="1" label="SUCCESS_FETCHED">
+    Success - favicon fetched from the server
+  </int>
+  <int value="2" label="FAILURE">Failure - favicon not available</int>
+</enum>
+
 <enum name="FeatureObserver" type="int">
 <!-- Generated from third_party/WebKit/Source/core/frame/UseCounter.h -->