Add UMA stats for which icon types are shown and clicked on the NTP.

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index 238013c43500c91f346fa6b7a071d481af1ad2a8..f4263d380058385bc683eb7f5584cd67c8db813a 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -186,6 +186,7 @@ java_cpp_enum("chrome_android_java_enums_srcjar") {
   sources = [
     "//chrome/browser/android/activity_type_ids.h",
     "//chrome/browser/android/feedback/connectivity_checker.cc",
+    "//chrome/browser/android/most_visited_sites.cc",
     "//chrome/browser/android/shortcut_info.h",
     "//chrome/browser/android/tab_android.h",
     "//chrome/browser/profiles/profile_metrics.h",
@@ -195,6 +196,7 @@ java_cpp_enum("chrome_android_java_enums_srcjar") {
   outputs = [
     "org/chromium/chrome/browser/ActivityTypeIds.java",
     "org/chromium/chrome/browser/feedback/ConnectivityCheckResult.java",
+    "org/chromium/chrome/browser/ntp/MostVisitedTileType.java",
     "org/chromium/chrome/browser/ShortcutSource.java",
     "org/chromium/chrome/browser/TabLoadStatus.java",
     "org/chromium/chrome/browser/profiles/ProfileAccountManagementMetrics.java",