[Icons NTP] Add a flag to enable large icons on the NTP.

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 3940213eeb079831d8279beb9f4adfe4c5768eb6..2da97d39af7af3e0715844c3b7ac760b79afc1bd 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -53289,6 +53289,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-1832575380" label="show-saved-copy"/>
   <int value="-1821058653" label="enable-delay-agnostic-aec"/>
   <int value="-1767470652" label="out-of-process-pdf"/>
+  <int value="-1751928267" label="disable-icon-ntp"/>
   <int value="-1746767834" label="ssl-interstitial-v2-gray"/>
   <int value="-1740519217" label="disable-software-rasterizer"/>
   <int value="-1735643253" label="enable-display-list-2d-canvas"/>
@@ -53640,6 +53641,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1966730288" label="disable-threaded-compositing"/>
   <int value="1969604362" label="enable-pinch-virtual-viewport"/>
   <int value="1980011075" label="debug-packed-apps"/>
+  <int value="1993258379" label="enable-icon-ntp"/>
   <int value="2000091128" label="enable-touch-hover"/>
   <int value="2004829262" label="enable-webgl-draft-extensions"/>
   <int value="2037756154" label="enable-impl-side-painting"/>