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 e09546cdb00a1f6f48699f642b00101ae3b64535..4c51b79c19ec83d6a5cb7dcbcdc97d449a9d9491 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -76819,6 +76819,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Webapp.InstallabilityCheckStatus.MenuItemAddToHomescreen"
+    enum="InstallabilityCheckStatus">
+  <owner>dominickn@chromium.org</owner>
+  <summary>
+    Records whether or not the installability check has completed when the user
+    taps the add to homescreen menu item on Android.
+  </summary>
+</histogram>
+
+<histogram name="Webapp.InstallabilityCheckStatus.MenuOpen"
+    enum="InstallabilityCheckStatus">
+  <owner>dominickn@chromium.org</owner>
+  <summary>
+    Records whether or not the installability check has completed when the user
+    opens the menu on Android.
+  </summary>
+</histogram>
+
 <histogram name="Webapp.Splashscreen.BackgroundColor"
     enum="SplashscreenColorStatus">
   <owner>mlamouri@chromium.org</owner>
@@ -98262,6 +98280,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="35" label="Ran by google.com/intl/ (deprecated)"/>
 </enum>
 
+<enum name="InstallabilityCheckStatus" type="int">
+  <int value="0" label="Check not started"/>
+  <int value="1" label="Check terminated before it could finish"/>
+  <int value="2" label="Check not complete for a non-PWA"/>
+  <int value="3" label="Check not complete for a PWA"/>
+  <int value="4" label="Check complete for a non-PWA"/>
+  <int value="5" label="Check complete for a PWA"/>

[Ilya Sherman, 2017/03/31 17:03:16]

nit: Here too, "PWA" is not entirely obvious.  You could mention the expanded
text in the histogram descriptions, or add hover text for these labels like so:

<int value="5" label="Check complete for a PWA">Check complete for a Progressive
Web App</int>

[dominickn, 2017/04/03 00:06:46]

Done, mentioned it in the histogram description.

+</enum>
+
 <enum name="InstallStatus" type="int">
   <int value="0" label="FIRST_INSTALL_SUCCESS"/>
   <int value="1" label="INSTALL_REPAIRED"/>