Add UMA for app info dialog

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 0ef82fff9f2756cf671835d0477609ee582d3078..1192cc7ceb7e7b7b54031825d2bf58d3d3a51d09 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -418,6 +418,25 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Apps.AppInfoDialogLaunched" enum="AppInfoDialogLaunchSource">
+  <owner>sashab@chromium.org</owner>
+  <summary>
+    The number of times the app info dialog is launched. This is gathered each
+    time the app info dialog is opened, from each of the places the dialog can
+    be opened from.
+  </summary>
+</histogram>
+
+<histogram name="Apps.AppInfoDialogOpenedForLocation" enum="AppLocation">
+  <owner>sashab@chromium.org</owner>
+  <summary>The location of the app that the dialog was opened for.</summary>
+</histogram>
+
+<histogram name="Apps.AppInfoDialogOpenedForType" enum="ExtensionType">
+  <owner>sashab@chromium.org</owner>
+  <summary>The type of the app that the dialog was opened for.</summary>
+</histogram>
+
 <histogram name="Apps.AppLaunch" enum="AppLaunch">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
@@ -35907,6 +35926,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="8" label="Cancelled"/>
 </enum>
 
+<enum name="AppInfoDialogLaunchSource" type="int">
+  <int value="0" label="Not enabled (should never be recorded)"/>
+  <int value="1" label="App List context menu"/>
+</enum>
+
 <enum name="AppLaunch" type="int">
   <int value="0" label="NTP_APPS_MAXIMIZED"/>
   <int value="1" label="NTP_APPS_COLLAPSED"/>
@@ -35967,6 +35991,20 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="4" label="SEARCH_PEOPLE"/>
 </enum>
 
+<enum name="AppLocation" type="int">
+  <int value="0" label="Invalid location"/>
+  <int value="1" label="Internal extension"/>
+  <int value="2" label="Internal extension (loaded via prefs)"/>
+  <int value="3" label="Internal extension (loaded via the registry)"/>
+  <int value="4" label="Unpacked extension"/>
+  <int value="5" label="Component app"/>
+  <int value="6" label="External extension (downloaded via prefs)"/>
+  <int value="7" label="External extension (downloaded via admin policies)"/>
+  <int value="8" label="Command-line extension"/>
+  <int value="9" label="External extension (loaded via prefs and cached)"/>
+  <int value="10" label="Component app (downloaded)"/>
+</enum>
+
 <enum name="AppPromoAction" type="int">
   <int value="0" label="PROMO_LAUNCH_APP"/>
   <int value="1" label="PROMO_LAUNCH_WEB_STORE"/>