Add stats to distinguish android renderer crashes.

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 83f6ec74d3370d1bb191b6e737d6446990429147..4dd982186e2f7511b37587214992d3e2075181fd 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -47789,6 +47789,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Tab.RendererDetailedExitStatus"
+    enum="TabRendererDetailedExitStatus">
+  <owner>wnwen@chromium.org</owner>
+  <summary>
+    Breakdown of renderer exit status. An extension of the OOM protected and
+    foreground app count in Tab.RendererExitStatus. Only recorded on Android.
+  </summary>
+</histogram>
+
+<histogram name="Tab.RendererExitStatus" enum="TabRendererExitStatus">
+  <owner>wnwen@chromium.org</owner>
+  <summary>
+    The status of a renderer when the browser notices that the process has
+    exited. Only recorded on Android.
+  </summary>
+</histogram>
+
 <histogram name="Tab.RestoreResult" enum="TabRestoreResult">
   <owner>lliabraa@chromium.org</owner>
   <summary>
@@ -75511,6 +75528,18 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="2" label="Hidden in background app"/>
 </enum>
 
+<enum name="TabRendererDetailedExitStatus" type="int">
+  <int value="0" label="No crash"/>
+  <int value="1" label="Valid crash"/>
+</enum>
+
+<enum name="TabRendererExitStatus" type="int">
+  <int value="0" label="OOM protected in foreground app"/>
+  <int value="1" label="OOM protected in background app"/>
+  <int value="2" label="Not protected in foreground app"/>
+  <int value="3" label="Not protected in background app"/>
+</enum>
+
 <enum name="TabRestoreResult" type="int">
   <int value="0" label="Failure (other)"/>
   <int value="1" label="Success"/>