Add the Stability.BrowserExitCodes metric and a couple of relevant exit codes.

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 f902aaaf677b7dc128e7ad81fae110e3d50117ce..c0f39a8221b29af28156f2b305fcc9539d8149ee 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -35128,6 +35128,17 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Stability.BrowserExitCodes" enum="WindowsExitCode">
+  <owner>siggi@chromium.org</owner>
+  <owner>erikwright@chromium.org</owner>
+  <summary>
+    Records the exit code of the browser process (on Windows) from the previous
+    launch. On crash, the exit code will indicate the exception code of the
+    crash. This is emitted in stability data with the first report on a
+    subsequent launch.
+  </summary>
+</histogram>
+
 <histogram name="Stars.Goog_Related" units="percent">
   <owner>yefim@chromium.org</owner>
   <summary>
@@ -56391,6 +56402,14 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="3" label="Desktop Aura"/>
 </enum>
 
+<enum name="WindowsExitCode" type="int">
+  <int value="0" label="Success"/>
+  <int value="1" label="Error"/>
+  <int value="3221225477" label="Access Violation"/>
+<!-- TODO(siggi): Add other values here at need. -->
+
+</enum>
+
 <enum name="WindowsVersion" type="int">
   <int value="0" label="Pre-XP"/>
   <int value="1" label="XP"/>