This adds some plumbing for propagating the reason for a renderer's death

chrome/common/notification_type.h

Index: chrome/common/notification_type.h
diff --git a/chrome/common/notification_type.h b/chrome/common/notification_type.h
index 5bd1e96c3b9db2d75451f6d79cb46fddd1864287..2ea5c9a7f15672a18a59407ce912ff8fc43412c5 100644
--- a/chrome/common/notification_type.h
+++ b/chrome/common/notification_type.h
@@ -549,12 +549,20 @@ class NotificationType {
     // The details are in a Details<ChildProcessInfo>.
     CHILD_PROCESS_HOST_DISCONNECTED,
 
-    // This message is sent when a child process disappears unexpectedly.
-    // There is no usable source, since it is sent from an ephemeral task;
-    // register for AllSources() to receive this notification.  The details are
-    // in a Details<ChildProcessInfo>.
+    // This message is sent when a child process disappears
+    // unexpectedly as a result of a crash.  There is no usable
+    // source, since it is sent from an ephemeral task; register for
+    // AllSources() to receive this notification.  The details are in
+    // a Details<ChildProcessInfo>.
     CHILD_PROCESS_CRASHED,
 
+    // This message is sent when a child process disappears
+    // unexpectedly as a result of a termination signal.  There is no
+    // usable source, since it is sent from an ephemeral task;
+    // register for AllSources() to receive this notification.  The
+    // details are in a Details<ChildProcessInfo>.
+    CHILD_PROCESS_WAS_KILLED,
+
     // This message indicates that an instance of a particular child was
     // created in a page.  (If one page contains several regions rendered by
     // the same child, this notification will occur once for each region