Add extra parameter to BrowserChildProcessCrashed to pass the exit_code at time of crash/termination

content/public/browser/browser_child_process_observer.h

Index: content/public/browser/browser_child_process_observer.h
diff --git a/content/public/browser/browser_child_process_observer.h b/content/public/browser/browser_child_process_observer.h
index 41c9c9d5b083c0c852f3ec5606dab714b9390163..002ec8556bb63b9ace73f63a2381093cd6403db6 100644
--- a/content/public/browser/browser_child_process_observer.h
+++ b/content/public/browser/browser_child_process_observer.h
@@ -24,7 +24,9 @@ class CONTENT_EXPORT BrowserChildProcessObserver {
       const ChildProcessData& data) {}
 
   // Called when a child process disappears unexpectedly as a result of a crash.
-  virtual void BrowserChildProcessCrashed(const ChildProcessData& data) {}
+  // |exit_code| contains the exit code from the process.
+  virtual void BrowserChildProcessCrashed(const ChildProcessData& data,
+                                          int exit_code) {}
 
   // Called when an instance of a particular child is created in a page. If one
   // page contains several regions rendered by the same child, this will be