HeadlessWebContents:Observer to observe render process exit status

headless/lib/browser/headless_devtools_client_impl.cc

Index: headless/lib/browser/headless_devtools_client_impl.cc
diff --git a/headless/lib/browser/headless_devtools_client_impl.cc b/headless/lib/browser/headless_devtools_client_impl.cc
index 833b9dc49afb1d85c386d64865b20448c98cfa57..cd52cbb31dad3e84085ee32cc56f81481b14c931 100644
--- a/headless/lib/browser/headless_devtools_client_impl.cc
+++ b/headless/lib/browser/headless_devtools_client_impl.cc
@@ -133,6 +133,11 @@ bool HeadlessDevToolsClientImpl::DispatchEvent(
     return false;
   EventHandlerMap::const_iterator it = event_handlers_.find(method);
   if (it == event_handlers_.end()) {
+    // Silently swallow errors related to the target crashing. This can be
+    // observed via HeadlessWebContents::Observer::RenderProcessExited.
+    if (method == "Inspector.targetCrashed")
+      return true;
+
     NOTREACHED() << "Unknown event: " << method;
     return false;
   }