HeadlessWebContents:Observer to observe render process exit status

headless/app/headless_shell.cc

Index: headless/app/headless_shell.cc
diff --git a/headless/app/headless_shell.cc b/headless/app/headless_shell.cc
index b57fc5f9070de1e36aa9bfb743c76945ef53ca64..6f291a6cd6b9f8a71cc852e80644bcd69aec76a3 100644
--- a/headless/app/headless_shell.cc
+++ b/headless/app/headless_shell.cc
@@ -119,7 +119,10 @@ class HeadlessShell : public HeadlessWebContents::Observer,
     if (!RemoteDebuggingEnabled()) {
       devtools_client_->GetEmulation()->GetExperimental()->RemoveObserver(this);
       devtools_client_->GetPage()->RemoveObserver(this);
-      web_contents_->GetDevToolsTarget()->DetachClient(devtools_client_.get());
+      if (web_contents_->GetDevToolsTarget()) {
+        web_contents_->GetDevToolsTarget()->DetachClient(
+            devtools_client_.get());
+      }
     }
     web_contents_->RemoveObserver(this);
     web_contents_ = nullptr;
@@ -159,6 +162,15 @@ class HeadlessShell : public HeadlessWebContents::Observer,
     // TODO(skyostil): Implement more features to demonstrate the devtools API.
   }
 
+  void RenderProcessExited(base::TerminationStatus status,
+                           int exit_code) override {
+    if (status == base::TERMINATION_STATUS_NORMAL_TERMINATION)
+      return;
+
+    LOG(ERROR) << "Abnormal renderer termination.";
+    Shutdown();
+  }
+
   void PollReadyState() {
     // We need to check the current location in addition to the ready state to
     // be sure the expected page is ready.