Add UMA histograms and logging for bad IPC message handling

extensions/browser/bad_message.cc

Index: extensions/browser/bad_message.cc
diff --git a/extensions/browser/bad_message.cc b/extensions/browser/bad_message.cc
new file mode 100644
index 0000000000000000000000000000000000000000..85ce5d61899d5beb5df54261c4ee330413cd7647
--- /dev/null
+++ b/extensions/browser/bad_message.cc
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "extensions/browser/bad_message.h"
+
+#include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
+#include "content/public/browser/render_process_host.h"
+
+namespace extensions {
+namespace bad_message {
+
+void ReceivedBadMessage(content::RenderProcessHost* host,
+                        BadMessageReason reason) {
+  LOG(ERROR) << "Terminating extension renderer for bad IPC message, reason "
+             << reason;
+  UMA_HISTOGRAM_ENUMERATION("Stability.BadMessageTerminated.Extensions", reason,
+                            BAD_MESSAGE_MAX);
+  host->ShutdownForBadMessage();
+}
+
+}  // namespace bad_message
+}  // namespace extensions