Add an histogram to differentiate between hang types of the renderer

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index a9bb2ae9a77e2693e017881f3a95994fabf76048..56c808e0a32c8c448c6feaceba2f2bfc6378cd35 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -4633,7 +4633,8 @@ void WebContentsImpl::OnIgnoredUIEvent() {
 }
 
 void WebContentsImpl::RendererUnresponsive(
-    RenderWidgetHostImpl* render_widget_host) {
+    RenderWidgetHostImpl* render_widget_host,
+    RenderWidgetHostDelegate::RendererUnresponsiveType type) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     OnRendererUnresponsive(render_widget_host));
 
@@ -4650,6 +4651,11 @@ void WebContentsImpl::RendererUnresponsive(
   if (DevToolsAgentHost::IsDebuggerAttached(this))
     return;
 
+  // Record histograms about the type of renderer hang.
+  UMA_HISTOGRAM_ENUMERATION(
+      "ChildProcess.HangRendererType", type,
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_MAX);
+
   // We might have been waiting for both beforeunload and unload ACK.
   // Check if tab is to be unloaded first.
   if (rfhi->IsWaitingForUnloadACK()) {