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 ef8bc66db18dc954d3adf5d748c0be37bf4023e8..ed4281631ae4539e348e05b2d6f7d17025c9ef2f 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -4610,7 +4610,8 @@ 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));
 
@@ -4627,6 +4628,11 @@ 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()) {