[DevTools] Implement Inspector.interstitial events.

content/browser/devtools/render_view_devtools_agent_host.cc

Index: content/browser/devtools/render_view_devtools_agent_host.cc
diff --git a/content/browser/devtools/render_view_devtools_agent_host.cc b/content/browser/devtools/render_view_devtools_agent_host.cc
index 87de83197993cf69f1756d904e0b5b5d94ecca84..c1f7d1ffa1ba81fc806e6178a94aca53deac976a 100644
--- a/content/browser/devtools/render_view_devtools_agent_host.cc
+++ b/content/browser/devtools/render_view_devtools_agent_host.cc
@@ -319,6 +319,8 @@ bool RenderViewDevToolsAgentHost::OnMessageReceived(
 }
 
 void RenderViewDevToolsAgentHost::DidAttachInterstitialPage() {
+  overrides_handler_->DidAttachInterstitialPage();
+
   if (!render_view_host_)
     return;
   // The rvh set in AboutToNavigateRenderView turned out to be interstitial.
@@ -331,6 +333,10 @@ void RenderViewDevToolsAgentHost::DidAttachInterstitialPage() {
   ConnectRenderViewHost(web_contents->GetRenderViewHost());
 }
 
+void RenderViewDevToolsAgentHost::DidDetachInterstitialPage() {
+  overrides_handler_->DidDetachInterstitialPage();
+}
+
 void RenderViewDevToolsAgentHost::Observe(int type,
                                           const NotificationSource& source,
                                           const NotificationDetails& details) {