WebView: choose loud vs. quiet interstitial

components/security_interstitials/content/security_interstitial_page.h

Index: components/security_interstitials/content/security_interstitial_page.h
diff --git a/components/security_interstitials/content/security_interstitial_page.h b/components/security_interstitials/content/security_interstitial_page.h
index 60fa290080f3e69d0a4d40432e752d79fe17dcbd..710945cada900db28ca7868293552a1f35a02bd9 100644
--- a/components/security_interstitials/content/security_interstitial_page.h
+++ b/components/security_interstitials/content/security_interstitial_page.h
@@ -53,6 +53,8 @@ class SecurityInterstitialPage : public content::InterstitialPageDelegate {
   // interstitial_page_ will now have a value.
   virtual void AfterShow() {}
 
+  virtual int GetHTMLTemplateId();
+
   // InterstitialPageDelegate method:
   std::string GetHTMLContents() override;