Introduce browser-side plumbing for sending the lock icon status to DevTools.

chrome/browser/ssl/connection_security_helper.h

Index: chrome/browser/ssl/connection_security_helper.h
diff --git a/chrome/browser/ssl/connection_security_helper.h b/chrome/browser/ssl/connection_security_helper.h
index 3a34b567b977705b2b60567125bca354fa46b8d3..befba710b9a1e042faf1241e1a756700c823472a 100644
--- a/chrome/browser/ssl/connection_security_helper.h
+++ b/chrome/browser/ssl/connection_security_helper.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_SSL_CONNECTION_SECURITY_HELPER_H_
 
 #include "base/macros.h"
+#include "content/public/common/security_style.h"
 
 namespace content {
 class WebContents;
@@ -52,6 +53,17 @@ class ConnectionSecurityHelper {
   static SecurityLevel GetSecurityLevelForWebContents(
       const content::WebContents* web_contents);
 
+  // Returns the content::SecurityStyle for the given |web_contents|.
+  // Note: This is a lossy operation. Not all of the policies
+  // that can be expressed by a SecurityLevel (a //chrome concept) can
+  // be expressed by a content::SecurityStyle.
+  // In general, code in //chrome should prefer to use
+  // GetSecurityLevelForWebContents() to determine security policy, and
+  // only use this function when policy needs to be supplied back to
+  // layers in //content.
+  static content::SecurityStyle GetSecurityStyleForWebContents(
+      const content::WebContents* web_contents);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ConnectionSecurityHelper);
 };