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

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index 66439dfccb72266609ee0ecbcf25162694b10973..ed4fe73202d38d988236f4307d873eeb8be629af 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -15,6 +15,7 @@
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_type.h"
 #include "content/public/common/media_stream_request.h"
+#include "content/public/common/security_style.h"
 #include "content/public/common/window_container_type.h"
 #include "third_party/WebKit/public/platform/WebDisplayMode.h"
 #include "third_party/WebKit/public/web/WebDragOperation.h"
@@ -485,6 +486,10 @@ class CONTENT_EXPORT WebContentsDelegate {
   // default behavior is suppressed.
   virtual bool SaveFrame(const GURL& url, const Referrer& referrer);
 
+  // Can be overridden by a delegate to return the security style of the given
+  // web contents. Returns SECURITY_STYLE_UNKNOWN if not overriden.
+  virtual SecurityStyle GetSecurityStyle(const WebContents* web_contents);
+
  protected:
   virtual ~WebContentsDelegate();