Update ThreatDOMDetails to be able to collect non-resource HTML Elements based on their attributes.

chrome/renderer/safe_browsing/threat_dom_details.h

Index: chrome/renderer/safe_browsing/threat_dom_details.h
diff --git a/chrome/renderer/safe_browsing/threat_dom_details.h b/chrome/renderer/safe_browsing/threat_dom_details.h
index 2cab3d2814d21acaeea7592b57242b2fb2c562da..062229df917a664f74f8efbda36d503d316822da 100644
--- a/chrome/renderer/safe_browsing/threat_dom_details.h
+++ b/chrome/renderer/safe_browsing/threat_dom_details.h
@@ -12,12 +12,16 @@
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "base/feature_list.h"
 #include "content/public/renderer/render_frame_observer.h"
 
 struct SafeBrowsingHostMsg_ThreatDOMDetails_Node;
 
 namespace safe_browsing {
 
+extern const base::Feature kThreatDomDetailsTagAndAttributeFeature;
+extern const char kTagAndAttributeParamName[];
+
 // There is one ThreatDOMDetails per RenderFrame.
 class ThreatDOMDetails : public content::RenderFrameObserver {
  public: