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..41230194bfc3ffc1f3b3e90a25d38f3eb41eef50 100644
--- a/chrome/renderer/safe_browsing/threat_dom_details.h
+++ b/chrome/renderer/safe_browsing/threat_dom_details.h
@@ -12,12 +12,29 @@
 #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[];
+
+// Represents the tag name of an HTML Element and its associated attributes.
+// Used to determine which elements to collect. Populated from the param value
+// of |kThreatDomDetailsTagAndAttributeFeature|.
+class TagAndAttributesItem {
+ public:
+  TagAndAttributesItem();
+  TagAndAttributesItem(const TagAndAttributesItem& item);
+  ~TagAndAttributesItem();
+
+  std::string tag_name;
+  std::vector<std::string> attributes;
+};
+
 // There is one ThreatDOMDetails per RenderFrame.
 class ThreatDOMDetails : public content::RenderFrameObserver {
  public:
@@ -45,6 +62,10 @@ class ThreatDOMDetails : public content::RenderFrameObserver {
 
   void OnGetThreatDOMDetails();
 
+  // A list of tag names and associates attributes, used to determine which
+  // elements need to be collected.
+  std::vector<TagAndAttributesItem> tag_and_attributes_list_;
+
   DISALLOW_COPY_AND_ASSIGN(ThreatDOMDetails);
 };