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

chrome/renderer/safe_browsing/threat_dom_details.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // ThreatDOMDetails iterates over a document's frames and gathers
 // interesting URLs such as those of scripts and frames. When done, it sends
 // them to the ThreatDetails that requested them.
 
 #ifndef CHROME_RENDERER_SAFE_BROWSING_THREAT_DOM_DETAILS_H_
 #define CHROME_RENDERER_SAFE_BROWSING_THREAT_DOM_DETAILS_H_
 
 #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:
   // An upper limit on the number of nodes we collect. Not const for the test.
   static uint32_t kMaxNodes;
 
   static ThreatDOMDetails* Create(content::RenderFrame* render_frame);
   ~ThreatDOMDetails() override;
 
   // Begins extracting resource urls for the page currently loaded in
   // this object's RenderFrame.
   // Exposed for testing.
   void ExtractResources(
       std::vector<SafeBrowsingHostMsg_ThreatDOMDetails_Node>* resources);
 
  private:
   // Creates a ThreatDOMDetails for the specified RenderFrame.
   // The ThreatDOMDetails should be destroyed prior to destroying
   // the RenderFrame.
   explicit ThreatDOMDetails(content::RenderFrame* render_frame);
 
   // RenderFrameObserver implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
   void OnDestruct() override;
 
   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);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_RENDERER_SAFE_BROWSING_THREAT_DOM_DETAILS_H_