Record data: URL metrics for mime types that can run JavaScript.

chrome/browser/tab_contents/navigation_metrics_recorder.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.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_METRICS_RECORDER_H_
 #define CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_METRICS_RECORDER_H_
 
 #include "base/macros.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace rappor {
 class RapporServiceImpl;
 }
 
 class NavigationMetricsRecorder
     : public content::WebContentsObserver,
       public content::WebContentsUserData<NavigationMetricsRecorder> {
  public:
   ~NavigationMetricsRecorder() override;
 
   void set_rappor_service_for_testing(
       rappor::RapporServiceImpl* rappor_service);
 
+  // This enum is used in building a histogram. So, this is append only,
+  // any new scheme should be added at the end, before MIME_TYPE_MAX.
+  enum MimeType {
+    MIME_TYPE_OTHER,
+    MIME_TYPE_HTML,
+    MIME_TYPE_XHTML,
+    MIME_TYPE_PDF,
+    MIME_TYPE_SVG,
+    MIME_TYPE_MAX
+  };
+
  private:
   explicit NavigationMetricsRecorder(content::WebContents* web_contents);
   friend class content::WebContentsUserData<NavigationMetricsRecorder>;
 
   // content::WebContentsObserver overrides:
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
 
   rappor::RapporServiceImpl* rappor_service_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationMetricsRecorder);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_METRICS_RECORDER_H_