Add a minimal Security panel to DevTools (behind a hidden experiment).

Source/devtools/devtools.gypi

Index: Source/devtools/devtools.gypi
diff --git a/Source/devtools/devtools.gypi b/Source/devtools/devtools.gypi
index 236095c58a594d95097fd7eb48125054e10ad689..98df348078b8dd66f1078d319bd57d8b034879f2 100644
--- a/Source/devtools/devtools.gypi
+++ b/Source/devtools/devtools.gypi
@@ -153,6 +153,7 @@
             'front_end/sdk/ResourceTreeModel.js',
             'front_end/sdk/RuntimeModel.js',
             'front_end/sdk/Script.js',
+            'front_end/sdk/SecurityManager.js',
             'front_end/sdk/ServiceWorkerManager.js',
             'front_end/sdk/SourceMap.js',
             'front_end/sdk/Target.js',
@@ -315,6 +316,7 @@
             'front_end/profiler/module.json',
             'front_end/promises/module.json',
             'front_end/resources/module.json',
+            'front_end/security/module.json',
             'front_end/screencast/module.json',
             'front_end/script_formatter_worker/module.json',
             'front_end/sdk/module.json',
@@ -510,6 +512,10 @@
             'front_end/resources/ServiceWorkerCacheViews.js',
             'front_end/resources/ServiceWorkersView.js',
         ],
+        'devtools_security_js_files': [
+            'front_end/security/securityPanel.css',
+            'front_end/security/SecurityPanel.js',
+        ],
         'devtools_script_formatter_worker_js_files': [
             'front_end/acorn/acorn.js',
             'front_end/cm/css.js',
@@ -676,6 +682,7 @@
             '<@(devtools_profiler_js_files)',
             '<@(devtools_promises_js_files)',
             '<@(devtools_resources_js_files)',
+            '<@(devtools_security_js_files)',
             '<@(devtools_screencast_js_files)',
             '<@(devtools_script_formatter_worker_js_files)',
             '<@(devtools_settings_js_files)',
@@ -738,6 +745,14 @@
             'front_end/Images/responsiveDesign_2x.png',
             'front_end/Images/searchNext.png',
             'front_end/Images/searchPrev.png',
+            'front_end/Images/securityStateHttp_2x.png',
+            'front_end/Images/securityStateHttp.png',
+            'front_end/Images/securityStateInsecure_2x.png',
+            'front_end/Images/securityStateInsecure.png',
+            'front_end/Images/securityStateSecure_2x.png',
+            'front_end/Images/securityStateSecure.png',
+            'front_end/Images/securityStateWarning_2x.png',
+            'front_end/Images/securityStateWarning.png',
             'front_end/Images/serviceWorker.svg',
             'front_end/Images/sessionStorage.png',
             'front_end/Images/settingsListRemove.png',