DevTools: Set inactive class if devtools starts without focus

third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js

Index: third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js b/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
index 26d1f9722401173afde4f39aa30ee34481e25230..66d61ac971923f8b646837771dbf9a96e81d5f93 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
@@ -1110,6 +1110,7 @@ UI.LongClickController = class extends Common.Object {
  * @param {!Common.Setting} themeSetting
  */
 UI.initializeUIUtils = function(document, themeSetting) {
+  document.body.classList.toggle('inactive', !document.hasFocus());
   document.defaultView.addEventListener('focus', UI._windowFocused.bind(UI, document), false);
   document.defaultView.addEventListener('blur', UI._windowBlurred.bind(UI, document), false);
   document.addEventListener('focus', UI._focusChanged.bind(UI), true);