DevTools: enable object previews experiment by default

third_party/WebKit/Source/devtools/front_end/main/Main.js

Index: third_party/WebKit/Source/devtools/front_end/main/Main.js
diff --git a/third_party/WebKit/Source/devtools/front_end/main/Main.js b/third_party/WebKit/Source/devtools/front_end/main/Main.js
index fa84f1af5efbff9679e73366fe2c76ec9c43e896..98a83d1599759f83b02843c24a5c6441227c0a01 100644
--- a/third_party/WebKit/Source/devtools/front_end/main/Main.js
+++ b/third_party/WebKit/Source/devtools/front_end/main/Main.js
@@ -138,7 +138,8 @@ Main.Main = class {
         Runtime.experiments.enableForTest('liveSASS');
     }
 
-    Runtime.experiments.setDefaultExperiments(['continueToLocationMarkers', 'autoAttachToCrossProcessSubframes']);
+    Runtime.experiments.setDefaultExperiments(
+        ['continueToLocationMarkers', 'autoAttachToCrossProcessSubframes', 'objectPreviews']);
   }
 
   /**