Devtools UI: Enable tooltips by default

BUG=513066

Review URL: https://codereview.chromium.org/1257793005

git-svn-id: svn://svn.chromium.org/blink/trunk@200712 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/inspector/extensions/extensions-panel.html

@@ -38,7 +38,7 @@ function initialize_extensionsPanelTest()
             }
             // Strip url(...) and prefix of the URL within, leave just last 3 components.
             var url = item.style.backgroundImage.replace(/^url\(.*(([/][^/]*){3}[^/)]*)\)$/, "...$1");
-            InspectorTest.addResult("status bar item " + i + ", icon: " + url + ", tooltip: '" + item.title + "', disabled: " + item.disabled);
+            InspectorTest.addResult("status bar item " + i + ", icon: " + url + ", tooltip: '" + item[WebInspector.Tooltip._symbol].content + "', disabled: " + item.disabled);
        }
     }
 

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

@@ -148,7 +148,7 @@ WebInspector.Main.prototype = {
         Runtime.experiments.register("timelineInvalidationTracking", "Timeline invalidation tracking", true);
         Runtime.experiments.register("timelineTracingJSProfile", "Timeline tracing based JS profiler", true);
         Runtime.experiments.register("timelineFlowEvents", "Timeline flow events", true);
-        Runtime.experiments.register("tooltips", "Tooltips", true);
+        Runtime.experiments.register("tooltips", "Tooltips");
         Runtime.experiments.register("inlineVariableValues", "Display variable values inline while debugging");
 
         Runtime.experiments.cleanUpStaleExperiments();
@@ -170,7 +170,8 @@ WebInspector.Main.prototype = {
 
         Runtime.experiments.setDefaultExperiments([
             "inlineVariableValues",
-            "serviceWorkersInPageFrontend"
+            "serviceWorkersInPageFrontend",
+            "tooltips"
         ]);
     },