DevTools: introduce external service client (behind experiment).

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 cf8b62f16c05a35868bc9e124918d46a78606721..4cea6555e24c9f5182b3210ae5e716ea6e63d8fc 100644
--- a/third_party/WebKit/Source/devtools/front_end/main/Main.js
+++ b/third_party/WebKit/Source/devtools/front_end/main/Main.js
@@ -98,6 +98,7 @@ WebInspector.Main.prototype = {
         Runtime.experiments.register("timelineShowAllProcesses", "Show all processes on Timeline", true);
         Runtime.experiments.register("securityPanel", "Security panel");
         Runtime.experiments.register("sourceDiff", "Source diff");
+        Runtime.experiments.register("terminalInDrawer", "Terminal in drawer", true);
         Runtime.experiments.register("timelineFlowEvents", "Timeline flow events", true);
         Runtime.experiments.register("timelineInvalidationTracking", "Timeline invalidation tracking", true);
         Runtime.experiments.register("timelineRecordingPerspectives", "Timeline recording perspectives UI");