Hide cold mode idle time spellchecker behind a flag

third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5

Index: third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
diff --git a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5 b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
index 18cde98be8ea06eea453e22b3f499608283d8e23..e3bbf4dd04f8fc71d263ce81b09ec03fe466a035 100644
--- a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
+++ b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
@@ -494,6 +494,11 @@
       status: "experimental",
     },
     {
+      name: "IdleTimeColdModeSpellChecking",

[yosin_UTC9, 2017/04/20 01:10:45]

Is it better to have a comment that IdleTimeColdModeSpeillChecking will work if
IdleTimeSpellChecking enabled?

[Xiaocheng, 2017/04/20 01:40:09]

I think there's no need to add a comment that says the same thing as the code...

+      depends_on: ["IdleTimeSpellChecking"],
+      status: "test",
+    },
+    {
       name: "IdleTimeSpellChecking",
       status: "test",
     },