Enable spare RenderProcessHost to be preinitialized.

chrome/browser/flag_descriptions.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 const char kAccelerated2dCanvasName[] = "Accelerated 2D canvas";
 const char kAccelerated2dCanvasDescription[] =
@@ skipping 3028 matching lines @@
     "In the event that the omnibox provides suggestions on-focus, the URL of "
     "the current page is provided as the first suggestion without a title. "
     "Enabling this flag causes the title to be displayed.";
 
 const char kOmniboxUIElideSuggestionUrlAfterHostName[] =
     "Omnibox UI Elide Suggestion URL After Host";
 const char kOmniboxUIElideSuggestionUrlAfterHostDescription[] =
     "Elides the path, query, and ref of suggested URLs in the Omnibox "
     "dropdown.";
 
+const char kOmniboxSpareRendererName[] =
+    "Start spare renderer on omnibox focus";
+const char kOmniboxSpareRendererDescription[] =
+    "When the omnibox is focused, start an empty spare renderer. This can "
+    "speed up the load of the navigation from the omnibox.";
+
 const char kOmniboxUIHideSuggestionUrlSchemeName[] =
     "Omnibox UI Hide Suggestion URL Scheme";
 const char kOmniboxUIHideSuggestionUrlSchemeDescription[] =
     "Elides the schemes of suggested URLs in the Omnibox dropdown.";
 
 const char kOmniboxUIHideSuggestionUrlTrivialSubdomainsName[] =
     "Omnibox UI Hide Suggestion URL Trivial Subdomains";
 const char kOmniboxUIHideSuggestionUrlTrivialSubdomainsDescription[] =
     "Elides trivially informative subdomains from suggested URLs in the "
     "Omnibox dropdown (e.g. www. and m.).";
@@ skipping 105 matching lines @@
 #if defined(OS_ANDROID)
 
 const char kSpannableInlineAutocompleteName[] = "Spannable inline autocomplete";
 const char kSpannableInlineAutocompleteDescription[] =
     "A new type of inline autocomplete for the omnibox that works with "
     "keyboards that compose text.";
 
 #endif  // defined(OS_ANDROID)
 
 }  // namespace flag_descriptions