Preload Instant search when omnibox is focused.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index ef672400a120eff6c8da619ce6082b3db266272b..8eb172e8dba5a1e7dfb35e12d3f9d3de6305631b 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -781,6 +781,11 @@ const char kParentProfile[]                 = "parent-profile";
 // renderer process rather than in a separate plugin process.
 const char kPpapiFlashInProcess[]          = "ppapi-flash-in-process";
 
+// Aggressively preload the default search engine's Instant URL, so it's ready
+// to receive queries. Only has an effect if Instant is turned on (via "Enable
+// Instant for faster searching and browsing" in Preferences -> Basics).
+const char kPreloadInstantSearch[]          = "preload-instant-search";
+
 // Controls speculative prerendering of pages, and content prefetching.  Both
 // are dispatched from <link rel=prefetch href=...> elements.
 const char kPrerender[]                     = "prerender";