Introduce a field trial for Instant.

chrome/browser/autocomplete/autocomplete.h

Index: chrome/browser/autocomplete/autocomplete.h
diff --git a/chrome/browser/autocomplete/autocomplete.h b/chrome/browser/autocomplete/autocomplete.h
index ee73d692f52a2acae2e83a714c0be39391f7ce70..e7306dfe518681c27ee5bbe04dee2b328ace4b49 100644
--- a/chrome/browser/autocomplete/autocomplete.h
+++ b/chrome/browser/autocomplete/autocomplete.h
@@ -600,12 +600,14 @@ class AutocompleteController : public ACProviderListener {
   AutocompleteController(Profile* profile,
                          AutocompleteControllerDelegate* delegate);
 #ifdef UNIT_TEST
-  explicit AutocompleteController(const ACProviders& providers)
+  explicit AutocompleteController(const ACProviders& providers,

[sky, 2011/07/12 00:37:50]

no explicit

[sreeram, 2011/07/12 03:36:18]

Good catch! Will do in the next patch.

+                                  Profile* profile)
       : delegate_(NULL),
         providers_(providers),
         search_provider_(NULL),
         done_(true),
-        in_start_(false) {
+        in_start_(false),
+        profile_(profile) {
   }
 #endif
   ~AutocompleteController();
@@ -717,6 +719,8 @@ class AutocompleteController : public ACProviderListener {
   // notifications until Start() has been invoked on all providers.
   bool in_start_;
 
+  Profile* profile_;
+
   DISALLOW_COPY_AND_ASSIGN(AutocompleteController);
 };