Add a new field trial for Instant.

chrome/browser/instant/instant_field_trial.h

Index: chrome/browser/instant/instant_field_trial.h
diff --git a/chrome/browser/instant/instant_field_trial.h b/chrome/browser/instant/instant_field_trial.h
index 52765d557055271a02dc9502e42a5de84f1577cf..5e2b3f8775853a821927190ae4d40e88b635d48c 100644
--- a/chrome/browser/instant/instant_field_trial.h
+++ b/chrome/browser/instant/instant_field_trial.h
@@ -28,11 +28,15 @@ class Profile;
 //
 // HIDDEN_EXPERIMENT: Queries are issued as the user types, but no preview is
 //     shown until they press <Enter>. If the user hasn't opted to send metrics
-//     (UMA) data, they are bounced back to INACTIVE.
+//     (UMA) data, they are bounced back to INACTIVE. Suggestions obtained from
+//     Instant are not propagated back to the omnibox.
 //
 // SILENT_EXPERIMENT: No queries are issued until the user presses <Enter>. No
 //     previews are shown. The user is not required to send metrics (UMA) data.
 //
+// SUGGEST_EXPERIMENT: Same as HIDDEN, except that the Instant suggestions are
+//     autocompleted inline into the omnibox.
+//
 // UMA_CONTROL: Instant is disabled. If the user hasn't opted to send metrics
 //     (UMA) data, they are bounced back to INACTIVE.
 //
@@ -51,13 +55,19 @@ class InstantFieldTrial {
 
     INSTANT_EXPERIMENT_A,
     INSTANT_EXPERIMENT_B,
+
     HIDDEN_EXPERIMENT_A,
     HIDDEN_EXPERIMENT_B,
+
     SILENT_EXPERIMENT_A,
     SILENT_EXPERIMENT_B,
 
+    SUGGEST_EXPERIMENT_A,
+    SUGGEST_EXPERIMENT_B,
+
     UMA_CONTROL_A,
     UMA_CONTROL_B,
+
     ALL_CONTROL_A,
     ALL_CONTROL_B,
   };
@@ -72,7 +82,7 @@ class InstantFieldTrial {
   // Check if the user is in any of the EXPERIMENT groups.
   static bool IsInstantExperiment(Profile* profile);
 
-  // Check if the user is in the HIDDEN or SILENT EXPERIMENT groups.
+  // Check if the user is in the HIDDEN, SILENT or SUGGEST EXPERIMENT groups.
   static bool IsHiddenExperiment(Profile* profile);
 
   // Check if the user is in the SILENT EXPERIMENT group.
@@ -85,6 +95,10 @@ class InstantFieldTrial {
  // Returns a string denoting the user's group, for adding as a URL param.
  static std::string GetGroupAsUrlParam(Profile* profile);
 
+ // Returns whether the Instant suggested text should be autocompleted inline
+ // into the omnibox.
+ static bool ShouldSetSuggestedText(Profile* profile);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(InstantFieldTrial);
 };