Added new adaptive "Suggest" tab on the New Tab Page, behing the flag, for the experiments.

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 8797b1e5be04a5a8c71773e7dfeb023eb619dfc8..8f54676e844768925e562bacdd08b631e67a364f 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -554,6 +554,9 @@ const char kEnableRestoreSessionState[]   = "enable-restore-session-state";
 // supported server-side for searches on google.com.
 const char kEnableSdch[]                    = "enable-sdch";
 
+// Enables experimental suggestions pane in New Tab page.
+const char kEnableSuggestionsTabPage[]      = "enable-suggestions-ntp";
+
 // Enables syncing extension settings.
 const char kEnableSyncExtensionSettings[]   = "enable-sync-extension-settings";