Add a SafeSearch preference, policy and implementation.

chrome/browser/google/google_util.h

Index: chrome/browser/google/google_util.h
diff --git a/chrome/browser/google/google_util.h b/chrome/browser/google/google_util.h
index b398bfac8242d7c8d3174693ed976632a7632553..6a0074d92675fdae983c03b0c9ce8c0b961a896a 100644
--- a/chrome/browser/google/google_util.h
+++ b/chrome/browser/google/google_util.h
@@ -95,6 +95,9 @@ bool IsOrganicFirstRun(const std::string& brand);
 // True if |brand| is an internet cafe brand code.
 bool IsInternetCafeBrandCode(const std::string& brand);
 
+// True if SafeSearch parameters should be added to the URL.
+bool SupportsSafeSearch(const std::string& url);
+
 // This class is meant to be used only from test code, and sets the brand
 // code returned by the function GetBrand() above while the object exists.
 class BrandForTesting {