Add support for client-side phishing detection for non-UMA users.

chrome/common/safe_browsing/csd.proto

Index: chrome/common/safe_browsing/csd.proto
diff --git a/chrome/common/safe_browsing/csd.proto b/chrome/common/safe_browsing/csd.proto
index 983b79c7baa59b73704aee53f292e8e2966fd350..b700326f4c285f43de99229a7f4ae6c8fa0d05f8 100644
--- a/chrome/common/safe_browsing/csd.proto
+++ b/chrome/common/safe_browsing/csd.proto
@@ -17,8 +17,13 @@ package safe_browsing;
 
 message ClientPhishingRequest {
   // URL that the client visited.  The CGI parameters are stripped by the
-  // client.
-  required string url = 1;
+  // client.  This field is ONLY set for UMA-enabled users.
+  optional string url = 1;
+
+  // A 5-byte SHA-256 hash prefix of the URL, in SafeBrowsing host sufffix/path
+  // prefix form with query parameters stripped (i.e. "www.example.com/1/2/").
+  // Unlike "url", this is sent for all users.
+  optional bytes suffix_prefix_hash = 10;
 
   // Score that was computed on the client.  Value is between 0.0 and 1.0.
   // The larger the value the more likely the url is phishing.