[Sync] Parse and save per-data type throttle data

chrome/browser/sync/protocol/sync.proto

Index: chrome/browser/sync/protocol/sync.proto
diff --git a/chrome/browser/sync/protocol/sync.proto b/chrome/browser/sync/protocol/sync.proto
index b4e182618e4c2458ad8a31532ace5ce085b9a24b..f61ee31389ac9e4cc48d49eedeb171abd92d403d 100644
--- a/chrome/browser/sync/protocol/sync.proto
+++ b/chrome/browser/sync/protocol/sync.proto
@@ -420,7 +420,7 @@ message ClearUserDataResponse {
 
 message ClientToServerMessage {
   required string share = 1;
-  optional int32 protocol_version = 2 [default = 29];
+  optional int32 protocol_version = 2 [default = 30];
   enum Contents {
     COMMIT = 1;
     GET_UPDATES = 2;
@@ -627,7 +627,8 @@ message ClientToServerResponse {
     MIGRATION_DONE     = 9;   // Migration has finished for one or more data
                               // types.  Client should clear the cache for
                               // these data types only and then re-sync with
-                              // a server.
+                              // a server. The migrated datatypes would be

[akalin, 2011/11/21 22:36:04]

would be present -> are

[lipalani1, 2011/11/22 00:47:36]

Done.

+                              // present in the |migrated_datatype_ids| field.
     UNKNOWN            = 100; // Unknown value. This should never be explicitly
                               // used; it is the default value when an
                               // out-of-date client parses a value it doesn't
@@ -650,6 +651,10 @@ message ClientToServerResponse {
       UNKNOWN_ACTION              = 5; // This is the default.
     }
     optional Action action              = 4 [default = UNKNOWN_ACTION];
+
+    // Currently only meaningful if the |error_type| is throttled. If this field
+    // is absent then the whole client(all datatypes) is throttled.

[akalin, 2011/11/21 22:36:04]

space before '('

[lipalani1, 2011/11/22 00:47:36]

Done.

+    repeated int32 error_data_type_ids = 5;
   }
 
   optional Error error = 13;