sync: Count and report reflected updates

sync/protocol/get_updates_caller_info.proto

Index: sync/protocol/get_updates_caller_info.proto
diff --git a/sync/protocol/get_updates_caller_info.proto b/sync/protocol/get_updates_caller_info.proto
new file mode 100644
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+++ b/sync/protocol/get_updates_caller_info.proto
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+option retain_unknown_fields = true;
+
+package sync_pb;
+
+message GetUpdatesCallerInfo {
+  enum GetUpdatesSource {
+    UNKNOWN = 0;  // The source was not set by the caller.
+    FIRST_UPDATE = 1;  // First request after browser restart.  Not to
+                       // be confused with "NEW_CLIENT".
+    LOCAL = 2;  // The source of the update was a local change.
+    NOTIFICATION = 3;  // The source of the update was a p2p notification.
+    PERIODIC = 4;  // The source of the update was periodic polling.
+    SYNC_CYCLE_CONTINUATION = 5;  // The source of the update was a
+                                  // continuation of a previous update.
+    CLEAR_PRIVATE_DATA = 6;       // Source is a call to remove all private data
+    NEWLY_SUPPORTED_DATATYPE = 7;   // The client is in configuration mode
+                                    // because it's syncing all datatypes, and
+                                    // support for a new datatype was recently
+                                    // released via a software auto-update.
+    MIGRATION = 8;         // The client is in configuration mode because a
+                           // MIGRATION_DONE error previously returned by the
+                           // server necessitated resynchronization.
+    NEW_CLIENT = 9;        // The client is in configuration mode because the
+                           // user enabled sync for the first time.  Not to be
+                           // confused with FIRST_UPDATE.
+    RECONFIGURATION = 10;  // The client is in configuration mode because the
+                           // user opted to sync a different set of datatypes.
+    DATATYPE_REFRESH = 11;    // A datatype has requested a refresh. This is
+                              // typically used when datatype's have custom
+                              // sync UI, e.g. sessions.
+  }
+
+  required GetUpdatesSource source = 1;
+
+  // True only if notifications were enabled for this GetUpdateMessage.
+  optional bool notifications_enabled = 2;
+};
+