[SYNC] Refactor SyncSourceInfo and add support in chrome invalidation client ...

chrome/browser/sync/engine/syncer_thread.h

Index: chrome/browser/sync/engine/syncer_thread.h
===================================================================
--- chrome/browser/sync/engine/syncer_thread.h	(revision 71061)
+++ chrome/browser/sync/engine/syncer_thread.h	(working copy)
@@ -49,6 +49,9 @@
   FRIEND_TEST_ALL_PREFIXES(SyncerThreadWithSyncerTest, NudgeWithDataTypes);
   FRIEND_TEST_ALL_PREFIXES(SyncerThreadWithSyncerTest,
                            NudgeWithDataTypesCoalesced);
+  FRIEND_TEST_ALL_PREFIXES(SyncerThreadWithSyncerTest, NudgeWithPayloads);
+  FRIEND_TEST_ALL_PREFIXES(SyncerThreadWithSyncerTest,
+                           NudgeWithPayloadsCoalesced);
   FRIEND_TEST_ALL_PREFIXES(SyncerThreadWithSyncerTest, Throttling);
   FRIEND_TEST_ALL_PREFIXES(SyncerThreadWithSyncerTest, AuthInvalid);
   FRIEND_TEST_ALL_PREFIXES(SyncerThreadWithSyncerTest, Pause);
@@ -140,6 +143,12 @@
       NudgeSource source,
       const syncable::ModelTypeBitSet& model_type);
 
+  virtual void NudgeSyncerWithPayloads(
+      int milliseconds_from_now,
+      NudgeSource source,
+      const std::vector<std::string>& payloads);
+
+
   void SetNotificationsEnabled(bool notifications_enabled);
 
   // Call this when a directory is opened
@@ -193,6 +202,11 @@
     // (can be union of various bitsets when multiple nudges are coalesced)
     syncable::ModelTypeBitSet pending_nudge_types_;
 
+    // Payloads associated with each of the datatypes we're polling on.
+    // These payloads are used by the download updates command and can contain
+    // datatype specific information the server might use.
+    std::vector<std::string> datatype_payloads_;
+
     // null iff there is no pending nudge.
     base::TimeTicks pending_nudge_time_;
 
@@ -281,6 +295,7 @@
       bool nudged,
       NudgeSource nudge_source,
       const syncable::ModelTypeBitSet& nudge_types,
+      const std::vector<std::string>& payloads,
       bool* initial_sync);
 
   int UserIdleTime();
@@ -327,7 +342,8 @@
   void NudgeSyncImpl(
       int milliseconds_from_now,
       NudgeSource source,
-      const syncable::ModelTypeBitSet& model_types);
+      const syncable::ModelTypeBitSet& model_types,
+      const std::vector<std::string>& payloads);
 
 #if defined(OS_LINUX)
   // On Linux, we need this information in order to query idle time.