[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 71618)
+++ chrome/browser/sync/engine/syncer_thread.h	(working copy)
@@ -10,6 +10,7 @@
 #pragma once
 
 #include <list>
+#include <map>
 #include <string>
 #include <vector>
 
@@ -49,6 +50,9 @@
   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 +144,14 @@
       NudgeSource source,
       const syncable::ModelTypeBitSet& model_type);
 
+  // Same as |NudgeSyncer|, but supports including a payload for passing on to
+  // the download updates command. Datatypes with payloads are also considered
+  // to have caused a nudged to occur and treated accordingly.
+  virtual void NudgeSyncerWithPayloads(
+      int milliseconds_from_now,
+      NudgeSource source,
+      const std::map<syncable::ModelType, std::string>& payloads);
+
   void SetNotificationsEnabled(bool notifications_enabled);
 
   // Call this when a directory is opened
@@ -193,6 +205,11 @@
     // (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::map<syncable::ModelType, std::string> datatype_payloads_;
+
     // null iff there is no pending nudge.
     base::TimeTicks pending_nudge_time_;
 
@@ -281,6 +298,7 @@
       bool nudged,
       NudgeSource nudge_source,
       const syncable::ModelTypeBitSet& nudge_types,
+      const std::map<syncable::ModelType, std::string>& payloads,
       bool* initial_sync);
 
   int UserIdleTime();
@@ -327,7 +345,8 @@
   void NudgeSyncImpl(
       int milliseconds_from_now,
       NudgeSource source,
-      const syncable::ModelTypeBitSet& model_types);
+      const syncable::ModelTypeBitSet& model_types,
+      const std::map<syncable::ModelType, std::string>& payloads);
 
 #if defined(OS_LINUX)
   // On Linux, we need this information in order to query idle time.