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

chrome/browser/sync/sessions/sync_session_context.h

Index: chrome/browser/sync/sessions/sync_session_context.h
diff --git a/chrome/browser/sync/sessions/sync_session_context.h b/chrome/browser/sync/sessions/sync_session_context.h
index fbd5c0d023d8029dd4a4af0e55f39d2401072c76..0e7a837fec23f9cc3fcd4e323da38e6c99973d75 100644
--- a/chrome/browser/sync/sessions/sync_session_context.h
+++ b/chrome/browser/sync/sessions/sync_session_context.h
@@ -19,9 +19,11 @@
 #define CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSION_CONTEXT_H_
 #pragma once
 
+#include <map>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/time.h"
 #include "chrome/browser/sync/engine/model_safe_worker.h"
 #include "chrome/browser/sync/engine/syncer_types.h"
 #include "chrome/browser/sync/sessions/debug_info_getter.h"
@@ -45,6 +47,8 @@ class ScopedSessionContextConflictResolver;
 struct SyncSessionSnapshot;
 class TestScopedSessionEventListener;
 
+typedef std::map<syncable::ModelType, base::TimeTicks> UnthrottleTimes;
+
 class SyncSessionContext {
  public:
   SyncSessionContext(ServerConnectionManager* connection_manager,
@@ -52,6 +56,9 @@ class SyncSessionContext {
                      ModelSafeWorkerRegistrar* model_safe_worker_registrar,
                      const std::vector<SyncEngineEventListener*>& listeners,
                      DebugInfoGetter* debug_info_getter);
+
+  // Empty constructor for unit tests.
+  SyncSessionContext();
   ~SyncSessionContext();
 
   ConflictResolver* resolver() { return resolver_; }
@@ -103,6 +110,9 @@ class SyncSessionContext {
                       OnSyncEngineEvent(event));
   }
 
+  virtual void AddUnthrottleTime(const syncable::ModelTypeSet& types,
+                                 const base::TimeTicks& time);
+
  private:
   // Rather than force clients to set and null-out various context members, we
   // extend our encapsulation boundary to scoped helpers that take care of this
@@ -147,6 +157,8 @@ class SyncSessionContext {
   // client behavior on server side.
   DebugInfoGetter* const debug_info_getter_;
 
+  UnthrottleTimes unthrottle_times_;
+
   DISALLOW_COPY_AND_ASSIGN(SyncSessionContext);
 };