[Sync] Add per-navigation timestamps/unique ids to tab sync.

chrome/browser/sync/glue/synced_session.cc

Index: chrome/browser/sync/glue/synced_session.cc
diff --git a/chrome/browser/sync/glue/synced_session.cc b/chrome/browser/sync/glue/synced_session.cc
index c25342aa4068bbd8da79f50a191fbc0bcfe8eba9..2cf92623c2519d58f3688dddde8548530996501d 100644
--- a/chrome/browser/sync/glue/synced_session.cc
+++ b/chrome/browser/sync/glue/synced_session.cc
@@ -5,11 +5,53 @@
 #include "chrome/browser/sync/glue/synced_session.h"
 
 #include "base/stl_util.h"
-#include "chrome/browser/sessions/session_types.h"
 #include "chrome/common/url_constants.h"
+#include "content/public/browser/navigation_entry.h"
 
 namespace browser_sync {
 
+SyncedTabNavigation::SyncedTabNavigation() : unique_id_(0) {
+}
+
+SyncedTabNavigation::SyncedTabNavigation(const SyncedTabNavigation& tab)
+    : unique_id_(tab.unique_id_),
+      timestamp_(tab.timestamp_) {
+}
+
+SyncedTabNavigation::SyncedTabNavigation(int index,
+                                         const GURL& virtual_url,
+                                         const content::Referrer& referrer,
+                                         const string16& title,
+                                         const std::string& state,
+                                         content::PageTransition transition,
+                                         int unique_id,
+                                         const base::Time& timestamp)
+    : TabNavigation(index, virtual_url, referrer, title, state, transition),
+      unique_id_(unique_id),
+      timestamp_(timestamp) {
+}
+
+SyncedTabNavigation::~SyncedTabNavigation() {
+}
+
+void SyncedTabNavigation::set_unique_id(int unique_id) {
+  unique_id_ = unique_id;
+}
+
+int SyncedTabNavigation::unique_id() const {
+  return unique_id_;
+}
+
+void SyncedTabNavigation::set_timestamp(const base::Time& timestamp) {
+  timestamp_ = timestamp;
+}
+base::Time SyncedTabNavigation::timestamp() const {
+  return timestamp_;
+}
+
+SyncedSessionTab::SyncedSessionTab() {}
+SyncedSessionTab::~SyncedSessionTab() {}
+
 SyncedSession::SyncedSession() : session_tag("invalid"),
                                  device_type(TYPE_UNSET) {
 }