[Sync] Componentize synced_tab_delegate

components/sync_sessions/synced_tab_delegate.h

Index: components/sync_sessions/synced_tab_delegate.h
diff --git a/components/sync_sessions/synced_tab_delegate.h b/components/sync_sessions/synced_tab_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..2745842fc4085b23a8a1e92f0eb808a40c93bf9a
--- /dev/null
+++ b/components/sync_sessions/synced_tab_delegate.h
@@ -0,0 +1,73 @@
+// 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.
+
+#ifndef COMPONENTS_SYNC_SESSIONS_SYNCED_TAB_DELEGATE_H__
+#define COMPONENTS_SYNC_SESSIONS_SYNCED_TAB_DELEGATE_H__
+
+#include <string>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "components/sessions/core/serialized_navigation_entry.h"
+#include "components/sessions/core/session_id.h"
+#include "ui/base/page_transition_types.h"
+#include "url/gurl.h"
+
+class Profile;
+
+namespace sync_sessions {
+class SyncSessionsClient;
+}
+
+namespace browser_sync {
+
+// A SyncedTabDelegate is used to insulate the sync code from depending
+// directly on WebContents, NavigationController, and the extensions TabHelper.
+class SyncedTabDelegate {
+ public:
+  virtual ~SyncedTabDelegate();
+
+  // Methods from TabContents.
+  virtual SessionID::id_type GetWindowId() const = 0;
+  virtual SessionID::id_type GetSessionId() const = 0;
+  virtual bool IsBeingDestroyed() const = 0;
+
+  // Method derived from extensions TabHelper.
+  virtual std::string GetExtensionAppId() const = 0;
+
+  // Methods from NavigationController.
+  virtual bool IsInitialBlankNavigation() const = 0;
+  virtual int GetCurrentEntryIndex() const = 0;
+  virtual int GetEntryCount() const = 0;
+  virtual GURL GetVirtualURLAtIndex(int i) const = 0;
+  virtual GURL GetFaviconURLAtIndex(int i) const = 0;
+  virtual ui::PageTransition GetTransitionAtIndex(int i) const = 0;
+  virtual void GetSerializedNavigationAtIndex(
+      int i,
+      sessions::SerializedNavigationEntry* serialized_entry) const = 0;
+
+  // Supervised user related methods.
+  virtual bool ProfileIsSupervised() const = 0;
+  virtual const std::vector<const sessions::SerializedNavigationEntry*>*
+  GetBlockedNavigations() const = 0;
+
+  // Session sync related methods.
+  virtual int GetSyncId() const = 0;
+  virtual void SetSyncId(int sync_id) = 0;
+  virtual bool ShouldSync(
+      sync_sessions::SyncSessionsClient* sessions_client) = 0;
+
+  // Whether this tab is a placeholder tab. On some platforms, tabs can be
+  // restored without bringing all their state into memory, and are just
+  // restored as a placeholder. In that case, the previous synced data from that
+  // tab should be preserved.
+  virtual bool IsPlaceholderTab() const = 0;
+
+ protected:
+  SyncedTabDelegate();
+};
+
+}  // namespace browser_sync
+
+#endif  // COMPONENTS_SYNC_SESSIONS_SYNCED_TAB_DELEGATE_H__