Make session restore forced tab load delay Finch configurable, and separate first tab loads from su…

chrome/browser/sessions/tab_loader_delegate.h

 // Copyright 2014 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 CHROME_BROWSER_SESSIONS_TAB_LOADER_DELEGATE_H_
 #define CHROME_BROWSER_SESSIONS_TAB_LOADER_DELEGATE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 class TabLoaderCallback {
  public:
   // This function will get called to suppress and to allow tab loading. Tab
   // loading is initially enabled.
   virtual void SetTabLoadingEnabled(bool enable_tab_loading) = 0;
 };
 
 // TabLoaderDelegate is created once the SessionRestore process is complete and
 // the loading of hidden tabs starts.
 class TabLoaderDelegate {
  public:
   TabLoaderDelegate() {}
   virtual ~TabLoaderDelegate() {}
 
   // Create a tab loader delegate. |TabLoaderCallback::SetTabLoadingEnabled| can
   // get called to disable / enable tab loading.
   // The callback object is valid as long as this object exists.
   static scoped_ptr<TabLoaderDelegate> Create(TabLoaderCallback* callback);
 
+  // Returns the default timeout time after which the first non-visible tab
+  // gets loaded if the first (visible) tab did not finish loading.
+  virtual base::TimeDelta GetFirstTabLoadingTimeout() const = 0;
+
   // Returns the default timeout time after which the next tab gets loaded if
-  // the previous tab did not finish to load.
+  // the previous tab did not finish loading.
   virtual base::TimeDelta GetTimeoutBeforeLoadingNextTab() const = 0;
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_TAB_LOADER_DELEGATE_H_