Multi-tab selection for Linux.

chrome/browser/tabs/tab_strip_model_observer.h

Index: chrome/browser/tabs/tab_strip_model_observer.h
diff --git a/chrome/browser/tabs/tab_strip_model_observer.h b/chrome/browser/tabs/tab_strip_model_observer.h
index 290d7700c87e506128313b0009e96ecee1c71663..54f4ea6adf3eae4e0909b06eafbaced662007e15 100644
--- a/chrome/browser/tabs/tab_strip_model_observer.h
+++ b/chrome/browser/tabs/tab_strip_model_observer.h
@@ -6,6 +6,8 @@
 #define CHROME_BROWSER_TABS_TAB_STRIP_MODEL_OBSERVER_H_
 #pragma once
 
+#include <vector>
+
 class TabContentsWrapper;
 class TabStripModel;
 
@@ -71,14 +73,17 @@ class TabStripModelObserver {
   // differs from |new_contents|. |user_gesture| specifies whether or not this
   // was done by a user input event (e.g. clicking on a tab, keystroke) or as a
   // side-effect of some other function.
-  //
-  // TODO(dpapad): Add TabSelectionChanged method for when the selected tabs
-  // change.
   virtual void ActiveTabChanged(TabContentsWrapper* old_contents,
                                 TabContentsWrapper* new_contents,
                                 int index,
                                 bool user_gesture);
 
+  // Sent when the selection changes. |previously_selected| and
+  // |currently_selected| contain the indices of the tabs that were previously
+  // and currently selected respectively.
+  virtual void TabSelectionChanged(const std::vector<int>& previously_selected,
+                                   const std::vector<int>& currently_selected);
+
   // The specified TabContents at |from_index| was moved to |to_index|.
   virtual void TabMoved(TabContentsWrapper* contents,
                         int from_index,