Make extensions that desire to act pop out if in overflow

chrome/browser/extensions/extension_toolbar_model.h

Index: chrome/browser/extensions/extension_toolbar_model.h
diff --git a/chrome/browser/extensions/extension_toolbar_model.h b/chrome/browser/extensions/extension_toolbar_model.h
index 950366e7768daa6bb3cbb5b9f9d845ef54b30d6e..088171bd0818fc382540ef6bf184cb2b5d39134e 100644
--- a/chrome/browser/extensions/extension_toolbar_model.h
+++ b/chrome/browser/extensions/extension_toolbar_model.h
@@ -78,6 +78,12 @@ class ExtensionToolbarModel : public content::NotificationObserver,
     //   with the new set (and just assume the new set is different).
     virtual void ToolbarHighlightModeChanged(bool is_highlighting) = 0;
 
+    // Signal that the toolbar needs to be reordered for the given
+    // |web_contents|. This is caused by an overflowed action wanting to run,
+    // and needing to "pop itself out".
+    virtual void ToolbarReorderNecessary(
+        content::WebContents* web_contents) = 0;
+
     // Returns the browser associated with the Observer.
     virtual Browser* GetBrowser() = 0;
 
@@ -103,6 +109,12 @@ class ExtensionToolbarModel : public content::NotificationObserver,
   // As above, a return value of -1 represents "show all actions".
   int GetVisibleIconCount() const { return visible_icon_count_; }
 
+  // Returns the number of visible icons as an absolute value.
+  size_t GetAbsoluteVisibleIconCount() const {
+    return visible_icon_count_ == -1 ?
+        toolbar_items().size() : static_cast<size_t>(visible_icon_count_);
+  }
+
   bool extensions_initialized() const { return extensions_initialized_; }
 
   const ExtensionList& toolbar_items() const {
@@ -113,6 +125,17 @@ class ExtensionToolbarModel : public content::NotificationObserver,
 
   void OnExtensionToolbarPrefChange();
 
+  // Returns the item order for a given tab. This can be different from the
+  // base item order if the action wants to run on the given page, and needs to
+  // be popped out of overflow.
+  ExtensionList GetItemOrderForTab(content::WebContents* web_contents) const;
+
+  // Returns the visible icon count for a given tab. This can be different from
+  // the base item order if the action wants to run on the given page and needs
+  // to be popped out of overflow.
+  // A result of -1 indicates "all icons".
+  int GetVisibleIconCountForTab(content::WebContents* web_contents) const;
+
   // Finds the Observer associated with |browser| and tells it to display a
   // popup for the given |extension|. If |grant_active_tab| is true, this
   // grants active tab permissions to the |extension|; only do this because of