[Extensions Toolbar] Make the ExtensionToolbarModel icon count more stable

chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm

Index: chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
index 3970f9680416324f42a071a1067e8cabcdb95bad..9ede3a62d5ffa0a3c7ec803922a69cae71559a0e 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
@@ -152,6 +152,7 @@ class ToolbarActionsBarBridge : public ToolbarActionsBarDelegate {
 
  private:
   // ToolbarActionsBarDelegate:
+  bool IsReady() const override;
   void AddViewForAction(ToolbarActionViewController* action,
                         size_t index) override;
   void RemoveViewForAction(ToolbarActionViewController* action) override;
@@ -181,6 +182,12 @@ ToolbarActionsBarBridge::ToolbarActionsBarBridge(
 ToolbarActionsBarBridge::~ToolbarActionsBarBridge() {
 }
 
+bool ToolbarActionsBarBridge::IsReady() const {
+  // Unlike the ui/views implementation, the BrowserActionsController is ready
+  // to create views from the time of its construction.
+  return true;
+}
+
 void ToolbarActionsBarBridge::AddViewForAction(
     ToolbarActionViewController* action,
     size_t index) {