Make extensions that desire to act pop out if in overflow

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 4e91304d984bd5a5db803745d28ff5f043b782cd..60ed4dd2586272d4d5f67b726fc5e409d27c38df 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
@@ -246,6 +246,10 @@ class ExtensionServiceObserverBridge
 
   void ToolbarVisibleCountChanged() override {}
 
+  void ToolbarReorderNecessary(content::WebContents* web_contents) override {
+    // TODO(devlin): Implement on mac.
+  }
+
   void ToolbarHighlightModeChanged(bool is_highlighting) override {}
 
   Browser* GetBrowser() override { return browser_; }
@@ -353,9 +357,7 @@ class ExtensionServiceObserverBridge
 }
 
 - (void)resizeContainerAndAnimate:(BOOL)animate {
-  int iconCount = toolbarModel_->GetVisibleIconCount();
-  if (iconCount < 0)  // If no buttons are hidden.
-    iconCount = [self buttonCount];
+  int iconCount = toolbarModel_->GetAbsoluteVisibleIconCount();
 
   [containerView_ resizeToWidth:[self containerWidthWithButtonCount:iconCount]
                         animate:animate];
@@ -384,9 +386,8 @@ class ExtensionServiceObserverBridge
   if (!toolbarModel_)
     return 0;
 
-  int savedButtonCount = toolbarModel_->GetVisibleIconCount();
-  if (savedButtonCount < 0 ||  // all icons are visible
-      static_cast<NSUInteger>(savedButtonCount) > [self buttonCount])
+  int savedButtonCount = toolbarModel_->GetAbsoluteVisibleIconCount();
+  if (static_cast<NSUInteger>(savedButtonCount) > [self buttonCount])
     savedButtonCount = [self buttonCount];
   return [self containerWidthWithButtonCount:savedButtonCount];
 }