[Mac] Add cocoa implementation for sidebar extension action support

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.mm b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
index 515594d62ca41f120e0e80426625ac8ceb49b8b2..f1d1c176dd97e0c4b499b077b7c7c1bce2918bcd 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -16,6 +16,7 @@
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/extensions/extension_util.h"
+#include "chrome/browser/extensions/sidebar_container.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/fullscreen.h"
 #include "chrome/browser/profiles/profile.h"
@@ -316,6 +317,7 @@ void BrowserWindowCocoa::BookmarkBarStateChanged(
 void BrowserWindowCocoa::UpdateDevTools() {
   [controller_ updateDevToolsForContents:
       browser_->tab_strip_model()->GetActiveWebContents()];
+  UpdateSidebarForContents(nullptr);
 }
 
 void BrowserWindowCocoa::UpdateLoadingAnimations(bool should_animate) {
@@ -830,6 +832,14 @@ void BrowserWindowCocoa::ShowAvatarBubbleFromAvatarButton(
                          withServiceType:manage_accounts_params.service_type];
 }
 
+void BrowserWindowCocoa::UpdateSidebarForContents(
+  content::WebContents* sidebar_contents) {
+  WebContents* web_contents =
+      browser_->tab_strip_model()->GetActiveWebContents();
+  [controller_ updateSidebarForContents:web_contents
+                       sidebar_contents:sidebar_contents];
+}
+
 int
 BrowserWindowCocoa::GetRenderViewHeightInsetWithDetachedBookmarkBar() {
   if (browser_->bookmark_bar_state() != BookmarkBar::DETACHED)
@@ -865,3 +875,11 @@ void BrowserWindowCocoa::HideDownloadShelf() {
   if (statusBubble)
     statusBubble->Hide();
 }
+
+void BrowserWindowCocoa::ShowSidebar(content::WebContents* sidebar_contents) {
+  UpdateSidebarForContents(sidebar_contents);
+}
+
+void BrowserWindowCocoa::HideSidebar() {
+  UpdateSidebarForContents(nullptr);
+}