Add sidebar views implementation using ExtensionSystem SidebarManager

chrome/browser/ui/extensions/extension_action_view_controller.cc

Index: chrome/browser/ui/extensions/extension_action_view_controller.cc
diff --git a/chrome/browser/ui/extensions/extension_action_view_controller.cc b/chrome/browser/ui/extensions/extension_action_view_controller.cc
index 984ed1eccf0e0895e05aea5865be079c24fefbd0..1f16b506005ebac0eb811e0395c398993279004e 100644
--- a/chrome/browser/ui/extensions/extension_action_view_controller.cc
+++ b/chrome/browser/ui/extensions/extension_action_view_controller.cc
@@ -350,6 +350,8 @@ bool ExtensionActionViewController::TriggerSidebarWithUrl(
   DCHECK(toolbar_actions_bar_);
   toolbar_actions_bar_->SetSidebarOwner(this);
 
+  platform_delegate_->ShowSidebar(sidebar_host_->host_contents());
+
   PressButtonWithSlideOutIfEnabled(
       base::Bind(&ExtensionActionViewController::PressButton,
                  weak_factory_.GetWeakPtr(), true));
@@ -390,6 +392,8 @@ void ExtensionActionViewController::HideSidebar() {
   if (!sidebar_host_)
     return;
 
+  platform_delegate_->HideSidebar();
+
   sidebar_host_.reset();
   if (toolbar_actions_bar_)
     toolbar_actions_bar_->SetSidebarOwner(nullptr);