Add extension API to change window show state using chrome.windows.update().

chrome/browser/ui/panels/panel.cc

Index: chrome/browser/ui/panels/panel.cc
diff --git a/chrome/browser/ui/panels/panel.cc b/chrome/browser/ui/panels/panel.cc
index d965f6fc8e536b71c142b8543667cd97a6f02f7b..2dfafd18949a2ec7b94e33d8d451b154c1057ec2 100644
--- a/chrome/browser/ui/panels/panel.cc
+++ b/chrome/browser/ui/panels/panel.cc
@@ -256,6 +256,18 @@ bool Panel::IsMinimized() const {
   return expansion_state_ != EXPANDED;
 }
 
+void Panel::Maximize() {
+  Restore();
+}
+
+void Panel::Minimize() {
+  SetExpansionState(MINIMIZED);
+}
+
+void Panel::Restore() {
+  SetExpansionState(EXPANDED);
+}
+
 void Panel::EnterFullscreen(
       const GURL& url, FullscreenExitBubbleType type) {
   NOTIMPLEMENTED();