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

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 9a8726f234da4bbeaa2b6cee05aacb6d9e02ebf5..24bbd89fc41e9c85f9892e83582536f4f3f3c962 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -257,6 +257,23 @@ bool BrowserWindowCocoa::IsMinimized() const {
   return [window() isMiniaturized];
 }
 
+void BrowserWindowCocoa::Maximize() {
+  // Zoom toggles so only call if not already maximized.
+  if (!IsMaximized())
+    [window() zoom:controller_];
+}
+
+void BrowserWindowCocoa::Minimize() {
+  [window() miniaturize:controller_];
+}
+
+void BrowserWindowCocoa::Restore() {
+  if (IsMaximized())
+    [window() zoom:controller_];  // Toggles zoom mode.
+  else if (IsMinimized())
+    [window() deminiaturize:controller_];
+}
+
 void BrowserWindowCocoa::EnterFullscreen(
       const GURL& url, FullscreenExitBubbleType bubble_type) {
   [controller_ enterFullscreenForURL:url