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

chrome/browser/ui/browser_window.h

Index: chrome/browser/ui/browser_window.h
diff --git a/chrome/browser/ui/browser_window.h b/chrome/browser/ui/browser_window.h
index 680c8dfbb3d51ab224afbc1ec046e76d8373bf1d..41b321d71400e6a03284c6701976cf91bee641d7 100644
--- a/chrome/browser/ui/browser_window.h
+++ b/chrome/browser/ui/browser_window.h
@@ -133,6 +133,11 @@ class BrowserWindow {
   // Returns true if the frame is minimized.
   virtual bool IsMinimized() const = 0;
 
+  // Maximizes/minimizes/restores the window.
+  virtual void Maximize() = 0;
+  virtual void Minimize() = 0;
+  virtual void Restore() = 0;
+
   // Accessors for fullscreen mode state.
   virtual void EnterFullscreen(const GURL& url,
                                FullscreenExitBubbleType bubble_type) = 0;