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

chrome/test/base/test_browser_window.h

Index: chrome/test/base/test_browser_window.h
diff --git a/chrome/test/base/test_browser_window.h b/chrome/test/base/test_browser_window.h
index 787c6f8004a2ab432d06c2565613cf2a4ad16191..2708ff92276d932cc767b639330920d47a399e98 100644
--- a/chrome/test/base/test_browser_window.h
+++ b/chrome/test/base/test_browser_window.h
@@ -43,6 +43,9 @@ class TestBrowserWindow : public BrowserWindow {
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual bool IsMaximized() const OVERRIDE;
   virtual bool IsMinimized() const OVERRIDE;
+  virtual void Maximize() OVERRIDE {}
+  virtual void Minimize() OVERRIDE {}
+  virtual void Restore() OVERRIDE {}
   virtual void EnterFullscreen(
       const GURL& url, FullscreenExitBubbleType type) OVERRIDE {}
   virtual void ExitFullscreen() OVERRIDE {}