Aura: Support hovering restore & close buttons for full screen apps

chrome/browser/ui/views/frame/browser_frame_aura.cc

Index: chrome/browser/ui/views/frame/browser_frame_aura.cc
diff --git a/chrome/browser/ui/views/frame/browser_frame_aura.cc b/chrome/browser/ui/views/frame/browser_frame_aura.cc
index 9bd0f848f122f718d23ba9028dcf7211627acb60..e18fce070fcc0b8abd2050c634a3f36ca57874bb 100644
--- a/chrome/browser/ui/views/frame/browser_frame_aura.cc
+++ b/chrome/browser/ui/views/frame/browser_frame_aura.cc
@@ -229,6 +229,12 @@ class BrowserFrameAura::WindowPropertyWatcher : public aura::WindowObserver {
     if (key != aura::client::kShowStateKey)
       return;
 
+    // Allow the frame to be replaced when maximizing an app.
+    if (browser_frame_->non_client_view() &&
+        browser_frame_aura_->browser_view()->browser()->type() ==
+            Browser::TYPE_APP)
+      browser_frame_->non_client_view()->UpdateFrame();
+
     // When migrating from regular ChromeOS to Aura, windows can have saved
     // restore bounds that are exactly equal to the maximized bounds.  Thus when
     // you hit maximize, there is no resize and the layout doesn't get