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 138c9291926d121c394666bdd4f3ddfd7fb7e0a8..82628c0df052c8e96f7b5395e3789aeb8200604b 100644
--- a/chrome/browser/ui/views/frame/browser_frame_aura.cc
+++ b/chrome/browser/ui/views/frame/browser_frame_aura.cc
@@ -229,6 +229,11 @@ 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()->is_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