Make info button appear only when mouse is over the panel or the panel has focus.

chrome/browser/ui/panels/panel.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/panels/panel.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "ui/gfx/rect.h"
@@ skipping 60 matching lines @@
   // called to close a panel.
 #ifndef NDEBUG
   closing_ = true;
 #endif
 
   browser_window_->Close();
   manager()->Remove(this);
 }
 
 void Panel::Activate() {
-  NOTIMPLEMENTED();
+  browser_window_->Activate();
 }
 
 void Panel::Deactivate() {
-  NOTIMPLEMENTED();
+  browser_window_->Deactivate();
 }
 
 bool Panel::IsActive() const {
   return browser_window_->IsActive();
 }
 
 void Panel::FlashFrame() {
   NOTIMPLEMENTED();
 }
 
@@ skipping 281 matching lines @@
 
 #if defined(OS_CHROMEOS)
 void Panel::ShowKeyboardOverlay(gfx::NativeWindow owning_window) {
   NOTIMPLEMENTED();
 }
 #endif
 
 void Panel::DestroyBrowser() {
   NOTIMPLEMENTED();
 }