Minimized panels should not open on Windows when activated by the OS

chrome/browser/ui/panels/panel_window_controller_cocoa.mm

 // Copyright (c) 2012 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_window_controller_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
@@ skipping 61 matching lines @@
 
 
 @implementation PanelWindowControllerCocoa
 
 - (id)initWithBrowserWindow:(PanelBrowserWindowCocoa*)window {
   NSString* nibpath =
       [base::mac::FrameworkBundle() pathForResource:@"Panel" ofType:@"nib"];
   if ((self = [super initWithWindowNibPath:nibpath owner:self])) {
     windowShim_.reset(window);
     animateOnBoundsChange_ = YES;
+    canBecomeKeyWindow_ = YES;
   }
   contentsController_.reset(
       [[TabContentsController alloc] initWithContents:nil]);
   return self;
 }
 
 - (void)dealloc {
   if (windowTrackingArea_.get()) {
     [[[[self window] contentView] superview]
         removeTrackingArea:windowTrackingArea_.get()];
@@ skipping 524 matching lines @@
   BrowserWindow* browser_window =
       windowShim_->panel()->manager()->GetNextBrowserWindowToActivate(
           windowShim_->panel());
 
   if (browser_window)
     browser_window->Activate();
   else
     [NSApp deactivate];
 }
 
+- (void)preventBecomingKeyWindow:(BOOL)prevent {
+  canBecomeKeyWindow_ = !prevent;
+}
+
 - (void)fullScreenModeChanged:(bool)isFullScreen {
   NSWindow* window = [self window];
   [window setLevel:(isFullScreen ? NSNormalWindowLevel : NSStatusWindowLevel)];
 }
 
 - (BOOL)canBecomeKeyWindow {
   // Panel can only gain focus if it is expanded. Minimized panels do not
   // participate in Cmd-~ rotation.
   // TODO(dimich): If it will be ever desired to expand/focus the Panel on
   // keyboard navigation or via main menu, the care should be taken to avoid
   // cases when minimized Panel is getting keyboard input, invisibly.
-  return windowShim_->panel()->expansion_state() == Panel::EXPANDED;
+  return canBecomeKeyWindow_;
 }
 @end