Toggle avatar color when window activation changes.

chrome/browser/ui/views/frame/browser_non_client_frame_view.h

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view.h
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view.h b/chrome/browser/ui/views/frame/browser_non_client_frame_view.h
index 364c02a16958461fceecf4a83710365deff02211..47777c53626471230ae5848465b471ff860eea89 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view.h
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view.h
@@ -5,7 +5,9 @@
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_H_
 
+#include "base/scoped_observer.h"
 #include "chrome/browser/profiles/profile_attributes_storage.h"
+#include "ui/views/widget/widget_observer.h"
 #include "ui/views/window/non_client_view.h"
 
 class AvatarMenuButton;
@@ -15,6 +17,7 @@ class BrowserView;
 // A specialization of the NonClientFrameView object that provides additional
 // Browser-specific methods.
 class BrowserNonClientFrameView : public views::NonClientFrameView,
+                                  public views::WidgetObserver,
                                   public ProfileAttributesStorage::Observer {
  public:
   BrowserNonClientFrameView(BrowserFrame* frame, BrowserView* browser_view);
@@ -90,6 +93,10 @@ class BrowserNonClientFrameView : public views::NonClientFrameView,
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
+  // views::WidgetObserver:
+  void OnWidgetDestroyed(views::Widget* widget) override;
+  void OnWidgetActivationChanged(views::Widget* widget, bool active) override;
+
   // ProfileAttributesStorage::Observer:
   void OnProfileAdded(const base::FilePath& profile_path) override;
   void OnProfileWasRemoved(const base::FilePath& profile_path,
@@ -113,6 +120,8 @@ class BrowserNonClientFrameView : public views::NonClientFrameView,
   // styles. TODO(anthonyvd): simplify/rename.
   AvatarMenuButton* avatar_button_ = nullptr;
 
+  ScopedObserver<views::Widget, views::WidgetObserver> observer_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserNonClientFrameView);
 };