Clear the cached avatar button offset when the DPI scaling changes

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

 // 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/views/frame/browser_desktop_window_tree_host_win.h"
 
 #include <dwmapi.h>
 
 #include "base/macros.h"
 #include "base/process/process_handle.h"
@@ skipping 115 matching lines @@
   // Reinitialize the status bubble, since it needs to be initialized
   // differently depending on whether or not DWM composition is enabled
   browser_view_->InitStatusBubble();
 
   // We need to update the glass region on or off before the base class adjusts
   // the window region.
   UpdateDWMFrame();
   DesktopWindowTreeHostWin::HandleFrameChanged();
 }
 
+void BrowserDesktopWindowTreeHostWin::HandleWindowScaleFactorChanged(
+    float window_scale_factor) {
+  DesktopWindowTreeHostWin::HandleWindowScaleFactorChanged(window_scale_factor);
+  minimize_button_metrics_.OnDpiChanged();
+}
+
 bool BrowserDesktopWindowTreeHostWin::PreHandleMSG(UINT message,
                                                    WPARAM w_param,
                                                    LPARAM l_param,
                                                    LRESULT* result) {
   switch (message) {
     case WM_ACTIVATE:
       if (LOWORD(w_param) != WA_INACTIVE)
         minimize_button_metrics_.OnHWNDActivated();
       return false;
     case WM_ENDSESSION:
@@ skipping 193 matching lines @@
     BrowserDesktopWindowTreeHost::CreateBrowserDesktopWindowTreeHost(
         views::internal::NativeWidgetDelegate* native_widget_delegate,
         views::DesktopNativeWidgetAura* desktop_native_widget_aura,
         BrowserView* browser_view,
         BrowserFrame* browser_frame) {
   return new BrowserDesktopWindowTreeHostWin(native_widget_delegate,
                                              desktop_native_widget_aura,
                                              browser_view,
                                              browser_frame);
 }