Notify the Chrome browser process about the window being activated from the viewer process.

win8/metro_driver/chrome_app_view_ash.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 "win8/metro_driver/stdafx.h"
 #include "win8/metro_driver/chrome_app_view_ash.h"
 
 #include <corewindow.h>
 #include <shellapi.h>
 #include <windows.foundation.h>
@@ skipping 1262 matching lines @@
   ui_channel_->Send(new MetroViewerHostMsg_Character(char_code,
                                                      status.RepeatCount,
                                                      status.ScanCode,
                                                      GetKeyboardEventFlags()));
   return S_OK;
 }
 
 HRESULT ChromeAppViewAsh::OnWindowActivated(
     winui::Core::ICoreWindow* sender,
     winui::Core::IWindowActivatedEventArgs* args) {
-  winui::Core::CoreWindowActivationState state;
-  HRESULT hr = args->get_WindowActivationState(&state);
-  if (FAILED(hr))
-    return hr;
+  if (args) {
+    winui::Core::CoreWindowActivationState state;
+    HRESULT hr = args->get_WindowActivationState(&state);
+    if (FAILED(hr))
+      return hr;
 
-  // Treat both full activation (Ash was reopened from the Start Screen or from
-  // any other Metro entry point in Windows) and pointer activation (user
-  // clicked back in Ash after using another app on another monitor) the same.
-  if (state == winui::Core::CoreWindowActivationState_CodeActivated ||
-      state == winui::Core::CoreWindowActivationState_PointerActivated) {
-    if (text_service_)
-      text_service_->OnWindowActivated();
-    ui_channel_->Send(new MetroViewerHostMsg_WindowActivated());
+    // Treat both full activation (Ash was reopened from the Start Screen or
+    // from any other Metro entry point in Windows) and pointer activation
+    // (user clicked back in Ash after using another app on another monitor)
+    // the same.
+    if (state == winui::Core::CoreWindowActivationState_CodeActivated ||
+        state == winui::Core::CoreWindowActivationState_PointerActivated) {
+      if (text_service_)
+        text_service_->OnWindowActivated();
+      ui_channel_->Send(new MetroViewerHostMsg_WindowActivated(false));
+    }
+  } else {
+    // On Windows 7, we force a repaint when the window is activated.
+    ui_channel_->Send(new MetroViewerHostMsg_WindowActivated(true));
   }
   return S_OK;
 }
 
 HRESULT ChromeAppViewAsh::HandleSearchRequest(
     winapp::Activation::IActivatedEventArgs* args) {
   mswr::ComPtr<winapp::Activation::ISearchActivatedEventArgs> search_args;
   CheckHR(args->QueryInterface(
           winapp::Activation::IID_ISearchActivatedEventArgs, &search_args));
 
@@ skipping 84 matching lines @@
   mswr::ComPtr<winapp::Core::ICoreApplicationExit> app_exit;
   CheckHR(core_app.As(&app_exit));
   globals.app_exit = app_exit.Detach();
 }
 
 IFACEMETHODIMP
 ChromeAppViewFactory::CreateView(winapp::Core::IFrameworkView** view) {
   *view = mswr::Make<ChromeAppViewAsh>().Detach();
   return (*view) ? S_OK :  E_OUTOFMEMORY;
 }