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

win8/metro_driver/chrome_app_view_ash.cc

Index: win8/metro_driver/chrome_app_view_ash.cc
diff --git a/win8/metro_driver/chrome_app_view_ash.cc b/win8/metro_driver/chrome_app_view_ash.cc
index 98e52b375f62aa33182906a991d8c84783cd0980..8bcc6dbdab67a56f657ee666f8e0a1b9967d9ba6 100644
--- a/win8/metro_driver/chrome_app_view_ash.cc
+++ b/win8/metro_driver/chrome_app_view_ash.cc
@@ -1280,18 +1280,23 @@ HRESULT ChromeAppViewAsh::OnCharacterReceived(
 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();
+    // 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());
+    }
+  } else {

[cpu_(ooo_6.6-7.5), 2014/09/04 19:13:21]

// On windows 7 we need to force a redraw after the window is restored.

[ananta, 2014/09/04 19:27:07]

Added a comment. We also pass in a bool in the IPC to indicate that the
window needs to be repainted.

     ui_channel_->Send(new MetroViewerHostMsg_WindowActivated());
   }
   return S_OK;