API proposal for chrome.app.window to intercept all keys.

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index acbef2b60820a32f2e22a45f852d0d75eb59f666..879f3eed07415fb4a12d92ee5d4f76c628afa3df 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -28,6 +28,7 @@
 #include "ui/views/ime/input_method_bridge.h"
 #include "ui/views/widget/desktop_aura/desktop_cursor_loader_updater.h"
 #include "ui/views/widget/desktop_aura/desktop_drag_drop_client_win.h"
+#include "ui/views/widget/desktop_aura/desktop_keyboard_capture_win.h"
 #include "ui/views/widget/desktop_aura/desktop_native_cursor_manager.h"
 #include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 #include "ui/views/widget/root_view.h"
@@ -328,6 +329,17 @@ void DesktopWindowTreeHostWin::SetAlwaysOnTop(bool always_on_top) {
   message_handler_->SetAlwaysOnTop(always_on_top);
 }
 
+void DesktopWindowTreeHostWin::SetInterceptAllKeys(bool want_all_keys) {
+  if ((keyboard_capture_.get() == NULL) && want_all_keys) {
+    scoped_ptr<DesktopKeyboardCaptureWin> keyboard_capture(
+        new DesktopKeyboardCaptureWin(GetHWND()));
+    if (keyboard_capture->Capture())
+      keyboard_capture_.swap(keyboard_capture);
+  } else if (!want_all_keys) {
+    keyboard_capture_.reset(NULL);
+  }
+}
+
 bool DesktopWindowTreeHostWin::IsAlwaysOnTop() const {
   return message_handler_->IsAlwaysOnTop();
 }