Reduce the fullscreen window height by 1px on activation loss.

ui/platform_window/win/win_window.cc

 // Copyright 2014 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 "ui/platform_window/win/win_window.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
@@ skipping 56 matching lines @@
 
 void WinWindow::Close() {
   Destroy();
 }
 
 void WinWindow::SetBounds(const gfx::Rect& bounds) {
   gfx::Rect window_bounds = GetWindowBoundsForClientBounds(
       GetWindowLong(hwnd(), GWL_STYLE),
       GetWindowLong(hwnd(), GWL_EXSTYLE),
       bounds);
+  unsigned int flags = SWP_NOREPOSITION;
+  if (!::IsWindowVisible(hwnd()))
+    flags |= SWP_NOACTIVATE;
   SetWindowPos(hwnd(), NULL, window_bounds.x(), window_bounds.y(),
-               window_bounds.width(), window_bounds.height(),
-               SWP_NOREPOSITION);
+               window_bounds.width(), window_bounds.height(), flags);
 }
 
 gfx::Rect WinWindow::GetBounds() {
   RECT cr;
   GetClientRect(hwnd(), &cr);
   return gfx::Rect(cr);
 }
 
 void WinWindow::SetTitle(const base::string16& title) {
   SetWindowText(hwnd(), title.c_str());
@@ skipping 99 matching lines @@
 
 namespace test {
 
 // static
 void SetUsePopupAsRootWindowForTest(bool use) {
   use_popup_as_root_window_for_test = use;
 }
 
 }  // namespace test
 }  // namespace ui