views: Make ShouldUseVistaFrame a static method of WidgetWin.

Move it from hwnd_util.[cc,h] to widget_win.h and rename to IsAeroGlassEnabled.

BUG=70143
TEST=trybots

Review URL: http://codereview.chromium.org/6348019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72912 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 14 insertions, 0 deletions

diff --git a/views/widget/widget_win.cc b/views/widget/widget_win.cc
index 1fd9dbd..2f7603a 100644
--- a/views/widget/widget_win.cc
+++ b/views/widget/widget_win.cc
@@ -4,8 +4,11 @@
 
 #include "views/widget/widget_win.h"
 
+#include <dwmapi.h>
+
 #include "app/win/win_util.h"
 #include "base/string_util.h"
+#include "base/win/windows_version.h"
 #include "gfx/canvas_skia.h"
 #include "gfx/native_theme_win.h"
 #include "gfx/path.h"
@@ -28,6 +31,8 @@
 #include "views/widget/widget_utils.h"
 #include "views/window/window_win.h"
 
+#pragma comment(lib, "dwmapi.lib")
+
 using ui::ViewProp;
 
 namespace views {
@@ -107,6 +112,15 @@ WidgetWin* WidgetWin::GetRootWidget(HWND hwnd) {
   return widget;
 }
 
+// static
+bool WidgetWin::IsAeroGlassEnabled() {
+  if (base::win::GetVersion() < base::win::VERSION_VISTA)
+    return false;
+  // If composition is not enabled, we behave like on XP.
+  BOOL enabled = FALSE;
+  return SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled;
+}
+
 void WidgetWin::SetUseLayeredBuffer(bool use_layered_buffer) {
   if (use_layered_buffer_ == use_layered_buffer)
     return;