Custom frame UI for platform apps on Windows.

chrome/browser/ui/views/tab_contents/native_tab_contents_view_win.cc

Index: chrome/browser/ui/views/tab_contents/native_tab_contents_view_win.cc
diff --git a/chrome/browser/ui/views/tab_contents/native_tab_contents_view_win.cc b/chrome/browser/ui/views/tab_contents/native_tab_contents_view_win.cc
index 3cc6670613b572c0aceaf6dac7079377e37ddfd7..b14ee188bf3a78372f6c4fca7c1fe8037d002962 100644
--- a/chrome/browser/ui/views/tab_contents/native_tab_contents_view_win.cc
+++ b/chrome/browser/ui/views/tab_contents/native_tab_contents_view_win.cc
@@ -283,6 +283,12 @@ void NativeTabContentsViewWin::OnNCPaint(HRGN rgn) {
   // here since the view will draw everything correctly.
 }
 
+LRESULT NativeTabContentsViewWin::OnNCHitTest(const CPoint& point) {
+  // Allow hit tests to fall through to the parent window.
+  SetMsgHandled(true);
+  return HTTRANSPARENT;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTabContentsViewWin, private: