Improve scrolling performance when there are many windowed plugins in a page....

webkit/tools/test_shell/test_webview_delegate.cc

Index: webkit/tools/test_shell/test_webview_delegate.cc
===================================================================
--- webkit/tools/test_shell/test_webview_delegate.cc	(revision 8043)
+++ webkit/tools/test_shell/test_webview_delegate.cc	(working copy)
@@ -29,6 +29,7 @@
 
 #if defined(OS_WIN)
 // TODO(port): make these files work everywhere.
+#include "base/gfx/gdi_util.h"
 #include "webkit/glue/plugins/webplugin_delegate_impl.h"
 #include "webkit/tools/test_shell/drag_delegate.h"
 #include "webkit/tools/test_shell/drop_delegate.h"
@@ -696,11 +697,32 @@
 void TestWebViewDelegate::DidMove(WebWidget* webwidget,
                                   const WebPluginGeometry& move) {
 #if defined(OS_WIN)
+  HRGN hrgn = ::CreateRectRgn(move.clip_rect.x(),
+                              move.clip_rect.y(),
+                              move.clip_rect.right(),
+                              move.clip_rect.bottom());
+  gfx::SubtractRectanglesFromRegion(hrgn, move.cutout_rects);
+
+  // Note: System will own the hrgn after we call SetWindowRgn,
+  // so we don't need to call DeleteObject(hrgn)
+  ::SetWindowRgn(move.window, hrgn, FALSE);
+
+  unsigned long flags = 0;
+  if (move.visible)
+    flags |= SWP_SHOWWINDOW;
+  else
+    flags |= SWP_HIDEWINDOW;
+
+  ::SetWindowPos(move.window,
+                 NULL,
+                 move.window_rect.x(),
+                 move.window_rect.y(),
+                 move.window_rect.width(),
+                 move.window_rect.height(),
+                 flags);
+
+#endif
   // TODO(port): add me once plugins work.
-  WebPluginDelegateImpl::MoveWindow(
-      move.window, move.window_rect, move.clip_rect, move.cutout_rects,
-      move.visible);
-#endif
 }
 
 bool TestWebViewDelegate::IsHidden() {