Don't redraw plugin windows on moving when using gpu browser compositor

Plugin windows are redrawn after EndDeferWindowPos call anyway.
Redrawing in SetWindowRgn causes plugin windows to be drawn on browser chrome.

BUG=

Review URL: https://codereview.chromium.org/118163003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242070 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/render_widget_host_view_base.cc

@@ -292,7 +292,8 @@ void RenderWidgetHostViewBase::MovePluginWindowsHelper(
 
       // Note: System will own the hrgn after we call SetWindowRgn,
       // so we don't need to call DeleteObject(hrgn)
-      ::SetWindowRgn(window, hrgn, !move.clip_rect.IsEmpty());
+      ::SetWindowRgn(window, hrgn,
+                     !move.clip_rect.IsEmpty() && (flags & SWP_NOREDRAW) == 0);
 
 #if defined(USE_AURA)
       // When using the software compositor, if the clipping rectangle is empty