linux: fix windowless Flash when scrolling

webkit/glue/plugins/webplugin_delegate_impl_gtk.cc

 // Copyright (c) 2006-2008 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 "webkit/glue/plugins/webplugin_delegate_impl.h"
 
 #include <string>
 #include <vector>
 
 #include <gtk/gtk.h>
@@ skipping 56 matching lines @@
       windowless_needs_set_window_(true),
       instance_(instance),
       pixmap_(NULL),
       first_event_time_(-1.0),
       parent_(containing_view),
       quirks_(0) {
   memset(&window_, 0, sizeof(window_));
   if (instance_->mime_type() == "application/x-shockwave-flash") {
     // Flash is tied to Firefox's whacky behavior with windowless plugins. See
     // comments in WindowlessPaint
-    quirks_ |= PLUGIN_QUIRK_WINDOWLESS_OFFSET_WINDOW_TO_DRAW;
+    quirks_ |= PLUGIN_QUIRK_WINDOWLESS_OFFSET_WINDOW_TO_DRAW
+        | PLUGIN_QUIRK_WINDOWLESS_INVALIDATE_AFTER_SET_WINDOW;
   }
 }
 
 WebPluginDelegateImpl::~WebPluginDelegateImpl() {
   DestroyInstance();
 
   if (!windowless_)
     WindowedDestroyWindow();
 
   if (window_.ws_info) {
@@ skipping 521 matching lines @@
   extra->visual = GDK_VISUAL_XVISUAL(visual);
   extra->depth = visual->depth;
   GdkColormap* colormap = gdk_colormap_new(gdk_visual_get_system(), FALSE);
   extra->colormap = GDK_COLORMAP_XCOLORMAP(colormap);
 
   if (!force_set_window)
     windowless_needs_set_window_ = false;
 
   NPError err = instance()->NPP_SetWindow(&window_);
   DCHECK(err == NPERR_NO_ERROR);
+  if (quirks_ & PLUGIN_QUIRK_WINDOWLESS_INVALIDATE_AFTER_SET_WINDOW) {
+    // After a NPP_SetWindow, Flash cancels its timer that generates the
+    // invalidates until it gets a paint event, but doesn't explicitly call
+    // NPP_InvalidateRect.
+    plugin_->InvalidateRect(clip_rect_);
+  }
 }
 
 void WebPluginDelegateImpl::SetFocus() {
   DCHECK(instance()->windowless());
 
   NPEvent np_event = {0};
   XFocusChangeEvent &event = np_event.xfocus;
   event.type = FocusIn;
   event.display = GDK_DISPLAY();
   // Same values as Firefox. .serial and .window stay 0.
@@ skipping 224 matching lines @@
   return stream;
 }
 
 void WebPluginDelegateImpl::URLRequestRouted(const std::string&url,
                                              bool notify_needed,
                                              intptr_t notify_data) {
   if (notify_needed) {
     instance()->SetURLLoadData(GURL(url.c_str()), notify_data);
   }
 }