We need to set the clipping region of the HDC passed in to a windowless flash...

webkit/glue/plugins/test/plugin_execute_script_delete_test.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.
-
-#define STRSAFE_NO_DEPRECATE
-#include "webkit/glue/plugins/test/plugin_execute_script_delete_test.h"
-#include "webkit/glue/plugins/test/plugin_client.h"
-
-namespace NPAPIClient {
-
-ExecuteScriptDeleteTest::ExecuteScriptDeleteTest(
-    NPP id, NPNetscapeFuncs *host_functions, const std::string& test_name)
-  : PluginTest(id, host_functions),
-    test_name_(test_name) {
-}
-
-int16 ExecuteScriptDeleteTest::HandleEvent(void* event) {
-
-  NPNetscapeFuncs* browser = NPAPIClient::PluginClient::HostFunctions();
-
-  NPBool supports_windowless = 0;
-  NPError result = browser->getvalue(id(), NPNVSupportsWindowless,
-                                     &supports_windowless);
-  if ((result != NPERR_NO_ERROR) || (supports_windowless != TRUE)) {
-    SetError("Failed to read NPNVSupportsWindowless value");
-    SignalTestCompleted();
-    return PluginTest::HandleEvent(event);
-  }
-
-  NPEvent* np_event = reinterpret_cast<NPEvent*>(event);
-  if (WM_PAINT == np_event->event &&
-      base::strcasecmp(test_name_.c_str(),
-                       "execute_script_delete_in_paint") == 0) {
-    NPUTF8* urlString = "javascript:DeletePluginWithinScript()";
-    NPUTF8* targetString = NULL;
-    browser->geturl(id(), urlString, targetString);
-    SignalTestCompleted();
-  } else if (WM_MOUSEMOVE == np_event->event &&
-             base::strcasecmp(test_name_.c_str(),
-                              "execute_script_delete_in_mouse_move") == 0) {
-    std::string script = "javascript:DeletePluginWithinScript()";
-    NPString script_string;
-    script_string.UTF8Characters = script.c_str();
-    script_string.UTF8Length =
-        static_cast<unsigned int>(script.length());
-
-    NPObject *window_obj = NULL;
-    browser->getvalue(id(), NPNVWindowNPObject, &window_obj);
-    NPVariant result_var;
-    NPError result = browser->evaluate(id(), window_obj,
-                                       &script_string, &result_var);
-    SignalTestCompleted();
-  }
-  // If this test failed, then we'd have crashed by now.
-  return PluginTest::HandleEvent(event);
-}
-
-} // namespace NPAPIClient