x11: Move X event handling out of the message-pump.

ui/base/dragdrop/os_exchange_data_unittest.cc

 // Copyright 2013 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 "base/message_loop/message_loop.h"
 #include "base/pickle.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
+#include "ui/events/platform/platform_event_source.h"
 #include "url/gurl.h"
 
 namespace ui {
 
 class OSExchangeDataTest : public PlatformTest {
+ public:
+  OSExchangeDataTest()
+      : event_source_(ui::PlatformEventSource::CreateDefault()) {}
+
  private:
   base::MessageLoopForUI message_loop_;
+  scoped_ptr<PlatformEventSource> event_source_;
 };
 
 TEST_F(OSExchangeDataTest, StringDataGetAndSet) {
   OSExchangeData data;
   base::string16 input = base::ASCIIToUTF16("I can has cheezburger?");
   data.SetString(input);
 
   OSExchangeData data2(data.provider().Clone());
   base::string16 output;
   EXPECT_TRUE(data2.GetString(&output));
@@ skipping 63 matching lines @@
       "</BODY>\n</HTML>");
   data.SetHtml(html, url);
 
   OSExchangeData copy(data.provider().Clone());
   base::string16 read_html;
   EXPECT_TRUE(copy.GetHtml(&read_html, &url));
   EXPECT_EQ(html, read_html);
 }
 
 }  // namespace ui