Add Clipboard::GetSequenceNumber test and fix Android.

ui/base/clipboard/clipboard_unittest.cc

 // Copyright (c) 2012 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 "build/build_config.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/pickle.h"
+#include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkScalar.h"
 #include "third_party/skia/include/core/SkUnPreMultiply.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
@@ skipping 687 matching lines @@
     writer.WriteHTML(UTF8ToUTF16("foo"), "bar");
     writer.WriteBookmark(UTF8ToUTF16("foo"), "bar");
     writer.WriteHyperlink(ASCIIToUTF16("foo"), "bar");
     writer.WriteWebSmartPaste();
     // Left out: WriteFile, WriteFiles, WriteBitmapFromPixels, WritePickledData.
   }
 
   // Passes if we don't crash.
 }
 
+// TODO(dcheng): Fix this test for Android. It's rather involved, since the
+// clipboard change listener is posted to the Java message loop, and spinning
+// that loop from C++ to trigger the callback in the test requires a non-trivial
+// amount of additional work.
+#if !defined(OS_ANDROID)
+// Simple test that the sequence number appears to change when the clipboard is
+// written to.
+// TODO(dcheng): Add a version to test CLIPBOARD_TYPE_SELECTION.
+TEST_F(ClipboardTest, GetSequenceNumber) {
+  const uint64 first_sequence_number =
+      clipboard().GetSequenceNumber(CLIPBOARD_TYPE_COPY_PASTE);
+
+  {
+    ScopedClipboardWriter writer(&clipboard(), CLIPBOARD_TYPE_COPY_PASTE);
+    writer.WriteText(UTF8ToUTF16("World"));
+  }
+
+  // On some platforms, the sequence number is updated by a UI callback so pump
+  // the message loop to make sure we get the notification.
+  base::RunLoop().RunUntilIdle();
+
+  const uint64 second_sequence_number =
+      clipboard().GetSequenceNumber(CLIPBOARD_TYPE_COPY_PASTE);
+
+  EXPECT_NE(first_sequence_number, second_sequence_number);
+}
+#endif
+
 #if defined(OS_ANDROID)
 
 // Test that if another application writes some text to the pasteboard the
 // clipboard properly invalidates other types.
 TEST_F(ClipboardTest, InternalClipboardInvalidation) {
   // Write a Webkit smart paste tag to our clipboard.
   {
     ScopedClipboardWriter clipboard_writer(&clipboard(),
                                            CLIPBOARD_TYPE_COPY_PASTE);
     clipboard_writer.WriteWebSmartPaste();
@@ skipping 50 matching lines @@
   EXPECT_TRUE(clipboard().IsFormatAvailable(
       Clipboard::GetPlainTextWFormatType(), CLIPBOARD_TYPE_COPY_PASTE));
 
   // Make sure the text is what we inserted while simulating the other app
   std::string contents;
   clipboard().ReadAsciiText(CLIPBOARD_TYPE_COPY_PASTE, &contents);
   EXPECT_EQ(contents, new_value);
 }
 #endif
 }  // namespace ui