Added additional logging to flaky test "LoginGuestTest.CursorShown"

ui/gfx/geometry/test/rect_test_util.cc

+// Copyright 2017 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 "ui/gfx/geometry/test/rect_test_util.h"
+
+namespace gfx {
+namespace test {
+
+testing::AssertionResult RectContains(const gfx::Rect& outer_rect,
+                                      const gfx::Rect& inner_rect) {
+  if (outer_rect.Contains(inner_rect)) {
+    return testing::AssertionSuccess()

[sky, 2017/02/17 16:44:13]

Is it really typical to log information about the reason for success? I
definitely get logging the failure reason, but logging success seems excessive.

[bruthig, 2017/02/17 16:49:17]

The success logging will be used if it fails an (EXPECT|ASSERT)_FALSE().

+           << "outer_rect (" << outer_rect.ToString()
+           << ") does contain inner_rect (" << inner_rect.ToString() << ")";
+  }
+  return testing::AssertionFailure() << "outer_rect (" << outer_rect.ToString()
+                                     << ") does not contain inner_rect ("
+                                     << inner_rect.ToString() << ")";
+}
+
+}  // namespace test
+}  // namespace gfx