MacViews: Split ViewEventTestBase into platform-specific files.

chrome/test/base/view_event_test_platform_part_mac.mm

+// Copyright 2014 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 "chrome/test/base/view_event_test_platform_part.h"
+
+namespace {
+
+// ViewEventTestPlatformPart implementation for toolkit-views on Mac.
+class ViewEventTestPlatformPartMac : public ViewEventTestPlatformPart {
+ public:
+  ViewEventTestPlatformPartMac() {}
+
+  // Overridden from ViewEventTestPlatformPart:
+  virtual gfx::NativeWindow GetContext() OVERRIDE { return NULL; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ViewEventTestPlatformPartMac);
+};
+
+}  // namespace
+
+// static
+ViewEventTestPlatformPart* ViewEventTestPlatformPart::Create(
+    ui::ContextFactory* context_factory) {
+  return new ViewEventTestPlatformPartMac();
+}