MacViews: Split ViewEventTestBase into platform-specific files.

chrome/test/base/chrome_views_test_helper_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/chrome_views_test_helper.h"
+
+namespace {
+
+// ChromeViewsTestHelper implementation for toolkit-views on Mac.
+class ChromeViewsTestHelperMac : public ChromeViewsTestHelper {
+ public:
+  ChromeViewsTestHelperMac() {}
+
+  // Overridden from ChromeViewsTestHelper:
+  virtual gfx::NativeWindow PlatformSetUp(
+      ui::ContextFactory* context_factory) OVERRIDE {
+    return NULL;
+  }
+
+  virtual void PlatformTearDown() OVERRIDE {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChromeViewsTestHelperMac);
+};
+
+}  // namespace
+
+// static
+ChromeViewsTestHelper* ChromeViewsTestHelper::Create() {
+  return new ChromeViewsTestHelperMac();
+}