MacViews: Add WidgetEventGenerator to abstract platform-specific event generation for tests.

ui/views/test/widget_event_generator.h

+// 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.
+
+#ifndef UI_VIEWS_TEST_WIDGET_EVENT_GENERATOR_H_
+#define UI_VIEWS_TEST_WIDGET_EVENT_GENERATOR_H_
+
+#include "base/macros.h"
+#include "build/build_config.h"
+#include "ui/gfx/native_widget_types.h"
+
+#if defined(USE_AURA)
+#include "ui/aura/test/event_generator.h"
+#elif defined(OS_MACOSX)
+#include "ui/views/test/widget_event_generator_mac.h"
+#endif
+
+namespace views {
+class Widget;
+
+namespace test {
+
+#if defined(USE_AURA)
+typedef aura::test::EventGenerator PlatformEventGenerator;
+#elif defined(OS_MACOSX)
+typedef WidgetEventGeneratorMac PlatformEventGenerator;
+#endif
+
+// A cross-platform event generator that can dispatch events to a views::Widget
+// and will work correctly in a sharded non-interactive unit test. On Aura
+// builds, it is simply an aura::test::EventGenerator. On other platforms,
+// events are generated and dispatched to the native widget.
+class WidgetEventGenerator : public PlatformEventGenerator {

[Ben Goodger (Google), 2014/07/15 16:22:20]

Now that you've managed to hide the platform differences almost entirely behind
EventGeneratorDelegate, can you try to avoid subclassing EventGenerator?

Inheritance in non-interface framework types gives me the heebee-jeebees.

[tapted, 2014/07/16 07:56:07]

Done. Took some juggling, but getting rid of these helper classes got rid of a
lot of boring code (3 files - widget_event_generator{.h,_aura.h,_aura.cc} - have
dropped off the review).

I think ui/views/test/widget_event_generator_mac.mm now needs a different name
and could potentially go somewhere else (ui/events/test even). I've kept it
where it is for now so the patchset diff doesn't break. (The Widget dependency
is gone, but the conservative part of me wants to just rename it to
event_generator_mac.mm in case it needs views stuff again..).

+ public:
+  explicit WidgetEventGenerator(Widget* widget);
+  explicit WidgetEventGenerator(gfx::NativeView context);
+  WidgetEventGenerator(gfx::NativeView context,
+                       Widget* window_for_initial_location);
+
+  virtual ~WidgetEventGenerator();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WidgetEventGenerator);
+};
+
+}  // namespace test
+}  // namespace views
+
+#endif  // UI_VIEWS_TEST_WIDGET_EVENT_GENERATOR_H_