Introduce AndroidFocusRules and NativeWidgetAndroid

ui/views/widget/desktop_android/android_focus_rules.h

 // Copyright 2015 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_EXAMPLES_VECTOR_EXAMPLE_H_
-#define UI_VIEWS_EXAMPLES_VECTOR_EXAMPLE_H_
+#ifndef UI_VIEWS_WIDGET_DESKTOP_ANDROID_ANDROID_FOCUS_RULES_H_
+#define UI_VIEWS_WIDGET_DESKTOP_ANDROID_ANDROID_FOCUS_RULES_H_
 
 #include "base/macros.h"
-#include "ui/views/examples/example_base.h"
+#include "ui/wm/core/base_focus_rules.h"
 
 namespace views {
-namespace examples {
 
-class VIEWS_EXAMPLES_EXPORT VectorExample : public ExampleBase {
+// A set of focus rules for Android using aura.
+class AndroidFocusRules : public wm::BaseFocusRules {

[sky, 2015/11/16 22:06:54]

We generally have the platform as the suffix, eng FocusRulesAndroid.

[bshe, 2015/11/17 16:44:31]

I originally want to use suffix too. But later I found all other subclasses of
BaseFocusRules do not use suffix. Examples are AshFocusRules, DesktopFocusRules
and AppsFocusRules. So I decide to use android_focus_rules here to be consistent
with others.
However, only Android is a platform name here. So I can see the argument to use
it as a suffix too. But before I make the change, given the name convention of
other classes, just want to double check with you to see if you still prefer to
use android as suffix.

  public:
-  VectorExample();
-  ~VectorExample() override;
-
-  // ExampleBase:
-  void CreateExampleView(View* container) override;
+  AndroidFocusRules();
+  ~AndroidFocusRules() override;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(VectorExample);
+  // wm::BaseFocusRules:
+  bool SupportsChildActivation(aura::Window* window) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(AndroidFocusRules);
 };
 
-}  // namespace examples
 }  // namespace views
 
-#endif  // UI_VIEWS_EXAMPLES_VECTOR_EXAMPLE_H_
+#endif  // UI_VIEWS_WIDGET_DESKTOP_ANDROID_ANDROID_FOCUS_RULES_H_