Gamepad: add test support for page visibility behavior

content/public/renderer/renderer_gamepad_provider.h

+// Copyright (c) 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 CONTENT_GAMEPAD_RENDERER_PROVIDER_H_
+#define CONTENT_GAMEPAD_RENDERER_PROVIDER_H_
+
+namespace blink {
+class WebGamepadListener;
+class WebGamepads;
+}
+
+namespace content {
+
+class RendererGamepadProvider {
+ public:
+  virtual void SampleGamepads(blink::WebGamepads& gamepads) = 0;
+  virtual void SetGamepadListener(blink::WebGamepadListener*) = 0;

[jam, 2014/06/18 23:23:42]

nit: name the parameter. also add comment for methods and class

+ protected:
+  virtual ~RendererGamepadProvider() {}
+};
+
+} // namespace content
+
+#endif