Add Mac gamepad input remapper

content/browser/gamepad/gamepad_standard_mappings.h

Index: content/browser/gamepad/gamepad_standard_mappings.h
diff --git a/content/browser/gamepad/gamepad_standard_mappings.h b/content/browser/gamepad/gamepad_standard_mappings.h
new file mode 100644
index 0000000000000000000000000000000000000000..35b01f88b44135ffabd7be405a442d4f0e9eae3b
--- /dev/null
+++ b/content/browser/gamepad/gamepad_standard_mappings.h
@@ -0,0 +1,61 @@
+// Copyright (c) 2012 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_BROWSER_GAMEPAD_GAMEPAD_STANDARD_MAPPINGS_H_
+#define CONTENT_BROWSER_GAMEPAD_GAMEPAD_STANDARD_MAPPINGS_H_
+
+#include "base/string_piece.h"
+
+namespace WebKit {
+class WebGamepad;
+}
+
+namespace content {
+
+typedef void (*GamepadStandardMappingFunction)(
+    const WebKit::WebGamepad& original,
+    WebKit::WebGamepad* mapped);
+
+GamepadStandardMappingFunction GetGamepadStandardMappingFunction(
+    const base::StringPiece& vendor_id,
+    const base::StringPiece& product_id);
+
+// This defines our canonical mapping order for gamepad-like devices. If these
+// items cannot all be satisfied, it is a case-by-case judgement as to whether
+// it is better to leave the device unmapped, or to partially map it. In
+// general, err towards leaving it *unmapped* so that content can handle
+// appropriately.
+
+enum CanonicalButtonIndex {
+  kButtonPrimary,
+  kButtonSecondary,
+  kButtonTertiary,
+  kButtonQuaternary,
+  kButtonLeftShoulder,
+  kButtonRightShoulder,
+  kButtonLeftTrigger,
+  kButtonRightTrigger,
+  kButtonBackSelect,
+  kButtonStart,
+  kButtonLeftThumbstick,
+  kButtonRightThumbstick,
+  kButtonDpadUp,
+  kButtonDpadDown,
+  kButtonDpadLeft,
+  kButtonDpadRight,
+  kButtonMeta,
+  kNumButtons
+};
+
+enum CanonicalAxisIndex {
+  kAxisLeftStickX,
+  kAxisLeftStickY,
+  kAxisRightStickX,
+  kAxisRightStickY,
+  kNumAxes
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_STANDARD_MAPPINGS_H_