Add random motion input to keyboard

src/input_common/motion_from_button.cpp

@@ -0,0 +1,34 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "input_common/motion_from_button.h"
+#include "input_common/motion_input.h"
+
+namespace InputCommon {
+
+class MotionKey final : public Input::MotionDevice {
+public:
+    using Button = std::unique_ptr<Input::ButtonDevice>;
+
+    MotionKey(Button key_) : key(std::move(key_)) {}
+
+    Input::MotionStatus GetStatus() const override {
+
+        if (key->GetStatus()) {
+            return motion.GetRandomMotion(2, 6);
+        }
+        return motion.GetRandomMotion(0, 0);
+    }
+
+private:
+    Button key;
+    InputCommon::MotionInput motion{0.0f, 0.0f, 0.0f};
+};
+
+std::unique_ptr<Input::MotionDevice> MotionFromButton::Create(const Common::ParamPackage& params) {
+    auto key = Input::CreateDevice<Input::ButtonDevice>(params.Serialize());
+    return std::make_unique<MotionKey>(std::move(key));
+}
+
+} // namespace InputCommon