Create TestInputChannel and TestLooper to better test InputConsumerNoResampling

Created TestInputChannel and TestLooper to control how InputMessages are
batched in InputConsumerNoResampling_test

Bug: 297226446
Flag: EXEMPT refactor
Test: TEST=libinput_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST --gtest_filter="InputConsumerTest*"
Change-Id: I036593b311a93ec301e8b9776b461505e853119f
diff --git a/include/input/LooperInterface.h b/include/input/LooperInterface.h
new file mode 100644
index 0000000..2d6719c
--- /dev/null
+++ b/include/input/LooperInterface.h
@@ -0,0 +1,39 @@
+/**
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <utils/Looper.h>
+#include <utils/StrongPointer.h>
+
+namespace android {
+
+/**
+ * LooperInterface allows the use of TestLooper in InputConsumerNoResampling without reassigning to
+ * Looper. LooperInterface is needed to control how InputConsumerNoResampling consumes and batches
+ * InputMessages.
+ */
+class LooperInterface {
+public:
+    virtual ~LooperInterface() = default;
+
+    virtual int addFd(int fd, int ident, int events, const sp<LooperCallback>& callback,
+                      void* data) = 0;
+    virtual int removeFd(int fd) = 0;
+
+    virtual sp<Looper> getLooper() const = 0;
+};
+} // namespace android