Input event hub for evdev input HAL module.

InputHub monitors paths for device changes and input events.
InputDeviceManager creates InputDevices and routes input events to
them. InputDevices currently just log these events during development.
InputHost represents a wrapper around the HAL interface.

Change-Id: Ic47d574498eb07bcdcd17812a648539fdf1c69d6
diff --git a/tests/input/evdev/TestHelpers.h b/tests/input/evdev/TestHelpers.h
new file mode 100644
index 0000000..461db04
--- /dev/null
+++ b/tests/input/evdev/TestHelpers.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef ANDROID_TEST_HELPERS_H_
+#define ANDROID_TEST_HELPERS_H_
+
+#include <future>
+#include <thread>
+
+namespace android {
+
+/**
+ * Runs the given function after the specified delay.
+ * NOTE: if the std::future returned from std::async is not bound, this function
+ * will block until the task completes. This is almost certainly NOT what you
+ * want, so save the return value from delay_async into a variable:
+ *
+ * auto f = delay_async(100ms, []{ ALOGD("Hello world"); });
+ */
+template<class Function, class Duration>
+decltype(auto) delay_async(Duration&& delay, Function&& task)
+{
+    return std::async(std::launch::async, [=]{ std::this_thread::sleep_for(delay); task(); });
+}
+
+/**
+ * Creates and opens a temporary file at the given path. The file is unlinked
+ * and closed in the destructor.
+ */
+class TempFile {
+public:
+    TempFile(const char* path);
+    ~TempFile();
+
+    // No copy or assign
+    TempFile(const TempFile&) = delete;
+    TempFile& operator=(const TempFile&) = delete;
+
+    const char* getName() const { return mName; }
+    int getFd() const { return mFd; }
+
+private:
+    char* mName;
+    int mFd;
+};
+
+/**
+ * Creates a temporary directory that can create temporary files. The directory
+ * is emptied and deleted in the destructor.
+ */
+class TempDir {
+public:
+    TempDir();
+    ~TempDir();
+
+    // No copy or assign
+    TempDir(const TempDir&) = delete;
+    TempDir& operator=(const TempDir&) = delete;
+
+    const char* getName() const { return mName; }
+
+    TempFile* newTempFile();
+
+private:
+    char* mName;
+};
+
+}  // namespace android
+
+#endif  // ANDROID_TEST_HELPERS_H_