new utility AsyncJobQueue (#9278)

* new utility AsyncJobQueue

this is a very simple job queue, it spawns a thread and runs the jobs
pushed to the queue in sequence.

* use AsyncJobQueue in OpenGLTimerQuery

libs/utils/src/AsyncJobQueue.cpp

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2025 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.
+ */
+
+#include <utils/AsyncJobQueue.h>
+#include <utils/JobSystem.h>
+#include <utils/debug.h>
+
+#include <mutex>
+#include <utility>
+
+namespace utils {
+
+AsyncJobQueue::AsyncJobQueue(const char* name, Priority priority) {
+    mQueue.reserve(2);
+    mThread = std::thread([this, name, priority]() {
+        JobSystem::setThreadName(name);
+        JobSystem::setThreadPriority(priority);
+        auto& queue = mQueue;
+        bool exitRequested;
+        do {
+            std::unique_lock lock(mLock);
+            mCondition.wait(lock, [this]() -> bool { return mExitRequested || !mQueue.empty(); });
+            exitRequested = mExitRequested;
+            if (!queue.empty()) {
+                Job const job(std::move(queue.front()));
+                queue.erase(queue.begin());
+                lock.unlock();
+
+                job();
+            }
+        } while (!exitRequested);
+    });
+}
+
+AsyncJobQueue::~AsyncJobQueue() noexcept {
+    assert_invariant(mQueue.empty());
+}
+
+void AsyncJobQueue::push(Job&& job) {
+    std::unique_lock lock(mLock);
+    if (!mExitRequested) {
+        mQueue.push_back(std::move(job));
+        lock.unlock();
+        mCondition.notify_one();
+    }
+}
+
+void AsyncJobQueue::drainAndExit() {
+    std::unique_lock lock(mLock);
+    mCondition.wait(lock, [this] { return mQueue.empty(); });
+    mExitRequested = true;
+    lock.unlock();
+    mCondition.notify_one();
+    if (mThread.joinable()) {
+        mThread.join();
+    }
+}
+
+} // namespace utils