diff --git a/services/surfaceflinger/Scheduler/LayerHistory.cpp b/services/surfaceflinger/Scheduler/LayerHistory.cpp
new file mode 100644
index 0000000..e944eb9
--- /dev/null
+++ b/services/surfaceflinger/Scheduler/LayerHistory.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2018 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 "LayerHistory.h"
+
+#include <cinttypes>
+#include <cstdint>
+#include <numeric>
+#include <string>
+#include <unordered_map>
+
+#include <utils/Log.h>
+#include <utils/Timers.h>
+#include <utils/Trace.h>
+
+namespace android {
+
+LayerHistory::LayerHistory() {}
+
+LayerHistory::~LayerHistory() = default;
+
+void LayerHistory::insert(const std::string layerName, nsecs_t presentTime) {
+    mElements[mCounter].insert(std::make_pair(layerName, presentTime));
+}
+
+void LayerHistory::incrementCounter() {
+    mCounter++;
+    mCounter = mCounter % ARRAY_SIZE;
+    mElements[mCounter].clear();
+}
+
+const std::unordered_map<std::string, nsecs_t>& LayerHistory::get(size_t index) const {
+    return mElements.at(index);
+}
+
+} // namespace android
\ No newline at end of file
diff --git a/services/surfaceflinger/Scheduler/LayerHistory.h b/services/surfaceflinger/Scheduler/LayerHistory.h
new file mode 100644
index 0000000..1a7f9cd
--- /dev/null
+++ b/services/surfaceflinger/Scheduler/LayerHistory.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2018 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 <array>
+#include <cinttypes>
+#include <cstdint>
+#include <numeric>
+#include <string>
+#include <unordered_map>
+
+#include <utils/Timers.h>
+
+namespace android {
+
+/*
+ * This class represents a circular buffer in which we keep layer history for
+ * the past ARRAY_SIZE frames. Each time, a signal for new frame comes, the counter
+ * gets incremented and includes all the layers that are requested to draw in that
+ * frame.
+ *
+ * Once the buffer reaches the end of the array, it starts overriding the elements
+ * at the beginning of the array.
+ */
+class LayerHistory {
+public:
+    LayerHistory();
+    ~LayerHistory();
+
+    // Method for inserting layers and their requested present time into the ring buffer.
+    // The elements are going to be inserted into an unordered_map at the position of
+    // mCounter.
+    void insert(const std::string layerName, nsecs_t presentTime);
+    // Method for incrementing the current slot in the ring buffer. It also clears the
+    // unordered_map, if it was created previously.
+    void incrementCounter();
+    // Returns unordered_map at the given at index.
+    const std::unordered_map<std::string, nsecs_t>& get(size_t index) const;
+
+private:
+    size_t mCounter = 0;
+    static constexpr size_t ARRAY_SIZE = 30;
+    std::array<std::unordered_map<std::string, nsecs_t>, ARRAY_SIZE> mElements;
+};
+
+} // namespace android
\ No newline at end of file