IVGCVSW-4316 First draft of IBackendProfiling and IBackendProfilingContext

* Introduce two new backend profiling interfaces IBackendProfiling
  and IBackendProfilingContext.
* Add a mechanism to pull a context from a backend through IBackendInternal
* Update CL, Neon and Ref backends to return an empty profiling backend.

Signed-off-by: Colm Donelan <Colm.Donelan@arm.com>
Change-Id: I6e7438fcb126ad7a073a226862dc44836c9998b7
diff --git a/include/armnn/backends/profiling/IBackendProfiling.hpp b/include/armnn/backends/profiling/IBackendProfiling.hpp
new file mode 100644
index 0000000..6ed7aba
--- /dev/null
+++ b/include/armnn/backends/profiling/IBackendProfiling.hpp
@@ -0,0 +1,92 @@
+//
+// Copyright © 2020 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+#include <armnn/IRuntime.hpp>
+#include <armnn/profiling/IProfilingGuidGenerator.hpp>
+#include <armnn/profiling/ISendTimelinePacket.hpp>
+#include <memory>
+#include <vector>
+
+namespace armnn
+{
+
+namespace profiling
+{
+
+struct CounterValue
+{
+    uint16_t counterId;
+    uint32_t counterValue;
+};
+
+struct Timestamp
+{
+    uint64_t timestamp;
+    std::vector<CounterValue> counterValues;
+};
+
+struct CounterStatus
+{
+    uint16_t m_BackendCounterId;
+    uint16_t m_GlobalCounterId;
+    bool     m_Enabled;
+    uint32_t m_SamplingRateInMicroseconds;
+};
+
+class IRegisterBackendCounters
+{
+public:
+    uint16_t RegisterCategory(const std::string& categoryName,
+                              const Optional<uint16_t>& deviceUid     = EmptyOptional(),
+                              const Optional<uint16_t>& counterSetUid = EmptyOptional());
+
+    uint16_t RegisterDevice(const std::string& deviceName,
+                            uint16_t cores                                  = 0,
+                            const Optional<std::string>& parentCategoryName = EmptyOptional());
+
+    uint16_t RegisterCounterSet(const std::string& counterSetName,
+                                uint16_t count                                  = 0,
+                                const Optional<std::string>& parentCategoryName = EmptyOptional());
+
+    uint16_t RegisterCounter(const uint16_t uid,
+                             const std::string& parentCategoryName,
+                             uint16_t counterClass,
+                             uint16_t interpolation,
+                             double multiplier,
+                             const std::string& name,
+                             const std::string& description,
+                             const Optional<std::string>& units      = EmptyOptional(),
+                             const Optional<uint16_t>& numberOfCores = EmptyOptional(),
+                             const Optional<uint16_t>& deviceUid     = EmptyOptional(),
+                             const Optional<uint16_t>& counterSetUid = EmptyOptional());
+};
+
+class IBackendProfiling
+{
+protected:
+    IBackendProfiling(const IRuntime::CreationOptions&)
+    {}
+
+public:
+    virtual ~IBackendProfiling()
+    {}
+
+    IRegisterBackendCounters GetCounterRegistrationInterface(uint16_t currentMaxGlobalCounterID);
+
+    ISendTimelinePacket& GetSendTimelinePacket();
+
+    IProfilingGuidGenerator& GetProfilingGuidGenerator();
+
+    void ReportCounters(const std::vector<Timestamp>& counterValues);
+
+    CounterStatus GetCounterStatus(uint16_t backendCounterId);
+
+    std::vector<CounterStatus> GetActiveCounters();
+
+    bool IsProfilingEnabled() const;
+};
+}    // namespace profiling
+}    // namespace armnn
\ No newline at end of file