Revert of skpbench: add option for gpu timing

tools/gpu/GpuTimer.h

-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GpuTimer_DEFINED
-#define GpuTimer_DEFINED
-
-#include "SkTypes.h"
-#include "SkExchange.h"
-#include <chrono>
-
-namespace sk_gpu_test {
-
-using PlatformTimerQuery = intptr_t;
-static constexpr PlatformTimerQuery kInvalidTimerQuery = 0;
-
-/**
- * Platform-independent interface for timing operations on the GPU.
- */
-class GpuTimer {
-public:
-    GpuTimer(bool disjointSupport)
-        : fDisjointSupport(disjointSupport)
-        , fActiveTimer(kInvalidTimerQuery) {
-    }
-    virtual ~GpuTimer() { SkASSERT(!fActiveTimer); }
-
-    /**
-     * Returns whether this timer can detect disjoint GPU operations while timing. If false, a query
-     * has less confidence when it completes with QueryStatus::kAccurate.
-     */
-    bool disjointSupport() const { return fDisjointSupport; }
-
-    /**
-     * Inserts a "start timing" command in the GPU command stream.
-     */
-    void queueStart() {
-        SkASSERT(!fActiveTimer);
-        fActiveTimer = this->onQueueTimerStart();
-    }
-
-    /**
-     * Inserts a "stop timing" command in the GPU command stream.
-     *
-     * @return a query object that can retrieve the time elapsed once the timer has completed.
-     */
-    PlatformTimerQuery SK_WARN_UNUSED_RESULT queueStop() {
-        SkASSERT(fActiveTimer);
-        this->onQueueTimerStop(fActiveTimer);
-        return skstd::exchange(fActiveTimer, kInvalidTimerQuery);
-    }
-
-    enum class QueryStatus {
-        kInvalid,  //<! the timer query is invalid.
-        kPending,  //<! the timer is still running on the GPU.
-        kDisjoint, //<! the query is complete, but dubious due to disjoint GPU operations.
-        kAccurate  //<! the query is complete and reliable.
-    };
-
-    virtual QueryStatus checkQueryStatus(PlatformTimerQuery) = 0;
-    virtual std::chrono::nanoseconds getTimeElapsed(PlatformTimerQuery) = 0;
-    virtual void deleteQuery(PlatformTimerQuery) = 0;
-
-private:
-    virtual PlatformTimerQuery onQueueTimerStart() const = 0;
-    virtual void onQueueTimerStop(PlatformTimerQuery) const = 0;
-
-    bool const           fDisjointSupport;
-    PlatformTimerQuery   fActiveTimer;
-};
-
-}  // namespace sk_gpu_test
-
-#endif