Update from https://crrev.com/318214

gpu/command_buffer/service/gpu_timing.cc

Index: gpu/command_buffer/service/gpu_timing.cc
diff --git a/gpu/command_buffer/service/gpu_timing.cc b/gpu/command_buffer/service/gpu_timing.cc
deleted file mode 100644
index 6ab3e831f387515c351e1319dd584725f2533d1b..0000000000000000000000000000000000000000
--- a/gpu/command_buffer/service/gpu_timing.cc
+++ /dev/null
@@ -1,146 +0,0 @@
-// Copyright (c) 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "gpu/command_buffer/service/gpu_timing.h"
-
-#include "base/time/time.h"
-#include "ui/gl/gl_bindings.h"
-#include "ui/gl/gl_context.h"
-#include "ui/gl/gl_version_info.h"
-
-namespace gpu {
-
-GPUTimer::GPUTimer(GPUTiming* gpu_timing) : gpu_timing_(gpu_timing) {
-  DCHECK(gpu_timing_);
-  memset(queries_, 0, sizeof(queries_));
-  glGenQueriesARB(2, queries_);
-}
-
-GPUTimer::~GPUTimer() {
-  glDeleteQueriesARB(2, queries_);
-}
-
-void GPUTimer::Start() {
-  // GL_TIMESTAMP and GL_TIMESTAMP_EXT both have the same value.
-  glQueryCounter(queries_[0], GL_TIMESTAMP);
-}
-
-void GPUTimer::End() {
-  end_requested_ = true;
-  offset_ = gpu_timing_->CalculateTimerOffset();
-  glQueryCounter(queries_[1], GL_TIMESTAMP);
-}
-
-bool GPUTimer::IsAvailable() {
-  if (!gpu_timing_->IsAvailable() || !end_requested_) {
-    return false;
-  }
-  GLint done = 0;
-  glGetQueryObjectivARB(queries_[1], GL_QUERY_RESULT_AVAILABLE, &done);
-  return done != 0;
-}
-
-void GPUTimer::GetStartEndTimestamps(int64* start, int64* end) {
-  DCHECK(start && end);
-  DCHECK(IsAvailable());
-  GLuint64 begin_stamp = 0;
-  GLuint64 end_stamp = 0;
-  // TODO(dsinclair): It's possible for the timer to wrap during the start/end.
-  // We need to detect if the end is less then the start and correct for the
-  // wrapping.
-  glGetQueryObjectui64v(queries_[0], GL_QUERY_RESULT, &begin_stamp);
-  glGetQueryObjectui64v(queries_[1], GL_QUERY_RESULT, &end_stamp);
-
-  *start = (begin_stamp / base::Time::kNanosecondsPerMicrosecond) + offset_;
-  *end = (end_stamp / base::Time::kNanosecondsPerMicrosecond) + offset_;
-}
-
-int64 GPUTimer::GetDeltaElapsed() {
-  int64 start = 0;
-  int64 end = 0;
-  GetStartEndTimestamps(&start, &end);
-  return end - start;
-}
-
-GPUTiming::GPUTiming() : cpu_time_for_testing_() {
-}
-
-GPUTiming::~GPUTiming() {
-}
-
-bool GPUTiming::Initialize(gfx::GLContext* gl_context) {
-  DCHECK(gl_context);
-  DCHECK_EQ(kTimerTypeInvalid, timer_type_);
-
-  const gfx::GLVersionInfo* version_info = gl_context->GetVersionInfo();
-  DCHECK(version_info);
-  if (version_info->is_es3 &&  // glGetInteger64v is supported under ES3.
-      gfx::g_driver_gl.ext.b_GL_EXT_disjoint_timer_query) {
-    timer_type_ = kTimerTypeDisjoint;
-    return true;
-  } else if (gfx::g_driver_gl.ext.b_GL_ARB_timer_query) {
-    timer_type_ = kTimerTypeARB;
-    return true;
-  }
-  return false;
-}
-
-bool GPUTiming::IsAvailable() {
-  return timer_type_ != kTimerTypeInvalid;
-}
-
-const char* GPUTiming::GetTimerTypeName() const {
-  switch (timer_type_) {
-    case kTimerTypeDisjoint:
-      return "GL_EXT_disjoint_timer_query";
-    case kTimerTypeARB:
-      return "GL_ARB_timer_query";
-    default:
-      return "Unknown";
-  }
-}
-
-bool GPUTiming::CheckAndResetTimerErrors() {
-  if (timer_type_ == kTimerTypeDisjoint) {
-    GLint disjoint_value = 0;
-    glGetIntegerv(GL_GPU_DISJOINT_EXT, &disjoint_value);
-    return disjoint_value != 0;
-  } else {
-    return false;
-  }
-}
-
-int64 GPUTiming::CalculateTimerOffset() {
-  if (!offset_valid_) {
-    GLint64 gl_now = 0;
-    glGetInteger64v(GL_TIMESTAMP, &gl_now);
-    int64 now =
-        cpu_time_for_testing_.is_null()
-            ? base::TimeTicks::NowFromSystemTraceTime().ToInternalValue()
-            : cpu_time_for_testing_.Run();
-    offset_ = now - gl_now / base::Time::kNanosecondsPerMicrosecond;
-    offset_valid_ = timer_type_ == kTimerTypeARB;
-  }
-  return offset_;
-}
-
-void GPUTiming::InvalidateTimerOffset() {
-  offset_valid_ = false;
-}
-
-void GPUTiming::SetCpuTimeForTesting(
-    const base::Callback<int64(void)>& cpu_time) {
-  cpu_time_for_testing_ = cpu_time;
-}
-
-void GPUTiming::SetOffsetForTesting(int64 offset, bool cache_it) {
-  offset_ = offset;
-  offset_valid_ = cache_it;
-}
-
-void GPUTiming::SetTimerTypeForTesting(TimerType type) {
-  timer_type_ = type;
-}
-
-}  // namespace gpu