Remove the unused sampling profiler.

base/win/sampling_profiler_unittest.cc

-// Copyright (c) 2012 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 "base/logging.h"
-#include "base/test/test_timeouts.h"
-#include "base/win/sampling_profiler.h"
-#include "base/win/pe_image.h"
-#include "base/win/scoped_handle.h"
-#include "base/win/windows_version.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-// The address of our image base.
-extern "C" IMAGE_DOS_HEADER __ImageBase;
-
-namespace base {
-namespace win {
-
-namespace {
-
-class SamplingProfilerTest : public testing::Test {
- public:
-  SamplingProfilerTest() : code_start(NULL), code_size(0) {
-  }
-
-  virtual void SetUp() {
-    process.Set(::OpenProcess(PROCESS_QUERY_INFORMATION,
-                              FALSE,
-                              ::GetCurrentProcessId()));
-    ASSERT_TRUE(process.IsValid());
-
-    PEImage image(&__ImageBase);
-
-    // Get the address of the .text section, which is the first section output
-    // by the VS tools.
-    ASSERT_TRUE(image.GetNumSections() > 0);
-    const IMAGE_SECTION_HEADER* text_section = image.GetSectionHeader(0);
-    ASSERT_EQ(0, strncmp(".text",
-                         reinterpret_cast<const char*>(text_section->Name),
-                         arraysize(text_section->Name)));
-    ASSERT_NE(0U, text_section->Characteristics & IMAGE_SCN_MEM_EXECUTE);
-
-    code_start = reinterpret_cast<uint8*>(&__ImageBase) +
-        text_section->VirtualAddress;
-    code_size = text_section->Misc.VirtualSize;
-  }
-
- protected:
-  ScopedHandle process;
-  void* code_start;
-  size_t code_size;
-};
-
-}  // namespace
-
-TEST_F(SamplingProfilerTest, Initialize) {
-  SamplingProfiler profiler;
-
-  ASSERT_TRUE(profiler.Initialize(process.Get(), code_start, code_size, 8));
-}
-
-TEST_F(SamplingProfilerTest, Sample) {
-  if (base::win::GetVersion() == base::win::VERSION_WIN8) {
-    LOG(INFO) << "Not running test on Windows 8";
-    return;
-  }
-  SamplingProfiler profiler;
-
-  // Initialize with a huge bucket size, aiming for a single bucket.
-  ASSERT_TRUE(
-      profiler.Initialize(process.Get(), code_start, code_size, 31));
-
-  ASSERT_EQ(1, profiler.buckets().size());
-  ASSERT_EQ(0, profiler.buckets()[0]);
-
-  // We use a roomy timeout to make sure this test is not flaky.
-  // On the buildbots, there may not be a whole lot of CPU time
-  // allotted to our process in this wall-clock time duration,
-  // and samples will only accrue while this thread is busy on
-  // a CPU core.
-  base::TimeDelta spin_time = TestTimeouts::action_timeout();
-
-  base::TimeDelta save_sampling_interval;
-  ASSERT_TRUE(SamplingProfiler::GetSamplingInterval(&save_sampling_interval));
-
-  // Sample every 0.5 millisecs.
-  ASSERT_TRUE(SamplingProfiler::SetSamplingInterval(
-      base::TimeDelta::FromMicroseconds(500)));
-
-  ASSERT_TRUE(SamplingProfiler::SetSamplingInterval(
-      base::TimeDelta::FromMicroseconds(500)));
-
-  // Start the profiler.
-  ASSERT_TRUE(profiler.Start());
-
-  // Get a volatile pointer to our bucket to make sure that the compiler
-  // doesn't optimize out the test in the loop that follows.
-  volatile const ULONG* bucket_ptr = &profiler.buckets()[0];
-
-  // Spin for spin_time wall-clock seconds, or until we get some samples.
-  // Note that sleeping isn't going to do us any good, the samples only
-  // accrue while we're executing code.
-  base::Time start = base::Time::Now();
-  base::TimeDelta elapsed;
-  do {
-    elapsed = base::Time::Now() - start;
-  } while((elapsed < spin_time) && *bucket_ptr == 0);
-
-  // Stop the profiler.
-  ASSERT_TRUE(profiler.Stop());
-
-  // Restore the sampling interval we found.
-  ASSERT_TRUE(SamplingProfiler::SetSamplingInterval(save_sampling_interval));
-
-  // Check that we got some samples.
-  ASSERT_NE(0U, profiler.buckets()[0]);
-}
-
-}  // namespace win
-}  // namespace base