Revert of Introduce mojo interface for collecting StackSamplingProfiler data

components/metrics/public/cpp/call_stack_profile_struct_traits.h

-// Copyright 2016 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.
-
-// Defines StructTraits specializations for translating between mojo types and
-// base::StackSamplingProfiler types, with data validity checks.
-
-#ifndef COMPONENTS_METRICS_CALL_STACK_PROFILE_STRUCT_TRAITS_H_
-#define COMPONENTS_METRICS_CALL_STACK_PROFILE_STRUCT_TRAITS_H_
-
-#include <vector>
-
-#include "base/files/file_path.h"
-#include "base/profiler/stack_sampling_profiler.h"
-#include "components/metrics/public/interfaces/call_stack_profile_collector.mojom.h"
-
-namespace mojo {
-
-template <>
-struct StructTraits<metrics::mojom::CallStackModule,
-                    base::StackSamplingProfiler::Module> {
-  static uint64_t base_address(
-      const base::StackSamplingProfiler::Module& module) {
-    return module.base_address;
-  }
-  static const std::string& id(
-      const base::StackSamplingProfiler::Module& module) {
-    return module.id;
-  }
-  static const base::FilePath& filename(
-      const base::StackSamplingProfiler::Module& module) {
-    return module.filename;
-  }
-
-  static bool Read(metrics::mojom::CallStackModuleDataView data,
-                   base::StackSamplingProfiler::Module* out) {
-    // Linux has the longest build id at 40 bytes.
-    static const size_t kMaxIDSize = 40;
-
-    std::string id;
-    base::FilePath filename;
-    if (!data.ReadId(&id) || id.size() > kMaxIDSize ||
-        !data.ReadFilename(&filename))
-      return false;
-
-    *out =
-        base::StackSamplingProfiler::Module(data.base_address(), id, filename);
-    return true;
-  }
-};
-
-template <>
-struct StructTraits<metrics::mojom::CallStackFrame,
-                    base::StackSamplingProfiler::Frame> {
-  static uint64_t instruction_pointer(
-      const base::StackSamplingProfiler::Frame& frame) {
-    return frame.instruction_pointer;
-  }
-  static uint64_t module_index(
-      const base::StackSamplingProfiler::Frame& frame) {
-    return frame.module_index ==
-        base::StackSamplingProfiler::Frame::kUnknownModuleIndex ?
-        static_cast<uint64_t>(-1) :
-        frame.module_index;
-  }
-
-  static bool Read(metrics::mojom::CallStackFrameDataView data,
-                   base::StackSamplingProfiler::Frame* out) {
-    size_t module_index = data.module_index() == static_cast<uint64_t>(-1) ?
-        base::StackSamplingProfiler::Frame::kUnknownModuleIndex :
-        data.module_index();
-
-    // We can't know whether the module_index field is valid at this point since
-    // we don't have access to the number of modules here. This will be checked
-    // in CallStackProfile's Read function below.
-    *out = base::StackSamplingProfiler::Frame(data.instruction_pointer(),
-                                              module_index);
-    return true;
-  }
-};
-
-template <>
-struct StructTraits<metrics::mojom::CallStackProfile,
-                    base::StackSamplingProfiler::CallStackProfile> {
-  static const std::vector<base::StackSamplingProfiler::Module>& modules(
-      const base::StackSamplingProfiler::CallStackProfile& profile) {
-    return profile.modules;
-  }
-  static const std::vector<base::StackSamplingProfiler::Sample>& samples(
-      const base::StackSamplingProfiler::CallStackProfile& profile) {
-    return profile.samples;
-  }
-  static const base::TimeDelta profile_duration(
-      const base::StackSamplingProfiler::CallStackProfile& profile) {
-    return profile.profile_duration;
-  }
-  static const base::TimeDelta sampling_period(
-      const base::StackSamplingProfiler::CallStackProfile& profile) {
-    return profile.sampling_period;
-  }
-
-  static bool ValidateSamples(
-      std::vector<base::StackSamplingProfiler::Sample> samples,
-      size_t module_count) {
-    for (const base::StackSamplingProfiler::Sample& sample : samples) {
-      for (const base::StackSamplingProfiler::Frame& frame : sample) {
-        if (frame.module_index >= module_count &&
-            frame.module_index !=
-                base::StackSamplingProfiler::Frame::kUnknownModuleIndex)
-          return false;
-      }
-    }
-    return true;
-  }
-
-  static bool Read(metrics::mojom::CallStackProfileDataView data,
-                   base::StackSamplingProfiler::CallStackProfile* out) {
-    std::vector<base::StackSamplingProfiler::Module> modules;
-    std::vector<base::StackSamplingProfiler::Sample> samples;
-    base::TimeDelta profile_duration, sampling_period;
-    if (!data.ReadModules(&modules) || !data.ReadSamples(&samples) ||
-        !data.ReadProfileDuration(&profile_duration) ||
-        !data.ReadSamplingPeriod(&sampling_period) ||
-        !ValidateSamples(samples, modules.size()))
-      return false;
-
-    *out = base::StackSamplingProfiler::CallStackProfile();
-    out->modules = std::move(modules);
-    out->samples = std::move(samples);
-    out->profile_duration = profile_duration;
-    out->sampling_period = sampling_period;
-    return true;
-  }
-};
-
-}  // mojo
-
-#endif  // COMPONENTS_METRICS_CALL_STACK_PROFILE_STRUCT_TRAITS_H_