Move TimeClamper to core/timing

TimeClamper is only used by Performance, so there is no need
to put it as low as platform/.

Change-Id: I531be082528f2e569bbff08a5ace42076d9bb845
Reviewed-on: https://chromium-review.googlesource.com/1157174Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584583}

third_party/blink/renderer/DEPS

 include_rules = [
     "+base/auto_reset.h",
+    "+base/bit_cast.h",
     "+base/callback.h",
     "+base/callback_forward.h",
     "+base/containers/span.h",

third_party/blink/renderer/core/BUILD.gn

@@ -2170,6 +2170,7 @@ jumbo_source_set("unit_tests") {
     "timing/performance_observer_test.cc",
     "timing/performance_resource_timing_test.cc",
     "timing/performance_test.cc",
+    "timing/time_clamper_test.cc",
     "timing/window_performance_test.cc",
     "url/url_search_params_test.cc",
     "workers/dedicated_worker_test.cc",

third_party/blink/renderer/core/timing/BUILD.gn

@@ -46,6 +46,8 @@ blink_core_sources("timing") {
     "sub_task_attribution.h",
     "task_attribution_timing.cc",
     "task_attribution_timing.h",
+    "time_clamper.cc",
+    "time_clamper.h",
     "window_performance.cc",
     "window_performance.h",
     "worker_global_scope_performance.cc",

third_party/blink/renderer/core/timing/performance.cc

@@ -50,10 +50,10 @@
 #include "third_party/blink/renderer/core/timing/performance_observer.h"
 #include "third_party/blink/renderer/core/timing/performance_resource_timing.h"
 #include "third_party/blink/renderer/core/timing/performance_user_timing.h"
+#include "third_party/blink/renderer/core/timing/time_clamper.h"
 #include "third_party/blink/renderer/platform/loader/fetch/resource_response.h"
 #include "third_party/blink/renderer/platform/loader/fetch/resource_timing_info.h"
 #include "third_party/blink/renderer/platform/runtime_enabled_features.h"
-#include "third_party/blink/renderer/platform/time_clamper.h"
 #include "third_party/blink/renderer/platform/weborigin/security_origin.h"
 #include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
 #include "third_party/blink/renderer/platform/wtf/time.h"

third_party/blink/renderer/platform/time_clamper.cc → third_party/blink/renderer/core/timing/time_clamper.cc

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "third_party/blink/renderer/platform/time_clamper.h"
+#include "third_party/blink/renderer/core/timing/time_clamper.h"
 
 #include "base/bit_cast.h"
 #include "base/rand_util.h"

third_party/blink/renderer/platform/time_clamper.h → third_party/blink/renderer/core/timing/time_clamper.h

@@ -2,17 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TIME_CLAMPER_H_
-#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TIME_CLAMPER_H_
+#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_TIMING_TIME_CLAMPER_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_TIMING_TIME_CLAMPER_H_
 
 #include "base/macros.h"
-#include "third_party/blink/renderer/platform/platform_export.h"
+#include "third_party/blink/renderer/core/core_export.h"
 
 #include <stdint.h>
 
 namespace blink {
 
-class PLATFORM_EXPORT TimeClamper {
+class CORE_EXPORT TimeClamper {
  public:
   static constexpr double kResolutionSeconds = 0.0001;
 
@@ -39,4 +39,4 @@ class PLATFORM_EXPORT TimeClamper {
 
 }  // namespace blink
 
-#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TIME_CLAMPER_H_
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_TIMING_TIME_CLAMPER_H_

third_party/blink/renderer/platform/time_clamper_test.cc → third_party/blink/renderer/core/timing/time_clamper_test.cc

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "third_party/blink/renderer/platform/time_clamper.h"
+#include "third_party/blink/renderer/core/timing/time_clamper.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 

third_party/blink/renderer/platform/BUILD.gn

@@ -1336,8 +1336,6 @@ jumbo_component("platform") {
     "theme.cc",
     "theme.h",
     "theme_types.h",
-    "time_clamper.cc",
-    "time_clamper.h",
     "timer.cc",
     "timer.h",
     "transforms/affine_transform.cc",
@@ -1821,7 +1819,6 @@ jumbo_source_set("blink_platform_unittests_sources") {
     "text/text_run_test.cc",
     "text/unicode_utilities_test.cc",
     "text/writing_mode_utils_test.cc",
-    "time_clamper_test.cc",
     "timer_test.cc",
     "transforms/affine_transform_test.cc",
     "transforms/rotation_test.cc",