Introduce a CompilerDispatcherTracer and track how long jobs take

BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 963 matching lines @@
     "src/compilation-cache.cc",
     "src/compilation-cache.h",
     "src/compilation-dependencies.cc",
     "src/compilation-dependencies.h",
     "src/compilation-info.cc",
     "src/compilation-info.h",
     "src/compilation-statistics.cc",
     "src/compilation-statistics.h",
     "src/compiler-dispatcher/compiler-dispatcher-job.cc",
     "src/compiler-dispatcher/compiler-dispatcher-job.h",
+    "src/compiler-dispatcher/compiler-dispatcher-tracer.cc",
+    "src/compiler-dispatcher/compiler-dispatcher-tracer.h",
     "src/compiler-dispatcher/optimizing-compile-dispatcher.cc",
     "src/compiler-dispatcher/optimizing-compile-dispatcher.h",
     "src/compiler.cc",
     "src/compiler.h",
     "src/compiler/access-builder.cc",
     "src/compiler/access-builder.h",
     "src/compiler/access-info.cc",
     "src/compiler/access-info.h",
     "src/compiler/all-nodes.cc",
     "src/compiler/all-nodes.h",
@@ skipping 1222 matching lines @@
     "src/base/platform/condition-variable.cc",
     "src/base/platform/condition-variable.h",
     "src/base/platform/elapsed-timer.h",
     "src/base/platform/mutex.cc",
     "src/base/platform/mutex.h",
     "src/base/platform/platform.h",
     "src/base/platform/semaphore.cc",
     "src/base/platform/semaphore.h",
     "src/base/platform/time.cc",
     "src/base/platform/time.h",
+    "src/base/ring-buffer.h",
     "src/base/safe_conversions.h",
     "src/base/safe_conversions_impl.h",
     "src/base/safe_math.h",
     "src/base/safe_math_impl.h",
     "src/base/sys-info.cc",
     "src/base/sys-info.h",
     "src/base/utils/random-number-generator.cc",
     "src/base/utils/random-number-generator.h",
   ]
 
@@ skipping 746 matching lines @@
   ]
 
   configs = [
     ":external_config",
     ":internal_config_base",
   ]
 }
 
 v8_fuzzer("wasm_data_section_fuzzer") {
 }