Introduce a CompilerDispatcherTracer and track how long jobs take

src/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 719 matching lines @@
         'compiler/value-numbering-reducer.h',
         'compiler/verifier.cc',
         'compiler/verifier.h',
         'compiler/wasm-compiler.cc',
         'compiler/wasm-compiler.h',
         'compiler/wasm-linkage.cc',
         'compiler/zone-stats.cc',
         'compiler/zone-stats.h',
         'compiler-dispatcher/compiler-dispatcher-job.cc',
         'compiler-dispatcher/compiler-dispatcher-job.h',
+        'compiler-dispatcher/compiler-dispatcher-tracer.cc',
+        'compiler-dispatcher/compiler-dispatcher-tracer.h',
         'compiler-dispatcher/optimizing-compile-dispatcher.cc',
         'compiler-dispatcher/optimizing-compile-dispatcher.h',
         'compiler.cc',
         'compiler.h',
         'context-measure.cc',
         'context-measure.h',
         'contexts-inl.h',
         'contexts.cc',
         'contexts.h',
         'conversions-inl.h',
@@ skipping 1066 matching lines @@
         'base/platform/elapsed-timer.h',
         'base/platform/time.cc',
         'base/platform/time.h',
         'base/platform/condition-variable.cc',
         'base/platform/condition-variable.h',
         'base/platform/mutex.cc',
         'base/platform/mutex.h',
         'base/platform/platform.h',
         'base/platform/semaphore.cc',
         'base/platform/semaphore.h',
+        'base/ring-buffer.h',
         'base/safe_conversions.h',
         'base/safe_conversions_impl.h',
         'base/safe_math.h',
         'base/safe_math_impl.h',
         'base/sys-info.cc',
         'base/sys-info.h',
         'base/utils/random-number-generator.cc',
         'base/utils/random-number-generator.h',
       ],
       'target_conditions': [
@@ skipping 635 matching lines @@
       'conditions': [
         ['want_separate_host_toolset_mkpeephole==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }