[GN]: Enable PCH for WebKit on Mac.

third_party/WebKit/Source/core/BUILD.gn

Index: third_party/WebKit/Source/core/BUILD.gn
diff --git a/third_party/WebKit/Source/core/BUILD.gn b/third_party/WebKit/Source/core/BUILD.gn
index 6d30dc7a0499f3df5d804ee789bad04536faecbb..4a6d874eb48c60753a366aae8aea18ab5ac83399 100644
--- a/third_party/WebKit/Source/core/BUILD.gn
+++ b/third_party/WebKit/Source/core/BUILD.gn
@@ -62,6 +62,7 @@ source_set("generated") {
     "//third_party/qcms",
     "//third_party/sqlite",
     "//third_party/WebKit/Source/bindings/core/v8:bindings_core_v8_generated",
+
     # FIXME: don't depend on bindings/modules http://crbug.com/358074
     "//third_party/WebKit/Source/bindings/modules:bindings_modules_generated",
     "//third_party/WebKit/Source/bindings/modules/v8:bindings_modules_generated",
@@ -99,6 +100,7 @@ source_set("prerequisites") {
     "inspector:protocol_sources",
     "inspector:instrumentation_sources",
     "//third_party/WebKit/Source/bindings/core/v8:bindings_core_v8_generated",
+
     # FIXME: don't depend on bindings_modules http://crbug.com/358074
     "//third_party/WebKit/Source/bindings/modules/v8:bindings_modules_generated",
     "//third_party/WebKit/Source/platform",
@@ -110,10 +112,12 @@ source_set("prerequisites") {
     "//third_party/WebKit/Source:inside_blink",
   ]
 
+  if (is_mac) {
+    public_configs += [ "//third_party/WebKit/Source:mac_precompiled_headers" ]
+  }
+
   if (use_openmax_dl_fft) {
-    deps += [
-      "//third_party/openmax_dl/dl"
-    ]
+    deps += [ "//third_party/openmax_dl/dl" ]
   }
 }
 
@@ -148,9 +152,7 @@ source_set("core") {
     ":svg",
   ]
 
-  public_configs = [
-    ":core_include_dirs",
-  ]
+  public_configs = [ ":core_include_dirs" ]
 
   # TODO(GYP) IPP libraries pkg-config. These seem to be experimental and used
   # only on x86 Android. See also below. There should be one pkg-config call
@@ -163,9 +165,9 @@ source_set("dom") {
 
   configs -= core_config_remove
   configs += core_config_add + [
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    "//build/config/compiler:no_size_t_to_int_warning",
-  ]
+               # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+               "//build/config/compiler:no_size_t_to_int_warning",
+             ]
 
   deps = [
     ":prerequisites",
@@ -203,7 +205,7 @@ source_set("svg") {
   ]
 
   # TODO(GYP)
-  # Shard this taret into parts to work around linker limitations.
+  # Shard this target into parts to work around linker limitations.
   # on link time code generation builds.
   #['OS=="win" and buildtype=="Official"', {
   #  'msvs_shard': 5,
@@ -221,9 +223,9 @@ source_set("remaining") {
 
   configs -= core_config_remove
   configs += core_config_add + [
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    "//build/config/compiler:no_size_t_to_int_warning",
-  ]
+               # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+               "//build/config/compiler:no_size_t_to_int_warning",
+             ]
 
   cflags = []
   libs = []
@@ -233,9 +235,7 @@ source_set("remaining") {
   ]
 
   if (is_win) {
-    cflags += [
-      "/wd4334",
-    ]
+    cflags += [ "/wd4334" ]
   } else {  # !is_win
     sources -= [
       "layout/LayoutThemeFontProviderWin.cpp",
@@ -249,9 +249,7 @@ source_set("remaining") {
       "layout/LayoutThemeLinux.h",
     ]
     if (!is_android) {
-      sources -= [
-        "layout/LayoutThemeFontProviderLinux.cpp",
-      ]
+      sources -= [ "layout/LayoutThemeFontProviderLinux.cpp" ]
     }
   }
 
@@ -277,16 +275,8 @@ source_set("remaining") {
       "paint/ThemePainterDefault.h",
     ]
     libs += [ "Carbon.framework" ]
-    # Some Mac-specific parts of WebKit won't compile without having this
-    # prefix header injected.
-    cflags = [
-      "-include",
-      rebase_path("../build/mac/Prefix.h", root_build_dir),
-    ]
   } else {  # !is_mac
-    sources -= [
-      "editing/commands/SmartReplaceCF.cpp",
-    ]
+    sources -= [ "editing/commands/SmartReplaceCF.cpp" ]
   }
 }
 
@@ -313,44 +303,46 @@ source_set("testing") {
   sources += [
     "$bindings_core_v8_output_dir/V8DictionaryTest.cpp",
     "$bindings_core_v8_output_dir/V8DictionaryTest.h",
-    "$bindings_core_v8_output_dir/V8GarbageCollectedScriptWrappable.cpp",
-    "$bindings_core_v8_output_dir/V8GarbageCollectedScriptWrappable.h",
     "$bindings_core_v8_output_dir/V8GCObservation.cpp",
     "$bindings_core_v8_output_dir/V8GCObservation.h",
-    "$bindings_core_v8_output_dir/V8PrivateScriptTest.cpp",
-    "$bindings_core_v8_output_dir/V8PrivateScriptTest.h",
-    "$bindings_core_v8_output_dir/V8TypeConversions.cpp",
-    "$bindings_core_v8_output_dir/V8TypeConversions.h",
-    "$bindings_core_v8_output_dir/V8UnionTypesTest.cpp",
-    "$bindings_core_v8_output_dir/V8UnionTypesTest.h",
-    "$bindings_core_v8_output_dir/V8Internals.cpp",
-    "$bindings_core_v8_output_dir/V8Internals.h",
+    "$bindings_core_v8_output_dir/V8GarbageCollectedScriptWrappable.cpp",
+    "$bindings_core_v8_output_dir/V8GarbageCollectedScriptWrappable.h",
+    "$bindings_core_v8_output_dir/V8InternalDictionary.cpp",
+    "$bindings_core_v8_output_dir/V8InternalDictionary.h",
+    "$bindings_core_v8_output_dir/V8InternalDictionaryDerived.cpp",
+    "$bindings_core_v8_output_dir/V8InternalDictionaryDerived.h",
+    "$bindings_core_v8_output_dir/V8InternalRuntimeFlags.cpp",
+    "$bindings_core_v8_output_dir/V8InternalRuntimeFlags.h",
     "$bindings_core_v8_output_dir/V8InternalSettings.cpp",
     "$bindings_core_v8_output_dir/V8InternalSettings.h",
     "$bindings_core_v8_output_dir/V8InternalSettingsGenerated.cpp",
     "$bindings_core_v8_output_dir/V8InternalSettingsGenerated.h",
-    "$bindings_core_v8_output_dir/V8InternalRuntimeFlags.cpp",
-    "$bindings_core_v8_output_dir/V8InternalRuntimeFlags.h",
+    "$bindings_core_v8_output_dir/V8Internals.cpp",
+    "$bindings_core_v8_output_dir/V8Internals.h",
     "$bindings_core_v8_output_dir/V8LayerRect.cpp",
     "$bindings_core_v8_output_dir/V8LayerRect.h",
     "$bindings_core_v8_output_dir/V8LayerRectList.cpp",
     "$bindings_core_v8_output_dir/V8LayerRectList.h",
+    "$bindings_core_v8_output_dir/V8PrivateScriptTest.cpp",
+    "$bindings_core_v8_output_dir/V8PrivateScriptTest.h",
     "$bindings_core_v8_output_dir/V8RefCountedScriptWrappable.cpp",
     "$bindings_core_v8_output_dir/V8RefCountedScriptWrappable.h",
-    "$bindings_core_v8_output_dir/V8InternalDictionary.cpp",
-    "$bindings_core_v8_output_dir/V8InternalDictionary.h",
-    "$bindings_core_v8_output_dir/V8InternalDictionaryDerived.cpp",
-    "$bindings_core_v8_output_dir/V8InternalDictionaryDerived.h",
+    "$bindings_core_v8_output_dir/V8TypeConversions.cpp",
+    "$bindings_core_v8_output_dir/V8TypeConversions.h",
+    "$bindings_core_v8_output_dir/V8UnionTypesTest.cpp",
+    "$bindings_core_v8_output_dir/V8UnionTypesTest.h",
   ]
 }
 
 # GYP version: //third_party/WebKit/Source/core/core.gyp:webcore_generated
 source_set("core_generated") {
   sources = bindings_core_v8_files
+
   # These files include all the .cpp files generated from the .idl files
   # in webcore_files.
   sources += bindings_core_generated_aggregate_files
   sources += bindings_core_generated_union_type_files
+
   # IDL dictionary impl files generated by IDL compiler
   sources += generated_core_dictionary_files
 
@@ -398,16 +390,16 @@ source_set("core_generated") {
     "$blink_core_output_dir/XPathGrammar.cpp",
 
     # Additional .cpp files from the inspector_protocol_sources list.
-    "$blink_core_output_dir/InspectorFrontend.cpp",
     "$blink_core_output_dir/InspectorBackendDispatcher.cpp",
+    "$blink_core_output_dir/InspectorFrontend.cpp",
     "$blink_core_output_dir/InspectorTypeBuilder.cpp",
 
     # Additional .cpp files from the inspector_instrumentation_sources list.
     "$blink_core_output_dir/InspectorConsoleInstrumentationInl.h",
+    "$blink_core_output_dir/InspectorInstrumentationImpl.cpp",
     "$blink_core_output_dir/InspectorInstrumentationInl.h",
     "$blink_core_output_dir/InspectorOverridesInl.h",
     "$blink_core_output_dir/InstrumentingAgentsInl.h",
-    "$blink_core_output_dir/InspectorInstrumentationImpl.cpp",
 
     # Additional .cpp files for SVG.
     "$blink_core_output_dir/SVGElementFactory.cpp",
@@ -426,9 +418,7 @@ source_set("core_generated") {
   configs -= core_config_remove
   configs += core_config_add
 
-  configs += [
-    "..:inside_blink",
-  ]
+  configs += [ "..:inside_blink" ]
 
   public_deps = [
     ":make_core_generated",
@@ -446,6 +436,7 @@ source_set("core_generated") {
     "//third_party/qcms",
     "//third_party/sqlite",
     "//third_party/WebKit/Source/bindings/core/v8:bindings_core_v8_generated",
+
     # FIXME: don't depend on bindings/modules http://crbug.com/358074
     "//third_party/WebKit/Source/bindings/modules:bindings_modules_generated",
     "//third_party/WebKit/Source/bindings/modules/v8:bindings_modules_generated",
@@ -457,12 +448,11 @@ source_set("core_generated") {
 
   configs += [
     ":core_include_dirs",
+
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
-  include_dirs = [
-    "$root_gen_dir/blink",
-  ]
+  include_dirs = [ "$root_gen_dir/blink" ]
 
   cflags = []
   defines = []
@@ -516,17 +506,18 @@ action("generated_settings_macros") {
   script = "../build/scripts/make_settings.py"
 
   inputs = scripts_for_in_files + [
-    "../build/scripts/make_settings.py",
-    "../build/scripts/templates/SettingsMacros.h.tmpl",
-    "frame/Settings.in",
-  ]
+             "../build/scripts/make_settings.py",
+             "../build/scripts/templates/SettingsMacros.h.tmpl",
+             "frame/Settings.in",
+           ]
   outputs = [
     "$blink_core_output_dir/SettingsMacros.h",
   ]
 
   args = [
     rebase_path("frame/Settings.in", root_build_dir),
-    "--output_dir", rel_blink_core_gen_dir,
+    "--output_dir",
+    rel_blink_core_gen_dir,
   ]
 }
 
@@ -535,12 +526,12 @@ action("generated_testing_idls_settings") {
   script = "../build/scripts/make_internal_settings.py"
 
   inputs = scripts_for_in_files + [
-    "../build/scripts/make_internal_settings.py",
-    "../build/scripts/templates/InternalSettingsGenerated.idl.tmpl",
-    "../build/scripts/templates/InternalSettingsGenerated.cpp.tmpl",
-    "../build/scripts/templates/InternalSettingsGenerated.h.tmpl",
-    "frame/Settings.in",
-  ]
+             "../build/scripts/make_internal_settings.py",
+             "../build/scripts/templates/InternalSettingsGenerated.idl.tmpl",
+             "../build/scripts/templates/InternalSettingsGenerated.cpp.tmpl",
+             "../build/scripts/templates/InternalSettingsGenerated.h.tmpl",
+             "frame/Settings.in",
+           ]
   outputs = [
     "$blink_core_output_dir/testing/InternalSettingsGenerated.idl",
     "$blink_core_output_dir/testing/InternalSettingsGenerated.cpp",
@@ -549,7 +540,8 @@ action("generated_testing_idls_settings") {
 
   args = [
     rebase_path("frame/Settings.in", root_build_dir),
-    "--output_dir", "$rel_blink_core_gen_dir/testing",
+    "--output_dir",
+    "$rel_blink_core_gen_dir/testing",
   ]
 }
 
@@ -558,11 +550,11 @@ action("generated_testing_idls_internal_runtime_flags") {
   script = "../build/scripts/make_internal_runtime_flags.py"
 
   inputs = scripts_for_in_files + [
-    "../build/scripts/make_internal_runtime_flags.py",
-    "../platform/RuntimeEnabledFeatures.in",
-    "../build/scripts/templates/InternalRuntimeFlags.h.tmpl",
-    "../build/scripts/templates/InternalRuntimeFlags.idl.tmpl",
-  ]
+             "../build/scripts/make_internal_runtime_flags.py",
+             "../platform/RuntimeEnabledFeatures.in",
+             "../build/scripts/templates/InternalRuntimeFlags.h.tmpl",
+             "../build/scripts/templates/InternalRuntimeFlags.idl.tmpl",
+           ]
   outputs = [
     "$blink_core_output_dir/testing/InternalRuntimeFlags.idl",
     "$blink_core_output_dir/testing/InternalRuntimeFlags.h",
@@ -570,7 +562,8 @@ action("generated_testing_idls_internal_runtime_flags") {
 
   args = [
     rebase_path("../platform/RuntimeEnabledFeatures.in", root_build_dir),
-    "--output_dir", "$rel_blink_core_gen_dir/testing",
+    "--output_dir",
+    "$rel_blink_core_gen_dir/testing",
   ]
 }
 
@@ -624,9 +617,7 @@ css_properties("make_core_generated_css_property_names") {
 # "MediaFeatures" in make_core_generated from GYP.
 process_in_files("make_core_generated_media_features") {
   script = "../build/scripts/make_media_features.py"
-  in_files = [
-    "css/MediaFeatureNames.in",
-  ]
+  in_files = [ "css/MediaFeatureNames.in" ]
   other_inputs = [
     "../build/scripts/make_media_features.py",
     "../build/scripts/templates/MediaFeatures.h.tmpl",
@@ -667,9 +658,7 @@ css_properties("make_core_generated_style_builder") {
 # "CSSPropertyMetadata" in make_core_generated from GYP.
 css_properties("make_core_generated_css_property_metadata") {
   script = "../build/scripts/make_css_property_metadata.py"
-  other_inputs = [
-    "../build/scripts/templates/CSSPropertyMetadata.cpp.tmpl",
-  ]
+  other_inputs = [ "../build/scripts/templates/CSSPropertyMetadata.cpp.tmpl" ]
   outputs = [
     "$blink_core_output_dir/CSSPropertyMetadata.cpp",
   ]
@@ -688,7 +677,8 @@ process_in_files("make_core_generated_css_value_keywords") {
     "$blink_core_output_dir/CSSValueKeywords.h",
   ]
   other_args = [
-    "--gperf", gperf_exe,
+    "--gperf",
+    gperf_exe,
   ]
 }
 
@@ -713,9 +703,7 @@ process_in_files("make_core_generated_html_element_factory") {
 process_in_files("make_core_generated_html_element_type_helpers") {
   script = "../build/scripts/make_element_type_helpers.py"
 
-  in_files = [
-    "html/HTMLTagNames.in",
-  ]
+  in_files = [ "html/HTMLTagNames.in" ]
   other_inputs = make_element_type_helpers_files
   outputs = [
     "$blink_core_output_dir/HTMLElementTypeHelpers.h",
@@ -743,9 +731,7 @@ process_in_files("make_core_generated_svg_names") {
 process_in_files("make_core_generated_svg_element_type_helpers") {
   script = "../build/scripts/make_element_type_helpers.py"
 
-  in_files = [
-    "svg/SVGTagNames.in",
-  ]
+  in_files = [ "svg/SVGTagNames.in" ]
   other_inputs = make_element_type_helpers_files
   outputs = [
     "$blink_core_output_dir/SVGElementTypeHelpers.h",
@@ -774,9 +760,7 @@ process_in_files("make_core_generated_event_factory") {
 # "MediaFeatureNames" in make_core_generated from GYP.
 process_in_files("make_core_generated_media_feature_names") {
   script = "../build/scripts/make_media_feature_names.py"
-  in_files = [
-    "css/MediaFeatureNames.in",
-  ]
+  in_files = [ "css/MediaFeatureNames.in" ]
   other_inputs = make_names_files
   outputs = [
     "$blink_core_output_dir/MediaFeatureNames.cpp",
@@ -786,9 +770,7 @@ process_in_files("make_core_generated_media_feature_names") {
 
 # "MediaTypeNames" in make_core_generated from GYP.
 make_names("make_core_generated_media_type_names") {
-  in_files = [
-    "css/MediaTypeNames.in",
-  ]
+  in_files = [ "css/MediaTypeNames.in" ]
   outputs = [
     "$blink_core_output_dir/MediaTypeNames.cpp",
     "$blink_core_output_dir/MediaTypeNames.h",
@@ -797,9 +779,7 @@ make_names("make_core_generated_media_type_names") {
 
 # "EventNames" in make_core_generated from GYP.
 make_names("make_core_generated_event_names") {
-  in_files = [
-    "$blink_core_output_dir/EventInterfaces.in",
-  ]
+  in_files = [ "$blink_core_output_dir/EventInterfaces.in" ]
   outputs = [
     "$blink_core_output_dir/EventNames.cpp",
     "$blink_core_output_dir/EventNames.h",
@@ -808,9 +788,7 @@ make_names("make_core_generated_event_names") {
 
 # "EventTargetNames" in make_core_generated from GYP.
 make_names("make_core_generated_event_target_names") {
-  in_files = [
-    "events/EventTargetFactory.in",
-  ]
+  in_files = [ "events/EventTargetFactory.in" ]
   outputs = [
     "$blink_core_output_dir/EventTargetNames.cpp",
     "$blink_core_output_dir/EventTargetNames.h",
@@ -819,9 +797,7 @@ make_names("make_core_generated_event_target_names") {
 
 # "FetchInitiatorTypeNames" in make_core_generated from GYP.
 make_names("make_core_generated_fetch_initiator_type_names") {
-  in_files = [
-    "fetch/FetchInitiatorTypeNames.in",
-  ]
+  in_files = [ "fetch/FetchInitiatorTypeNames.in" ]
   outputs = [
     "$blink_core_output_dir/fetch/FetchInitiatorTypeNames.cpp",
     "$blink_core_output_dir/fetch/FetchInitiatorTypeNames.h",
@@ -830,9 +806,7 @@ make_names("make_core_generated_fetch_initiator_type_names") {
 
 # "EventTypeNames" in make_core_generated from GYP.
 make_names("make_core_generated_event_type_names") {
-  in_files = [
-    "events/EventTypeNames.in",
-  ]
+  in_files = [ "events/EventTypeNames.in" ]
   outputs = [
     "$blink_core_output_dir/EventTypeNames.cpp",
     "$blink_core_output_dir/EventTypeNames.h",
@@ -841,9 +815,7 @@ make_names("make_core_generated_event_type_names") {
 
 # "HTMLTokenizerNames" in make_core_generated from GYP.
 make_names("make_core_generated_html_tokenizer_names") {
-  in_files = [
-    "html/parser/HTMLTokenizerNames.in",
-  ]
+  in_files = [ "html/parser/HTMLTokenizerNames.in" ]
   outputs = [
     "$blink_core_output_dir/HTMLTokenizerNames.cpp",
     "$blink_core_output_dir/HTMLTokenizerNames.h",
@@ -852,9 +824,7 @@ make_names("make_core_generated_html_tokenizer_names") {
 
 # "InputTypeNames" in make_core_generated from GYP.
 make_names("make_core_generated_input_type_names") {
-  in_files = [
-    "html/forms/InputTypeNames.in",
-  ]
+  in_files = [ "html/forms/InputTypeNames.in" ]
   outputs = [
     "$blink_core_output_dir/InputTypeNames.cpp",
     "$blink_core_output_dir/InputTypeNames.h",
@@ -877,9 +847,7 @@ make_qualified_names("make_core_generated_math_ml_names") {
 
 # "XLinkNames" in make_core_generated from GYP.
 make_qualified_names("make_core_generated_xlink_names") {
-  in_files = [
-    "svg/xlinkattrs.in",
-  ]
+  in_files = [ "svg/xlinkattrs.in" ]
   outputs = [
     "$blink_core_output_dir/XLinkNames.cpp",
     "$blink_core_output_dir/XLinkNames.h",
@@ -888,9 +856,7 @@ make_qualified_names("make_core_generated_xlink_names") {
 
 # "XMLNSNames" in make_core_generated from GYP.
 make_qualified_names("make_core_generated_xml_ns_names") {
-  in_files = [
-    "xml/xmlnsattrs.in",
-  ]
+  in_files = [ "xml/xmlnsattrs.in" ]
   outputs = [
     "$blink_core_output_dir/XMLNSNames.cpp",
     "$blink_core_output_dir/XMLNSNames.h",
@@ -899,9 +865,7 @@ make_qualified_names("make_core_generated_xml_ns_names") {
 
 # "XMLNames" in make_core_generated from GYP.
 make_qualified_names("make_core_generated_xml_names") {
-  in_files = [
-    "xml/xmlattrs.in",
-  ]
+  in_files = [ "xml/xmlattrs.in" ]
   outputs = [
     "$blink_core_output_dir/XMLNames.cpp",
     "$blink_core_output_dir/XMLNames.h",
@@ -948,8 +912,8 @@ action("make_core_generated_private_script_for_testing") {
   script = "../build/scripts/make_private_script_source.py"
 
   inputs = [
-      "testing/PartialPrivateScriptTest.js",
-      "testing/PrivateScriptTest.js",
+    "testing/PartialPrivateScriptTest.js",
+    "testing/PrivateScriptTest.js",
   ]
   outputs = [
     "$blink_core_output_dir/PrivateScriptSourcesForTesting.h",
@@ -992,7 +956,8 @@ action("make_core_generated_css_tokenizer_codepoints") {
   ]
 
   args = [
-    "--output_dir", rel_blink_core_gen_dir,
+    "--output_dir",
+    rel_blink_core_gen_dir,
   ]
 
   deps = make_core_generated_deps
@@ -1006,10 +971,10 @@ action("make_core_generated_html_element_lookup_trie") {
 
   input_file = "html/HTMLTagNames.in"
   inputs = scripts_for_in_files + [
-    input_file,
-    "../build/scripts/templates/ElementLookupTrie.cpp.tmpl",
-    "../build/scripts/templates/ElementLookupTrie.h.tmpl",
-  ]
+             input_file,
+             "../build/scripts/templates/ElementLookupTrie.cpp.tmpl",
+             "../build/scripts/templates/ElementLookupTrie.h.tmpl",
+           ]
   outputs = [
     "$blink_core_output_dir/HTMLElementLookupTrie.cpp",
     "$blink_core_output_dir/HTMLElementLookupTrie.h",
@@ -1017,7 +982,8 @@ action("make_core_generated_html_element_lookup_trie") {
 
   args = [
     rebase_path(input_file, root_build_dir),
-    "--output_dir", rel_blink_core_gen_dir,
+    "--output_dir",
+    rel_blink_core_gen_dir,
   ]
 
   deps = make_core_generated_deps