Reland of Shrink gn's chrome.dll - now smaller than gyp's

third_party/WebKit/Source/core/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/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/ui.gni")
+import("//build/split_static_library.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/bindings/core/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/modules/modules.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
 
@@ skipping 44 matching lines @@
 config("core_include_dirs") {
   include_dirs = [
     "..",
     "$root_gen_dir/blink",
   ]
   if (is_android && use_openmax_dl_fft) {
     include_dirs += [ "//third_party/openmax_dl" ]
   }
 }
 
+if (is_component_build) {
+  link_target_type = "source_set"
+} else {
+  link_target_type = "split_static_library"
+
+  if (is_win && is_official_build) {
+    # Shard this target into parts to work around linker limitations
+    # on link time code generation builds.
+    split_count = 5
+  } else {
+    split_count = 1
+  }
+}
+
 # GYP version: WebKit/Source/core/core.gyp:webcore_generated
 source_set("generated") {
   deps = [
     ":make_core_generated",
     ":prerequisites",
     "inspector:instrumentation_sources",
     "inspector:protocol_sources",
     "//gin",
     "//skia",
     "//third_party/WebKit/Source/bindings/core/v8:bindings_core_v8_generated",
@@ skipping 99 matching lines @@
     # Incremental linking doesn't work on this target in debug mode, even
     # with symbol_level=1.
     configs -= [ "//build/config/win:default_incremental_linking" ]
     configs += [ "//build/config/win:no_incremental_linking" ]
   }
 
   public_configs = [ ":core_include_dirs" ]
 }
 
 # GYP version: //third_party/WebKit/Source/core/core.gyp:webcore_dom
-source_set("dom") {
+target(link_target_type, "dom") {
   sources = rebase_path(webcore_dom_files, ".", "//")
 
   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",
              ]
 
   deps = [
     ":prerequisites",
   ]
 }
 
 # GYP version: //third_party/WebKit/Source/core/core.gyp:webcore_html
-source_set("html") {
+target(link_target_type, "html") {
   sources = rebase_path(webcore_html_files, ".", "//")
 
   configs -= core_config_remove
   configs += core_config_add
 
   deps = [
     ":prerequisites",
   ]
 }
 
 # GYP version: //third_party/WebKit/Source/core/core.gyp:webcore_svg
-source_set("svg") {
+target(link_target_type, "svg") {
   sources = rebase_path(webcore_svg_files, ".", "//")
 
   configs -= core_config_remove
   configs += core_config_add
 
   deps = [
     ":prerequisites",
   ]
 }
 
 # GYP version: //third_party/WebKit/Source/core/core.gyp:webcore_remaining
-source_set("remaining") {
+target(link_target_type, "remaining") {
+  if (is_win && is_official_build) {
+    # Shard this target into parts to work around linker limitations
+    # on link time code generation builds.
+    split_count = 19
+  }
+
   # This is currently a mashup of "webcore_rendering" and "webcore_remaining"
   # in GYP. The file list variable is the same and then GYP filters on wether
   # the path starts with "rendering/" or not. We should tweak the .gypis a bit
   # to separate out the rendering files.
   sources = rebase_path(webcore_non_rendering_files, ".", "//")
   sources += rebase_path(webcore_rendering_files, ".", "//")
 
   configs -= core_config_remove
   configs += core_config_add + [
                # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
@@ skipping 88 matching lines @@
     "$bindings_core_v8_output_dir/V8TypeConversions.cpp",
     "$bindings_core_v8_output_dir/V8TypeConversions.h",
     "$bindings_core_v8_output_dir/V8UnionTypesTest.cpp",
     "$bindings_core_v8_output_dir/V8UnionTypesTest.h",
     "$bindings_core_v8_output_dir/V8WorkerInternals.cpp",
     "$bindings_core_v8_output_dir/V8WorkerInternals.h",
   ]
 }
 
 # GYP version: //third_party/WebKit/Source/core/core.gyp:webcore_generated
-source_set("core_generated") {
+target(link_target_type, "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
 
@@ skipping 734 matching lines @@
     "$blink_core_output_dir/{{source_name_part}}.h",
   ]
   args = [
     "{{source}}",
     rel_blink_core_gen_dir,
     bison_exe,
   ]
 
   deps = make_core_generated_deps
 }