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

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 22eca26536bb117a79c111c6cd2abf75d76a0d65..70c7179de57469f3c449a2ef7ced437b2daf540b 100644
--- a/third_party/WebKit/Source/core/BUILD.gn
+++ b/third_party/WebKit/Source/core/BUILD.gn
@@ -5,6 +5,7 @@
 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")
@@ -69,6 +70,20 @@ config("core_include_dirs") {
   }
 }
 
+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 = [
@@ -188,7 +203,7 @@ component("core") {
 }
 
 # 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
@@ -203,7 +218,7 @@ source_set("dom") {
 }
 
 # 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
@@ -215,7 +230,7 @@ source_set("html") {
 }
 
 # 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
@@ -227,7 +242,13 @@ source_set("svg") {
 }
 
 # 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
@@ -336,7 +357,7 @@ source_set("testing") {
 }
 
 # 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