[Mac/GN] Set up the component build.

build/toolchain/mac/BUILD.gn

Index: build/toolchain/mac/BUILD.gn
diff --git a/build/toolchain/mac/BUILD.gn b/build/toolchain/mac/BUILD.gn
index 571865c7fd3b277b578bca7e153e3315959c659f..931f6657fb214e233caaabd38d30b92482f98186 100644
--- a/build/toolchain/mac/BUILD.gn
+++ b/build/toolchain/mac/BUILD.gn
@@ -138,12 +138,11 @@ template("mac_toolchain") {
 
       does_reexport_command = "[ ! -e \"$dylib\" -o ! -e \"$tocname\" ] || otool -l \"$dylib\" | grep -q LC_REEXPORT_DYLIB"
 
-      link_command =
-          "$ld -shared {{ldflags}} -o \"$dylib\" -Wl,-filelist,\"$rspfile\""
+      link_command = "$ld -shared "
       if (is_component_build) {
-        link_command += " -Wl,-install_name,@rpath/{{target_output_name}}{{output_extension}}"
+        link_command += " -Wl,-install_name,@rpath/\"{{target_output_name}}{{output_extension}}\" "
       }
-      link_command += " {{solibs}} {{libs}}"
+      link_command += "{{ldflags}} -o \"$dylib\" -Wl,-filelist,\"$rspfile\" {{libs}} {{solibs}}"
 
       replace_command = "if ! cmp -s \"$temporary_tocname\" \"$tocname\"; then mv \"$temporary_tocname\" \"$tocname\""
       extract_toc_command = "{ otool -l \"$dylib\" | grep LC_ID_DYLIB -A 5; nm -gP \"$dylib\" | cut -f1-2 -d' ' | grep -v U\$\$; true; }"