Specify -install_name of target within solink.

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 2ef06d569fa37b90522e598f0a0d693f8bbfffcb..e8fe8040600e9bca16b5a52187ba16dec1ce881b 100644
--- a/build/toolchain/mac/BUILD.gn
+++ b/build/toolchain/mac/BUILD.gn
@@ -117,7 +117,7 @@ template("mac_toolchain") {
       # These variables are not built into GN but are helpers that implement
       # (1) linking to produce a .so, (2) extracting the symbols from that file
       # to a temporary file, (3) if the temporary file has differences from the
-      # existing .TOC file, overwrite it, oterwise, don't change it.
+      # existing .TOC file, overwrite it, otherwise, don't change it.
       #
       # As a special case, if the library reexports symbols from other dynamic
       # libraries, we always update the .TOC and skip the temporary file and
@@ -126,7 +126,13 @@ template("mac_toolchain") {
       temporary_tocname = dylib + ".tmp"
 
       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 {{solibs}} {{libs}}"
+
+      link_command = "$ld -shared {{ldflags}} -o $dylib -Wl,-filelist,$rspfile"
+      if (is_component_build) {
+        link_command += " -Wl,-install_name,@rpath/{{target_output_name}}{{output_extension}}"
+      }
+      link_command += " {{solibs}} {{libs}}"
+
       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; }"