[Chromecast] Add /system/chrome to the rpath for component builds.

build/config/chromecast/BUILD.gn

 # Copyright 2015 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/chromecast_build.gni")
 
 assert(is_chromecast)
 
 config("static_config") {
   ldflags = [
@@ skipping 19 matching lines @@
   # Chromecast executables depend on several shared libraries in
   # /oem_cast_shlib, $ORIGIN, and $ORIGIN/lib. Add these rpaths to each binary.
   # This is explicitly disabled in Chrome for security reasons (see comments in
   # //build/config/gcc/BUILD.gn), but necessary on Chromecast so that OEM's may
   # override the default libraries shipped in the Cast receiver package.
   ldflags = [
     "-Wl,-rpath=/oem_cast_shlib",
     "-Wl,-rpath=\$ORIGIN/lib",
     "-Wl,-rpath=\$ORIGIN",
   ]
+
+  # Binaries which don't live in the same directory as Chrome component
+  # libraries may still depend on them. Explicitly add the component library
+  # directory to the rpath for the component build.
+  if (is_component_build) {
+    ldflags += [ "-Wl,-rpath=/system/chrome" ]
+  }
 }
 
 config("executable_config") {
   configs = [ ":ldconfig" ]
 
   if (current_cpu == "arm") {
     ldflags = [
       # Export stdlibc++ and libgcc symbols to force shlibs to refer to these
       # symbols from the executable.
       "-Wl,--export-dynamic",
@@ skipping 15 matching lines @@
     configs += [ ":static_config" ]
   }
 }
 
 config("shared_library_config") {
   configs = [ ":ldconfig" ]
   if (current_cpu == "arm") {
     configs += [ ":static_config" ]
   }
 }