ninja: Add target_rpath generator flag

test/linux/gyptest-target-rpath.py

Index: test/linux/gyptest-target-rpath.py
diff --git a/test/linux/gyptest-implicit-rpath.py b/test/linux/gyptest-target-rpath.py
similarity index 71%
copy from test/linux/gyptest-implicit-rpath.py
copy to test/linux/gyptest-target-rpath.py
index dd7718c76dbf9209c6cb2fec3a622811abe7230e..2950a2026a2f8e83de593a42fde546638c6221bf 100644
--- a/test/linux/gyptest-implicit-rpath.py
+++ b/test/linux/gyptest-target-rpath.py
@@ -5,7 +5,7 @@
 # found in the LICENSE file.
 
 """
-Verifies that the implicit rpath is added only when needed.
+Check target_rpath generator flag for ninja.
 """
 
 import TestGyp
@@ -15,10 +15,10 @@ import subprocess
 import sys
 
 if sys.platform.startswith('linux'):
-  test = TestGyp.TestGyp(formats=['ninja', 'make'])
+  test = TestGyp.TestGyp(formats=['ninja'])
 
-  CHDIR = 'implicit-rpath'
-  test.run_gyp('test.gyp', chdir=CHDIR)
+  CHDIR = 'target-rpath'
+  test.run_gyp('test.gyp', '-G', 'target_rpath=/usr/lib/gyptest/', chdir=CHDIR)
   test.build('test.gyp', test.ALL, chdir=CHDIR)
 
   def GetRpaths(p):
@@ -29,12 +29,7 @@ if sys.platform.startswith('linux'):
     assert not proc.returncode
     return r.findall(o)
 
-  if test.format == 'ninja':
-    expect = '$ORIGIN/lib/'
-  elif test.format == 'make':
-    expect = '$ORIGIN/lib.target/'
-  else:
-    test.fail_test()
+  expect = '/usr/lib/gyptest/'
 
   if GetRpaths('shared_executable') != [expect]:
     test.fail_test()