lib32/ doesn't exist on OSX x64 build. Update browser_tests accordingly.

Add nexe to isolate_driver.py.

R=vadimsh@chromium.org
BUG=415188

Review URL: https://codereview.chromium.org/574753004

Cr-Commit-Position: refs/heads/master@{#296991}

chrome/browser_tests.isolate

@@ -107,18 +107,24 @@
           '<(PRODUCT_DIR)/content_shell.pak',
           '<(PRODUCT_DIR)/libclearkeycdm.dylib',
           '<(PRODUCT_DIR)/osmesa.so',
-          '<(PRODUCT_DIR)/ppapi_nacl_tests_glibc_x32.nexe',
-          '<(PRODUCT_DIR)/ppapi_nacl_tests_newlib_x32.nexe',
-          '<(PRODUCT_DIR)/ppapi_nacl_tests_pnacl_newlib_x32.nexe',
           '<(PRODUCT_DIR)/ppapi_tests.plugin/Contents/MacOS/ppapi_tests',
         ],
         'isolate_dependency_untracked': [
-          '<(PRODUCT_DIR)/lib32/',
           '<(PRODUCT_DIR)/plugins/npapi_test_plugin.plugin/',
           '<(PRODUCT_DIR)/plugins/test_netscape_plugin.plugin/',
         ],
       },
     }],
+    ['OS=="mac" and target_arch=="ia32"', {
+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/lib32/',
+          '<(PRODUCT_DIR)/ppapi_nacl_tests_glibc_x32.nexe',
+          '<(PRODUCT_DIR)/ppapi_nacl_tests_newlib_x32.nexe',
+          '<(PRODUCT_DIR)/ppapi_nacl_tests_pnacl_newlib_x32.nexe',
+        ],
+      },
+    }],
     ['OS=="mac" or OS=="win"', {
       'variables': {
         'command': [

tools/isolate_driver.py

@@ -180,7 +180,7 @@ def post_process_deps(build_dir, dependencies):
     # This script is only for adding new binaries that are created as part of
     # the component build.
     ext = os.path.splitext(i)[1]
-    if ext not in ['.dll', '.so', '.dylib']:
+    if ext not in ['.dll', '.nexe', '.so', '.dylib']:
       return False
 
     # Check for execute access and strip directories. This gets rid of all the