content_browsertests.isolate: ppapi_tests requires enable_plugins=1.

R=cjhopman@chromium.org,maruel@chromium.org
BUG=472823

Review URL: https://codereview.chromium.org/1057153002

Cr-Original-Commit-Position: refs/heads/master@{#323826}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7623ad7130f4beb954b00192f8009de208ca84c0

android/pylib/utils/isolator.py

@@ -30,6 +30,7 @@ def DefaultConfigVariables():
     'asan': '0',
     'chromeos': '0',
     'component': 'static_library',
+    'enable_plugins': '0',
     'fastbuild': '0',
     'icu_use_data_file_flag': '1',
     'lsan': '0',

isolate.gypi

@@ -80,6 +80,7 @@
         '--config-variable', 'chromeos=<(chromeos)',
         '--config-variable', 'component=<(component)',
         '--config-variable', 'disable_nacl=<(disable_nacl)',
+        '--config-variable', 'enable_plugins=<(enable_plugins)',
         '--config-variable', 'fastbuild=<(fastbuild)',
         '--config-variable', 'icu_use_data_file_flag=<(icu_use_data_file_flag)',
         # TODO(kbr): move this to chrome_tests.gypi:gles2_conform_tests_run