Disable WebShare on platforms other than android.

third_party/WebKit/Source/build/scripts/make_runtime_features.py

Index: third_party/WebKit/Source/build/scripts/make_runtime_features.py
diff --git a/third_party/WebKit/Source/build/scripts/make_runtime_features.py b/third_party/WebKit/Source/build/scripts/make_runtime_features.py
index 068c53d2734dc8a020f7dd4502c3ce593ac80ff9..d3f3fe12f17cc3f68949e22a19b492803200f178 100755
--- a/third_party/WebKit/Source/build/scripts/make_runtime_features.py
+++ b/third_party/WebKit/Source/build/scripts/make_runtime_features.py
@@ -49,6 +49,7 @@ class RuntimeFeatureWriter(in_generator.Writer):
         'feature_policy': None,
         'implied_by': [],
         'origin_trial_feature_name': None,
+        'origin_trial_os_whitelist': [],

[dglazkov, 2016/09/29 15:59:47]

just origin_trial_os? Also, will you need to modify this again a feature exits
origin trials?

Could this be somehow orthogonal to origin trial flags?

[Sam McNally, 2016/10/04 01:54:03]

Done.
When the origin trial ends, the previous approach for restricting platforms will
work again.
Runtime features are either on or off and origin trials can turn an off into an
on. To merge this into the existing per-platform controls we'd need another
state for runtime features that isn't affected by origin trials.

         'settable_from_internals': False,
         'status': None,
     }