Turn off SiteIsolationPolicy::AreCrossProcessFramesPossible for Android.

content/common/site_isolation_policy.cc

Index: content/common/site_isolation_policy.cc
diff --git a/content/common/site_isolation_policy.cc b/content/common/site_isolation_policy.cc
index a1607c84caf590d76586f467d1c0f2ff9867fb3a..79bc3f0852a75d8f19552c09c8367bde986fdc65 100644
--- a/content/common/site_isolation_policy.cc
+++ b/content/common/site_isolation_policy.cc
@@ -11,7 +11,14 @@ namespace content {
 
 // static
 bool SiteIsolationPolicy::AreCrossProcessFramesPossible() {
+// Before turning this on for Android, input event routing needs to be
+// completed there, and perf regressions in https://crbug.com/690229 need to be
+// investigated.
+#if defined(OS_ANDROID)
+  return false;

[nasko, 2017/02/09 21:05:25]

Shouldn't this be the old code that we removed? It should still be conditional
on whether we run in --site-per-process.

[alexmos, 2017/02/09 21:42:31]

Indeed!  Thanks for catching, and I'm glad the bots caught it too.  Fixed now.

+#else
   return true;
+#endif
 }
 
 // static