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..b3db97ede58b4a304fa8f37b0a76786b1d864658 100644
--- a/content/common/site_isolation_policy.cc
+++ b/content/common/site_isolation_policy.cc
@@ -5,13 +5,26 @@
 #include "content/common/site_isolation_policy.h"
 
 #include "base/command_line.h"
+#include "base/feature_list.h"
+#include "content/public/common/content_client.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 
 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 UseDedicatedProcessesForAllSites() ||
+         IsTopDocumentIsolationEnabled() ||
+         GetContentClient()->IsSupplementarySiteIsolationModeEnabled() ||
+         base::FeatureList::IsEnabled(::features::kGuestViewCrossProcessFrames);
+#else
   return true;
+#endif
 }
 
 // static