Add --disable-compositor-touch-hit-testing flag

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index 7c9e684fe8c4d55ba437fb80bf6cf7e8930beb95..763a24713a88f2fb483845c5ada85df56fba72b0 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -75,6 +75,9 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   // Enable D-PAD navigation for application compatibility.
   cl->AppendSwitch(switches::kEnableSpatialNavigation);
 
+  // Disable compositor touch hit testing for now to mitigate risk of bugs.
+  cl->AppendSwitch(cc::switches::kDisableCompositorTouchHitTesting);
+
   // Disable WebRTC.
   cl->AppendSwitch(switches::kDisableWebRTC);