Move TouchEvent timeout code to the TouchEventQueue

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 3a9553fc526f924c81e7b3cf1be25934fa5ed3f4..f7773a22b173ee1a32b23e7de31a70f3160ba612 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -856,6 +856,10 @@ const char kTestingFixedHttpsPort[]         = "testing-fixed-https-port";
 // Runs the security test for the renderer sandbox.
 const char kTestSandbox[]                   = "test-sandbox";
 
+// Enable timeout-based touch event cancellation if a touch ack is delayed.
+// If unspecified, touch timeout behavior will be disabled.
+const char kTouchAckTimeoutDelayMs[]        = "touch-ack-timeout-delay-ms";
+
 // Causes TRACE_EVENT flags to be recorded beginning with shutdown. Optionally,
 // can specify the specific trace categories to include (e.g.
 // --trace-shutdown=base,net) otherwise, all events are recorded.