Add touch scrolling modes experimental flags

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 0c1336c63d9272f9726b6aed1b2990d50b8915bb..c42a501e1a42245422f943c96866a1787399a1cd 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -884,6 +884,11 @@ const char kTestSandbox[]                   = "test-sandbox";
 // If unspecified, touch timeout behavior will be disabled.
 const char kTouchAckTimeoutDelayMs[]        = "touch-ack-timeout-delay-ms";
 
+const char kTouchScrollingMode[]            = "touch-scrolling-mode";
+const char kTouchScrollingModeTouchcancel[] = "touchcancel";
+const char kTouchScrollingModeSyncTouchmove[] = "sync-touchmove";
+const char kTouchScrollingModeAbsorbTouchmove[] = "absorb-touchmove";
+
 // 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.