Add touch scrolling modes experimental flags (DEPRECATED)

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 5789ba1d6e4b3e99f5d35479e4455570487a8310..d1ebdf648f6f3c97eb23755af4b0d0874eb6ff97 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -881,6 +881,11 @@ 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.