Linux/CrOS smooth scrolling support - behind a flag.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index b1f74dd6d9f95b1ee1a2ddead5a1f411daaad2f6..b667a0f1047dc91533e710e1983c2867f90f690e 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -479,6 +479,9 @@ const char kEnablePreconnect[]              = "enable-preconnect";
 // parameter to indicate if the provider should be the default.
 const char kEnableSearchProviderApiV2[]     = "enable-search-provider-api-v2";
 
+// On platforms that support it, enable smooth scroll animation.
+const char kEnableSmoothScrolling[]         = "enable-smooth-scrolling";
+
 // Enables TLS cached info extension.
 const char kEnableSSLCachedInfo[]  = "enable-ssl-cached-info";