Supporting command line argument to force field trials

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 445cb90f8b6a9b0485f380325670137a8a7c61a5..b17eab40f0b7ab6ec48e0cece46cb7d612b922f4 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -369,16 +369,14 @@ const char kExtraPluginDir[]                = "extra-plugin-dir";
 // the base layer even when compositing is not strictly required.
 const char kForceCompositingMode[]          = "force-compositing-mode";
 
-// Some field tests may rendomized in the browser, and the randomly selected
-// outcome needs to be propagated to the renderer.  For instance, this is used
+// Some field tests may be randomized in the browser, and the randomly selected
+// outcome needs to be propagated to the renderer. For instance, this is used
 // to modify histograms recorded in the renderer, or to get the renderer to
 // also set of its state (initialize, or not initialize components) to match the
-// experiment(s).
-// The argument is a string-ized list of experiment names, and the associated
-// value that was randomly selected.  In the recent implementetaion, the
-// persistent representation generated by field_trial.cc and later decoded, is a
-// list of name and value pairs, separated by slashes. See field trial.cc for
-// current details.
+// experiment(s). The option is also useful for forcing field trials when
+// testing changes locally. The argument is a list of name and value pairs,
+// separated by slashes. See FieldTrialList::CreateTrialsFromString() in
+// field_trial.h for details.
 const char kForceFieldTestNameAndValue[]    = "force-fieldtest";
 
 // Force renderer accessibility to be on instead of enabling it on demand when