Add a NoStatePrefetch entry in about://flags

chrome/browser/prerender/prerender_field_trial.h

Index: chrome/browser/prerender/prerender_field_trial.h
diff --git a/chrome/browser/prerender/prerender_field_trial.h b/chrome/browser/prerender/prerender_field_trial.h
index 1e1e8e66de5c38cec8e84f3584fea235c5cf8387..ce5a487853087fc41ec8603ff3fa07d448cecca1 100644
--- a/chrome/browser/prerender/prerender_field_trial.h
+++ b/chrome/browser/prerender/prerender_field_trial.h
@@ -11,9 +11,10 @@ class Profile;
 
 namespace prerender {
 
-// Exposed for testing.
 extern const base::Feature kNoStatePrefetchFeature;
 extern const char kNoStatePrefetchFeatureModeParameterName[];
+extern const char kNoStatePrefetchFeatureModeParameterPrefetch[];

[Alexei Svitkine (slow), 2016/12/07 15:50:00]

Is there a corresponding .cc file change missing from the CL?

[droger, 2016/12/07 15:55:30]

No, these constants already exist, they just were made public in this CL.

Note that they were not in anonymous namespace (as they should have been),
that's why there is no change needed to the cc file.

+extern const char kNoStatePrefetchFeatureModeParameterPrerender[];
 extern const char kNoStatePrefetchFeatureModeParameterSimpleLoad[];
 
 // Configures prerender using kNoStatePrefetchFeature and field trial