This change enables FieldTrial for SPDY. When --use-spdy=npn is used, field test won't be enabled.

However, when that flag is missing, A/B test is added to browser_main.cc. Trial A: use npn and spdy. B: use npn but no spdy. C: do nothing. A and B are set to zero for now
The histograms we collect are: 
1. Page begin to finish time when spdy is enabled/disabled across all sites;
2. Page begin to finish time when spdy is used on sites that support spdy and when spdy is intentionally ignored. 


BUG=43997
TEST=Don't use --use-spdy=npn, manually change _npn_nospdy and _npn_withspdy percentile and go to spdy supported sites.

Review URL: http://codereview.chromium.org/2036012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@47896 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 1 deletions

diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index e1f8791..ab0dcc1 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -1327,6 +1327,7 @@ struct ParamTraits<webkit_glue::ResourceLoaderBridge::ResponseInfo> {
     WriteParam(m, p.appcache_id);
     WriteParam(m, p.appcache_manifest_url);
     WriteParam(m, p.was_fetched_via_spdy);
+    WriteParam(m, p.was_npn_negotiated);
   }
   static bool Read(const Message* m, void** iter, param_type* r) {
     return
@@ -1339,7 +1340,8 @@ struct ParamTraits<webkit_glue::ResourceLoaderBridge::ResponseInfo> {
       ReadParam(m, iter, &r->content_length) &&
       ReadParam(m, iter, &r->appcache_id) &&
       ReadParam(m, iter, &r->appcache_manifest_url) &&
-      ReadParam(m, iter, &r->was_fetched_via_spdy);
+      ReadParam(m, iter, &r->was_fetched_via_spdy) &&
+      ReadParam(m, iter, &r->was_npn_negotiated);
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(L"(");
@@ -1362,6 +1364,8 @@ struct ParamTraits<webkit_glue::ResourceLoaderBridge::ResponseInfo> {
     LogParam(p.appcache_manifest_url, l);
     l->append(L", ");
     LogParam(p.was_fetched_via_spdy, l);
+    l->append(L",");
+    LogParam(p.was_npn_negotiated, l);
     l->append(L")");
   }
 };