Field trials are currently implemented (commonly) using a static variable that is set

once, the first time it is necessary to decide if there is an experiment by a given 
name active.

With this change the field-test system can "push" a group that is selected for 
the given field trial (field test) if/when an experiment does arrive.

This change implements a simple IPC notification of the result of a FieldTrial
setting being sent to any previously started renderers.

BUG=16494
TEST=field trial tests
R=jar
Review URL: http://codereview.chromium.org/6883029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@83488 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 0 deletions

diff --git a/chrome/renderer/chrome_render_process_observer.h b/chrome/renderer/chrome_render_process_observer.h
index d40b502..844440b 100644
--- a/chrome/renderer/chrome_render_process_observer.h
+++ b/chrome/renderer/chrome_render_process_observer.h
@@ -6,6 +6,8 @@
 #define CHROME_RENDERER_CHROME_RENDER_PROCESS_OBSERVER_H_
 #pragma once
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "content/renderer/render_process_observer.h"
 
@@ -35,6 +37,8 @@ class ChromeRenderProcessObserver : public RenderProcessObserver {
                             size_t capacity);
   void OnClearCache();
   void OnGetCacheResourceStats();
+  void OnSetFieldTrialGroup(const std::string& fiel_trial_name,
+                            const std::string& group_name);
   void OnGetRendererTcmalloc();
   void OnGetV8HeapStats();
   void OnPurgeMemory();