Replicate to all renderers the accepted languages set by a layout test.

components/test_runner/test_runner.cc

Index: components/test_runner/test_runner.cc
diff --git a/components/test_runner/test_runner.cc b/components/test_runner/test_runner.cc
index 60fa315e8bb048352a952547f747d8d17e468600..ad6cd5caa6d66e47fa20360312186c4827dae658 100644
--- a/components/test_runner/test_runner.cc
+++ b/components/test_runner/test_runner.cc
@@ -2653,8 +2653,17 @@ void TestRunner::OverridePreference(const std::string& key,
   delegate_->ApplyPreferences();
 }
 
+std::string TestRunner::GetAcceptLanguages() const {
+  return layout_test_runtime_flags_.accept_languages();
+}
+
 void TestRunner::SetAcceptLanguages(const std::string& accept_languages) {
-  proxy_->SetAcceptLanguages(accept_languages);
+  if (accept_languages == GetAcceptLanguages())
+    return;

[Łukasz Anforowicz, 2016/03/25 14:37:59]

Turns out that we really need to copy this check from WebTestProxyBase -
otherwise we get a failure in navigator_language/navigator_language.html.
Initially I thought that it is weird that a test ends up testing the code of
test harness, not what the product does, but I guess doing this check inside
WebView is difficult, because it doesn't know what the previous value was.

+
+  layout_test_runtime_flags_.set_accept_languages(accept_languages);
+  OnLayoutTestRuntimeFlagsChanged();
+  proxy_->GetWebView()->acceptLanguagesChanged();
 }
 
 void TestRunner::SetPluginsEnabled(bool enabled) {