Plugin Power Saver: Implement srcset syntax for posters.

chrome/renderer/plugins/plugin_preroller.cc

Index: chrome/renderer/plugins/plugin_preroller.cc
diff --git a/chrome/renderer/plugins/plugin_preroller.cc b/chrome/renderer/plugins/plugin_preroller.cc
index 618a7c340bf2f3a318318aa946e4664f8950734b..a98e77738da7197950fa75940b9b1f579f0c6a98 100644
--- a/chrome/renderer/plugins/plugin_preroller.cc
+++ b/chrome/renderer/plugins/plugin_preroller.cc
@@ -61,7 +61,7 @@ void PluginPreroller::OnThrottleStateChange() {
   ChromePluginPlaceholder* placeholder =
       ChromePluginPlaceholder::CreateBlockedPlugin(
           render_frame(), frame_, params_, info_, identifier_, name_,
-          IDR_PLUGIN_POSTER_HTML, message_, keyframe_data_url_);
+          IDR_PLUGIN_POSTER_HTML, message_, keyframe_data_url_.spec(), GURL());
   placeholder->SetPremadePlugin(throttler_);
   placeholder->set_power_saver_enabled(true);
   placeholder->set_allow_loading(true);