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..cf3b054e060da5b73f7cc6ade2c0b3eeafc64f60 100644
--- a/chrome/renderer/plugins/plugin_preroller.cc
+++ b/chrome/renderer/plugins/plugin_preroller.cc
@@ -51,7 +51,7 @@ void PluginPreroller::OnKeyframeExtracted(const SkBitmap* bitmap) {
   std::string data_url_header = "data:image/png;base64,";
   std::string data_url_body;
   base::Base64Encode(png_as_string, &data_url_body);
-  keyframe_data_url_ = GURL(data_url_header + data_url_body);
+  keyframe_data_url_ = data_url_header + data_url_body;
 }
 
 void PluginPreroller::OnThrottleStateChange() {
@@ -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_, GURL());
   placeholder->SetPremadePlugin(throttler_);
   placeholder->set_power_saver_enabled(true);
   placeholder->set_allow_loading(true);