Plugin Power Saver Tiny: Treat completely obscured plugins as Tiny.

components/plugins/renderer/loadable_plugin_placeholder.cc

Index: components/plugins/renderer/loadable_plugin_placeholder.cc
diff --git a/components/plugins/renderer/loadable_plugin_placeholder.cc b/components/plugins/renderer/loadable_plugin_placeholder.cc
index 4f1303cbfa1456d732b629b572843ac6ee1ee31c..c7ac35ba7e56ffd9b565a8e3c292a43463c18f60 100644
--- a/components/plugins/renderer/loadable_plugin_placeholder.cc
+++ b/components/plugins/renderer/loadable_plugin_placeholder.cc
@@ -213,7 +213,8 @@ void LoadablePluginPlaceholder::OnUnobscuredRectUpdate(
 
   // Early exit for plugins that we've discovered to be essential.
   if (!plugin_is_tiny_and_blocked &&
-      status != RenderFrame::CONTENT_STATUS_PERIPHERAL) {
+      status != RenderFrame::CONTENT_STATUS_PERIPHERAL &&
+      status != RenderFrame::CONTENT_STATUS_TINY) {
     MarkPluginEssential(
         heuristic_run_before_
             ? PluginInstanceThrottler::UNTHROTTLE_METHOD_BY_SIZE_CHANGE