Add hw_video_decode_mac flag for Flash 15.0.0.223.

content/browser/ppapi_plugin_process_host.cc

Index: content/browser/ppapi_plugin_process_host.cc
diff --git a/content/browser/ppapi_plugin_process_host.cc b/content/browser/ppapi_plugin_process_host.cc
index 22b69ba76d2348815d348878731f2f158cc3c95a..4f3491266220b18ae625c4a9b5ca5289bcb7b4e0 100644
--- a/content/browser/ppapi_plugin_process_host.cc
+++ b/content/browser/ppapi_plugin_process_host.cc
@@ -341,6 +341,10 @@ bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
       if (!existing_args.empty())
         existing_args.append(",");
       existing_args.append("enable_hw_video_decode=1");
+#if defined(OS_MACOSX)
+      // TODO(ihf): Remove this once Flash newer than 15.0.0.223 is released.
+      existing_args.append(",enable_hw_video_decode_mac=1");
+#endif
     }
     cmd_line->AppendSwitchASCII(switches::kPpapiFlashArgs, existing_args);
   }