Propogate the UI language on the command line and expose to Flash.

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 de2770af6dc5eea6371afec005aa803814bccd7e..92d7e4e5428ae9bade8ff556d23bd79a56a7a74c 100644
--- a/content/browser/ppapi_plugin_process_host.cc
+++ b/content/browser/ppapi_plugin_process_host.cc
@@ -16,12 +16,14 @@
 #include "content/browser/renderer_host/render_message_filter.h"
 #include "content/common/child_process_host_impl.h"
 #include "content/common/child_process_messages.h"
+#include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/pepper_plugin_info.h"
 #include "content/public/common/process_type.h"
 #include "ipc/ipc_switches.h"
 #include "net/base/network_change_notifier.h"
 #include "ppapi/proxy/ppapi_messages.h"
+#include "ui/base/ui_base_switches.h"
 #include "webkit/plugins/plugin_switches.h"
 
 using content::ChildProcessHost;
@@ -189,6 +191,13 @@ bool PpapiPluginProcessHost::Init(const content::PepperPluginInfo& info) {
                                arraysize(kPluginForwardSwitches));
   }
 
+  std::string locale =
+      content::GetContentClient()->browser()->GetApplicationLocale();

[brettw, 2012/06/08 22:58:41]

This runs on the I/O thread and you aren't supposed to do this on the I/O
thread.

I've kept as-is since some of the other child processes (including NPAPI)
already do this and from the code it should be fine as long as you don't change
the pref at the same time you set the language.

I'm going to followup with John asynchronously and figure out how we can fix all
of these cases where we need the language on the I/O thread.

+  if (!locale.empty()) {
+    // Pass on the locale so the plugin will know what language we're using.
+    cmd_line->AppendSwitchASCII(switches::kLang, locale);
+  }
+
   if (!plugin_launcher.empty())
     cmd_line->PrependWrapper(plugin_launcher);