diff --git a/brightray/brightray.gypi b/brightray/brightray.gypi
index f9ea898085..4513fa95db 100644
--- a/brightray/brightray.gypi
+++ b/brightray/brightray.gypi
@@ -131,6 +131,8 @@
           'SK_SUPPORT_LEGACY_SETCONFIG',
           'SK_IGNORE_ETC1_SUPPORT',
           'SK_IGNORE_GPU_DITHER',
+          # NACL is not enabled:
+          'DISABLE_NACL',
         ],
         'conditions': [
           ['OS!="mac"', {
diff --git a/brightray/browser/browser_main_parts.cc b/brightray/browser/browser_main_parts.cc
index b0a7e72b5f..279eff9b81 100644
--- a/brightray/browser/browser_main_parts.cc
+++ b/brightray/browser/browser_main_parts.cc
@@ -7,6 +7,7 @@
 #include "browser/browser_context.h"
 #include "browser/devtools_manager_delegate.h"
 #include "browser/web_ui_controller_factory.h"
+#include "common/main_delegate.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ -14,6 +15,7 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_switches.h"
 #include "net/proxy/proxy_resolver_v8.h"
+#include "ui/base/l10n/l10n_util.h"
 
 #if defined(USE_AURA)
 #include "ui/gfx/screen.h"
@@ -39,7 +41,6 @@
 
 #if defined(OS_WIN)
 #include "ui/base/cursor/cursor_loader_win.h"
-#include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_win.h"
 #include "ui/gfx/platform_font_win.h"
 #endif
@@ -169,6 +170,10 @@ void BrowserMainParts::ToolkitInitialized() {
 }
 
 void BrowserMainParts::PreMainMessageLoopStart() {
+#if defined(OS_MACOSX)
+  l10n_util::OverrideLocaleWithCocoaLocale();
+#endif
+  InitializeResourceBundle("");
 #if defined(OS_MACOSX)
   InitializeMainNib();
 #endif
diff --git a/brightray/common/main_delegate.cc b/brightray/common/main_delegate.cc
index 000e3a530e..74ec88791b 100644
--- a/brightray/common/main_delegate.cc
+++ b/brightray/common/main_delegate.cc
@@ -10,11 +10,70 @@
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "content/public/common/content_switches.h"
-#include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
+#include "ui/base/ui_base_switches.h"
 
 namespace brightray {
 
+namespace {
+
+// Returns true if this subprocess type needs the ResourceBundle initialized
+// and resources loaded.
+bool SubprocessNeedsResourceBundle(const std::string& process_type) {
+  return
+#if defined(OS_WIN) || defined(OS_MACOSX)
+      // Windows needs resources for the default/null plugin.
+      // Mac needs them for the plugin process name.
+      process_type == switches::kPluginProcess ||
+#endif
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+      // The zygote process opens the resources for the renderers.
+      process_type == switches::kZygoteProcess ||
+#endif
+#if defined(OS_MACOSX)
+      // Mac needs them too for scrollbar related images and for sandbox
+      // profiles.
+#if !defined(DISABLE_NACL)
+      process_type == switches::kNaClLoaderProcess ||
+#endif
+      process_type == switches::kPpapiPluginProcess ||
+      process_type == switches::kPpapiBrokerProcess ||
+      process_type == switches::kGpuProcess ||
+#endif
+      process_type == switches::kRendererProcess ||
+      process_type == switches::kUtilityProcess;
+}
+
+}  // namespace
+
+void InitializeResourceBundle(const std::string& locale) {
+  // Load locales.
+  ui::ResourceBundle::InitSharedInstanceWithLocale(
+      locale, nullptr, ui::ResourceBundle::DO_NOT_LOAD_COMMON_RESOURCES);
+
+  // Load other resource files.
+  base::FilePath path;
+#if defined(OS_MACOSX)
+  path = GetResourcesPakFilePath();
+#else
+  base::FilePath pak_dir;
+  PathService::Get(base::DIR_MODULE, &pak_dir);
+  path = pak_dir.Append(FILE_PATH_LITERAL("content_shell.pak"));
+#endif
+
+  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
+  bundle.AddDataPackFromPath(path, ui::GetSupportedScaleFactors()[0]);
+#if defined(OS_WIN)
+  bundle.AddDataPackFromPath(
+      pak_dir.Append(FILE_PATH_LITERAL("ui_resources_200_percent.pak")),
+      ui::SCALE_FACTOR_200P);
+  bundle.AddDataPackFromPath(
+      pak_dir.Append(FILE_PATH_LITERAL("content_resources_200_percent.pak")),
+      ui::SCALE_FACTOR_200P);
+#endif
+}
+
+
 MainDelegate::MainDelegate() {
 }
 
@@ -36,27 +95,16 @@ bool MainDelegate::BasicStartupComplete(int* exit_code) {
 }
 
 void MainDelegate::PreSandboxStartup() {
-#if defined(OS_MACOSX)
-  l10n_util::OverrideLocaleWithCocoaLocale();
-#endif
-  InitializeResourceBundle();
-}
+  auto cmd = *base::CommandLine::ForCurrentProcess();
+  std::string process_type = cmd.GetSwitchValueASCII(switches::kProcessType);
 
-void MainDelegate::InitializeResourceBundle() {
-  base::FilePath path;
-#if defined(OS_MACOSX)
-  path = GetResourcesPakFilePath();
-#else
-  base::FilePath pak_dir;
-  PathService::Get(base::DIR_MODULE, &pak_dir);
-  path = pak_dir.Append(FILE_PATH_LITERAL("content_shell.pak"));
-#endif
-
-  ui::ResourceBundle::InitSharedInstanceWithLocale("", nullptr,
-      ui::ResourceBundle::DO_NOT_LOAD_COMMON_RESOURCES);
-  ui::ResourceBundle::GetSharedInstance().AddDataPackFromPath(
-      path, ui::GetSupportedScaleFactors()[0]);
-  AddDataPackFromPath(&ui::ResourceBundle::GetSharedInstance(), path.DirName());
+  // Initialize ResourceBundle which handles files loaded from external
+  // sources. The language should have been passed in to us from the
+  // browser process as a command line flag.
+  if (SubprocessNeedsResourceBundle(process_type)) {
+    std::string locale = cmd.GetSwitchValueASCII(switches::kLang);
+    InitializeResourceBundle(locale);
+  }
 }
 
 content::ContentBrowserClient* MainDelegate::CreateContentBrowserClient() {
diff --git a/brightray/common/main_delegate.h b/brightray/common/main_delegate.h
index 5834994474..2082a52288 100644
--- a/brightray/common/main_delegate.h
+++ b/brightray/common/main_delegate.h
@@ -22,6 +22,9 @@ namespace brightray {
 class BrowserClient;
 class ContentClient;
 
+void InitializeResourceBundle(const std::string& locale);
+base::FilePath GetResourcesPakFilePath();
+
 class MainDelegate : public content::ContentMainDelegate {
  public:
   MainDelegate();
@@ -36,15 +39,9 @@ class MainDelegate : public content::ContentMainDelegate {
   // implementation.
   virtual scoped_ptr<BrowserClient> CreateBrowserClient();
 
-  // Subclasses can override this to provide additional .pak files to be
-  // included in the ui::ResourceBundle.
-  virtual void AddDataPackFromPath(
-      ui::ResourceBundle* bundle, const base::FilePath& pak_dir) {}
-
 #if defined(OS_MACOSX)
   // Subclasses can override this to custom the paths of child process and
   // framework bundle.
-  virtual base::FilePath GetResourcesPakFilePath();
   virtual void OverrideChildProcessPath();
   virtual void OverrideFrameworkBundlePath();
 #endif
@@ -55,8 +52,6 @@ class MainDelegate : public content::ContentMainDelegate {
  private:
   content::ContentBrowserClient* CreateContentBrowserClient() override;
 
-  void InitializeResourceBundle();
-
   scoped_ptr<ContentClient> content_client_;
   scoped_ptr<BrowserClient> browser_client_;
 
diff --git a/brightray/common/main_delegate_mac.mm b/brightray/common/main_delegate_mac.mm
index 42f6e818e1..464cf68b50 100644
--- a/brightray/common/main_delegate_mac.mm
+++ b/brightray/common/main_delegate_mac.mm
@@ -27,7 +27,7 @@ base::FilePath GetFrameworksPath() {
 
 }
 
-base::FilePath MainDelegate::GetResourcesPakFilePath() {
+base::FilePath GetResourcesPakFilePath() {
   auto path = [base::mac::FrameworkBundle() pathForResource:@"content_shell" ofType:@"pak"];
   return base::mac::NSStringToFilePath(path);
 }