[WIP] Fire a theme changed notification when device scan completes

chrome/browser/themes/theme_service.cc

Index: chrome/browser/themes/theme_service.cc
diff --git a/chrome/browser/themes/theme_service.cc b/chrome/browser/themes/theme_service.cc
index 11e8f1767a9b9aa2ed06f5019d260690fb9e900e..f696bf418b2b2412c1d5e82e99dad6b2237999b3 100644
--- a/chrome/browser/themes/theme_service.cc
+++ b/chrome/browser/themes/theme_service.cc
@@ -41,6 +41,7 @@
 #include "ui/base/layout.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/resource/resource_bundle.h"
+#include "ui/events/devices/device_data_manager.h"
 #include "ui/gfx/color_palette.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/native_theme/common_theme.h"
@@ -213,6 +214,8 @@ ThemeService::ThemeService()
       weak_ptr_factory_(this) {}
 
 ThemeService::~ThemeService() {
+  if (ui::DeviceDataManager::HasInstance())
+    ui::DeviceDataManager::GetInstance()->RemoveObserver(this);
   FreePlatformCaches();
 }
 
@@ -220,6 +223,9 @@ void ThemeService::Init(Profile* profile) {
   DCHECK(CalledOnValidThread());
   profile_ = profile;
 
+  if (ui::DeviceDataManager::HasInstance())
+    ui::DeviceDataManager::GetInstance()->AddObserver(this);  // move to ctor?
+
   LoadThemePrefs();
 
   registrar_.Add(this,
@@ -257,6 +263,11 @@ void ThemeService::Observe(int type,
   }
 }
 
+void ThemeService::OnDeviceListsComplete() {
+  if (ui::MaterialDesignController::DeviceListsComplete())
+    NotifyThemeChanged();
+}
+
 void ThemeService::SetTheme(const Extension* extension) {
   DCHECK(extension->is_theme());
   ExtensionService* service =