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

ui/base/material_design/material_design_controller.cc

Index: ui/base/material_design/material_design_controller.cc
diff --git a/ui/base/material_design/material_design_controller.cc b/ui/base/material_design/material_design_controller.cc
index f4e633612d67d606368caf25f24105ff025f85ee..5f7d777350e188c1f60f584fa0a36fb2ad5f379f 100644
--- a/ui/base/material_design/material_design_controller.cc
+++ b/ui/base/material_design/material_design_controller.cc
@@ -27,6 +27,8 @@ namespace ui {
 
 bool MaterialDesignController::is_mode_initialized_ = false;
 
+bool MaterialDesignController::mode_initialized_by_switch_ = false;
+
 MaterialDesignController::Mode MaterialDesignController::mode_ =
     MaterialDesignController::Mode::NON_MATERIAL;
 
@@ -41,6 +43,8 @@ void MaterialDesignController::Initialize() {
       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kTopChromeMD);
 
+  mode_initialized_by_switch_ = true;
+
   if (switch_value == switches::kTopChromeMDMaterial) {
     SetMode(Mode::MATERIAL_NORMAL);
   } else if (switch_value == switches::kTopChromeMDMaterialHybrid) {
@@ -53,12 +57,30 @@ void MaterialDesignController::Initialize() {
                  << "' for command line switch '" << switches::kTopChromeMD
                  << "'.";
     }
+    mode_initialized_by_switch_ = false;
     SetMode(DefaultMode());
   }
 #endif  // !defined(ENABLE_TOPCHROME_MD)
 }
 
 // static
+bool MaterialDesignController::DeviceListsComplete() {
+#if defined(OS_CHROMEOS)
+  DCHECK(DeviceDataManager::HasInstance());
+  DCHECK(DeviceDataManager::GetInstance()->device_lists_complete());
+
+  if (!is_mode_initialized_ || mode_initialized_by_switch_)
+    return false;
+
+  if (GetTouchScreensAvailability() == TouchScreensAvailability::ENABLED &&
+      GetMode() == Mode::MATERIAL_NORMAL) {
+    mode_ = Mode::MATERIAL_HYBRID;
+    return true;
+  }
+#endif  // defined(OS_CHROMEOS)
+  return false;
+}
+
 MaterialDesignController::Mode MaterialDesignController::GetMode() {
   CHECK(is_mode_initialized_);
   return mode_;
@@ -78,24 +100,6 @@ MaterialDesignController::Mode MaterialDesignController::DefaultMode() {
     return GetTouchScreensAvailability() == TouchScreensAvailability::ENABLED ?
         Mode::MATERIAL_HYBRID : Mode::MATERIAL_NORMAL;
   }
-
-#if defined(USE_OZONE)
-  base::FileEnumerator file_enum(
-      base::FilePath(FILE_PATH_LITERAL("/dev/input")), false,
-      base::FileEnumerator::FILES, FILE_PATH_LITERAL("event*[0-9]"));
-  for (base::FilePath path = file_enum.Next(); !path.empty();
-       path = file_enum.Next()) {
-    EventDeviceInfo devinfo;
-    int fd = open(path.value().c_str(), O_RDWR | O_NONBLOCK | O_CLOEXEC);
-    if (fd >= 0) {
-      if (devinfo.Initialize(fd, path) && devinfo.HasTouchscreen()) {
-        close(fd);
-        return Mode::MATERIAL_HYBRID;
-      }
-      close(fd);
-    }
-  }
-#endif  // defined(USE_OZONE)
   return Mode::MATERIAL_NORMAL;
 #elif defined(OS_LINUX)
   return Mode::MATERIAL_NORMAL;