chromeos: Show onscreen bubble when brightness changes.

chrome/browser/chromeos/cros/cros_library.cc

Index: chrome/browser/chromeos/cros/cros_library.cc
diff --git a/chrome/browser/chromeos/cros/cros_library.cc b/chrome/browser/chromeos/cros/cros_library.cc
index 9065304b11441b49ba44f310ae789cc4ed1be899..a294329de98666ca6e59784609f831b2d9313a69 100644
--- a/chrome/browser/chromeos/cros/cros_library.cc
+++ b/chrome/browser/chromeos/cros/cros_library.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/chromeos/cros/cros_library.h"
 
+#include "chrome/browser/chromeos/cros/brightness_library.h"
 #include "chrome/browser/chromeos/cros/burn_library.h"
 #include "chrome/browser/chromeos/cros/cros_library_loader.h"
 #include "chrome/browser/chromeos/cros/cryptohome_library.h"
@@ -40,6 +41,10 @@ CrosLibrary* CrosLibrary::Get() {
   return Singleton<CrosLibrary>::get();
 }
 
+BrightnessLibrary* CrosLibrary::GetBrightnessLibrary() {
+  return brightness_lib_.GetDefaultImpl(use_stub_impl_);
+}
+
 BurnLibrary* CrosLibrary::GetBurnLibrary() {
   return burn_lib_.GetDefaultImpl(use_stub_impl_);
 }
@@ -138,6 +143,11 @@ void CrosLibrary::TestApi::SetLibraryLoader(LibraryLoader* loader, bool own) {
   library_->load_error_ = false;
 }
 
+void CrosLibrary::TestApi::SetBrightnessLibrary(
+    BrightnessLibrary* library, bool own) {
+  library_->brightness_lib_.SetImpl(library, own);
+}
+
 void CrosLibrary::TestApi::SetBurnLibrary(
     BurnLibrary* library, bool own) {
   library_->burn_lib_.SetImpl(library, own);