Splits ash_test_resources_100_percent into two pak files

ash/test/ash_test_environment_content.cc

Index: ash/test/ash_test_environment_content.cc
diff --git a/ash/test/ash_test_environment_content.cc b/ash/test/ash_test_environment_content.cc
index 0e5123730ab39b6f5872b57c62ce53e0675b75ed..e0d228ca1ff35d086998b5f79ed7fd2eeee58b46 100644
--- a/ash/test/ash_test_environment_content.cc
+++ b/ash/test/ash_test_environment_content.cc
@@ -39,6 +39,11 @@ std::unique_ptr<AshTestEnvironment> AshTestEnvironment::Create() {
   return base::MakeUnique<AshTestEnvironmentContent>();
 }
 
+// static
+std::string AshTestEnvironment::Get100PercentResourceFileName() {
+  return "ash_test_resources_with_content_100_percent.pak";
+}
+
 AshTestEnvironmentContent::AshTestEnvironmentContent()
     : thread_bundle_(base::MakeUnique<content::TestBrowserThreadBundle>()) {}