Splits ash_test_resources_100_percent into two pak files

ash/test/ash_test_environment.h

Index: ash/test/ash_test_environment.h
diff --git a/ash/test/ash_test_environment.h b/ash/test/ash_test_environment.h
index a763936066dc2f60d89538fcafb8addad5cfa057..e66f4d649e9b5855c047bd73f5ae3b99adbf791b 100644
--- a/ash/test/ash_test_environment.h
+++ b/ash/test/ash_test_environment.h
@@ -34,6 +34,9 @@ class AshTestEnvironment {
   // Creates the object appropriate to the current environment.
   static std::unique_ptr<AshTestEnvironment> Create();
 
+  // Adds environment specific resources to ResourceBundle.

[msw, 2016/09/06 22:57:38]

Should this instead just provide a string or file path for
AuraShellTestSuite::Initialize, which can then do all the loading?

[sky, 2016/09/06 23:25:00]

I agree. I got lazy. Done.

+  static void AddDataPacks();

[msw, 2016/09/06 22:57:38]

nit: maybe AddDataPacksToResourceBundle or similar?

+
   // Called from AshTestHelper::SetUp()/TearDown().
   virtual void SetUp() {}
   virtual void TearDown() {}