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..c533120f7b3a64bb74c2df07455e75dfef2692ab 100644
--- a/ash/test/ash_test_environment.h
+++ b/ash/test/ash_test_environment.h
@@ -6,6 +6,7 @@
 #define ASH_TEST_ASH_TEST_ENVIRONMENT_H_
 
 #include <memory>
+#include <string>
 
 namespace base {
 class SequencedWorkerPool;
@@ -34,6 +35,9 @@ class AshTestEnvironment {
   // Creates the object appropriate to the current environment.
   static std::unique_ptr<AshTestEnvironment> Create();
 
+  // Returns the ASCII file name of where the 100% resources are stored.
+  static std::string Get100PercentResourceFileName();
+
   // Called from AshTestHelper::SetUp()/TearDown().
   virtual void SetUp() {}
   virtual void TearDown() {}