Mojo: Add the beginnings of a proper embedder API.

mojo/common/test/run_all_perftests.cc

Index: mojo/common/test/run_all_perftests.cc
diff --git a/mojo/common/test/run_all_perftests.cc b/mojo/common/test/run_all_perftests.cc
index 4e1def9b0b58e78a0dba79118937c3a08b12dcae..cf66be68941a5a770b0d506003e3f16ecea41f69 100644
--- a/mojo/common/test/run_all_perftests.cc
+++ b/mojo/common/test/run_all_perftests.cc
@@ -3,10 +3,10 @@
 // found in the LICENSE file.
 
 #include "base/test/perf_test_suite.h"
-#include "mojo/system/core_impl.h"
+#include "mojo/system/embedder.h"
 
 int main(int argc, char** argv) {
-  mojo::system::CoreImpl::Init();
+  mojo::embedder::Init();
   return base::PerfTestSuite(argc, argv).Run();
 }