Add support for the version pragma.

Change-Id: I62707dcb432093ba50db95e527d55ff781be22a9
diff --git a/slang_rs_context.h b/slang_rs_context.h
index c59545a..7b1884b 100644
--- a/slang_rs_context.h
+++ b/slang_rs_context.h
@@ -73,6 +73,8 @@
   std::string mReflectJavaPackageName;
   std::string mReflectJavaPathName;
 
+  int version;
+
   bool processExportVar(const clang::VarDecl *VD);
   bool processExportFunc(const clang::FunctionDecl *FD);
   bool processExportType(const llvm::StringRef &Name);
@@ -175,6 +177,12 @@
                      const std::string &OutputBCFileName,
                      std::string *RealPackageName);
 
+  int getVersion() const { return version; }
+  void setVersion(int v) {
+    version = v;
+    return;
+  }
+
   ~RSContext();
 };