Split AndroidRuntime into AndroidRuntimeBase base-class and the rest.

AndroidRuntimeBase (exported by libandroid_runtime_base.so) is all you need
to link against to gain the ability to do AndroidRuntimeBase::getJNIEnv()
thus minimizing build dependencies.

Change-Id: Ia7f0c94c8c02b974c068e0db34774827f96aa95b
diff --git a/include/android_runtime/AndroidRuntimeBase.h b/include/android_runtime/AndroidRuntimeBase.h
new file mode 100644
index 0000000..2b14987
--- /dev/null
+++ b/include/android_runtime/AndroidRuntimeBase.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _RUNTIME_ANDROID_RUNTIME_BASE_H
+#define _RUNTIME_ANDROID_RUNTIME_BASE_H
+
+#include <nativehelper/jni.h>
+
+namespace android {
+
+struct AndroidRuntimeBase {
+    /** return a pointer to the VM running in this process */
+    static JavaVM* getJavaVM() { return mJavaVM; }
+
+    /** return a pointer to the JNIEnv pointer for this thread */
+    static JNIEnv* getJNIEnv();
+
+    /**
+     * Register a set of methods in the specified class.
+     */
+    static int registerNativeMethods(JNIEnv* env,
+        const char* className, const JNINativeMethod* gMethods, int numMethods);
+
+protected:
+    /* JNI JavaVM pointer */
+    static JavaVM* mJavaVM;
+
+    AndroidRuntimeBase() {}
+    virtual ~AndroidRuntimeBase() {}
+
+    AndroidRuntimeBase(const AndroidRuntimeBase &);
+    AndroidRuntimeBase &operator=(const AndroidRuntimeBase &);
+};
+
+}  // namespace android
+
+#endif // _RUNTIME_ANDROID_RUNTIME_BASE_H