Add BlimpClientContext and factory with real and dummy implementation

blimp/client/app/android/blimp_app_jni_registrar.h

Index: blimp/client/app/android/blimp_app_jni_registrar.h
diff --git a/blimp/client/app/android/blimp_jni_registrar.h b/blimp/client/app/android/blimp_app_jni_registrar.h
similarity index 66%
copy from blimp/client/app/android/blimp_jni_registrar.h
copy to blimp/client/app/android/blimp_app_jni_registrar.h
index 99000f34d51e23a9b0ce21e8ccef04a63d5baacb..2c83d2d480832a70f0c23f902d8204e660fbbb1f 100644
--- a/blimp/client/app/android/blimp_jni_registrar.h
+++ b/blimp/client/app/android/blimp_app_jni_registrar.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BLIMP_CLIENT_APP_ANDROID_BLIMP_JNI_REGISTRAR_H_
-#define BLIMP_CLIENT_APP_ANDROID_BLIMP_JNI_REGISTRAR_H_
+#ifndef BLIMP_CLIENT_APP_ANDROID_BLIMP_APP_JNI_REGISTRAR_H_
+#define BLIMP_CLIENT_APP_ANDROID_BLIMP_APP_JNI_REGISTRAR_H_
 
 #include <jni.h>
 
@@ -13,9 +13,9 @@ namespace client {
 // Registers native method hooks with the Java runtime specified by |env|.
 // Returns false if registration fails, in which case native methods are
 // unavailable to Java.
-bool RegisterBlimpJni(JNIEnv* env);
+bool RegisterBlimpAppJni(JNIEnv* env);
 
 }  // namespace client
 }  // namespace blimp
 
-#endif  // BLIMP_CLIENT_APP_ANDROID_BLIMP_JNI_REGISTRAR_H_
+#endif  // BLIMP_CLIENT_APP_ANDROID_BLIMP_APP_JNI_REGISTRAR_H_