Use C++ JNI Implementation for Crashlytics Unity Methods

PiperOrigin-RevId: 242179210

Author: Googler

app/src/include/firebase/app.h

@@ -40,6 +40,11 @@ class FunctionRegistry;
 namespace auth {
 class Auth;
 }  // namespace auth
+namespace crashlytics {
+namespace internal {
+class CrashlyticsInternal;
+}  // namespace internal
+}  // namespace crashlytics
 namespace database {
 namespace internal {
 class DatabaseInternal;
@@ -622,6 +627,7 @@ class App {
  private:
   /// @cond FIREBASE_APP_INTERNAL
   friend class auth::Auth;
+  friend class crashlytics::internal::CrashlyticsInternal;
   friend class database::internal::DatabaseInternal;
 #ifdef INTERNAL_EXPERIMENTAL
   friend class firestore::FirestoreInternal;

app/src/util_android.h

@@ -506,6 +506,8 @@ bool LookupFieldIds(JNIEnv* env, jclass clazz,
 // Used to call android.app.Activity methods.
 // clang-format off
 #define ACTIVITY_BASE_METHODS(X)                                        \
+  X(GetApplicationContext, "getApplicationContext",                     \
+  "()Landroid/content/Context;"),                                       \
   X(GetCacheDir, "getCacheDir", "()Ljava/io/File;"),                    \
   X(GetClassLoader, "getClassLoader", "()Ljava/lang/ClassLoader;"),     \
   X(GetIntent, "getIntent", "()Landroid/content/Intent;"),              \