[IncrementalService] getLoadingProgress (v1)

This is to unblock Launcher's work on progress ring. Currently it uses
incfs getFilledBlocks(). Will switch to the new incfs progress reporting
API once it is ready.

Test: unit test
Test: adb shell dumpsys incremental
BUG: 165799231
Change-Id: Icd68124806454f888826294da36f109bca9771ac
diff --git a/services/incremental/BinderIncrementalService.cpp b/services/incremental/BinderIncrementalService.cpp
index 0ae10b6..41945a2 100644
--- a/services/incremental/BinderIncrementalService.cpp
+++ b/services/incremental/BinderIncrementalService.cpp
@@ -237,11 +237,9 @@
     return ok();
 }
 
-binder::Status BinderIncrementalService::isFileRangeLoaded(int32_t storageId,
-                                                           const std::string& path, int64_t start,
-                                                           int64_t end, bool* _aidl_return) {
-    // TODO: implement
-    *_aidl_return = false;
+binder::Status BinderIncrementalService::getLoadingProgress(int32_t storageId,
+                                                            float* _aidl_return) {
+    *_aidl_return = mImpl.getLoadingProgress(storageId);
     return ok();
 }