Add ResourcesProvider.loadFromDirectory

This API allows a directory to be loaded as if it was a zipped APK.
This is a substitute for the DirectoryAssetProvider API that
currently does not work in the native layer.

Bug: 142716192
Test: atest FrameworksResourceLoaderTests
Change-Id: Ia13e15653e75b421423dd56f9fe89e183ab4cb9a
diff --git a/libs/androidfw/tests/ApkAssets_test.cpp b/libs/androidfw/tests/ApkAssets_test.cpp
index 26bf5ff..ce9e532 100644
--- a/libs/androidfw/tests/ApkAssets_test.cpp
+++ b/libs/androidfw/tests/ApkAssets_test.cpp
@@ -42,7 +42,7 @@
   const LoadedArsc* loaded_arsc = loaded_apk->GetLoadedArsc();
   ASSERT_THAT(loaded_arsc, NotNull());
   ASSERT_THAT(loaded_arsc->GetPackageById(0x7fu), NotNull());
-  ASSERT_THAT(loaded_apk->Open("res/layout/main.xml"), NotNull());
+  ASSERT_THAT(loaded_apk->GetAssetsProvider()->Open("res/layout/main.xml"), NotNull());
 }
 
 TEST(ApkAssetsTest, LoadApkFromFd) {
@@ -57,7 +57,7 @@
   const LoadedArsc* loaded_arsc = loaded_apk->GetLoadedArsc();
   ASSERT_THAT(loaded_arsc, NotNull());
   ASSERT_THAT(loaded_arsc->GetPackageById(0x7fu), NotNull());
-  ASSERT_THAT(loaded_apk->Open("res/layout/main.xml"), NotNull());
+  ASSERT_THAT(loaded_apk->GetAssetsProvider()->Open("res/layout/main.xml"), NotNull());
 }
 
 TEST(ApkAssetsTest, LoadApkAsSharedLibrary) {
@@ -84,9 +84,11 @@
       ApkAssets::Load(GetTestDataPath() + "/basic/basic.apk");
   ASSERT_THAT(loaded_apk, NotNull());
 
-  { ASSERT_THAT(loaded_apk->Open("res/layout/main.xml", Asset::ACCESS_BUFFER), NotNull()); }
+  { ASSERT_THAT(loaded_apk->GetAssetsProvider()->Open("res/layout/main.xml",
+                                                      Asset::ACCESS_BUFFER), NotNull()); }
 
-  { ASSERT_THAT(loaded_apk->Open("res/layout/main.xml", Asset::ACCESS_BUFFER), NotNull()); }
+  { ASSERT_THAT(loaded_apk->GetAssetsProvider()->Open("res/layout/main.xml",
+                                                      Asset::ACCESS_BUFFER), NotNull()); }
 }
 
 TEST(ApkAssetsTest, OpenUncompressedAssetFd) {
@@ -94,7 +96,8 @@
       ApkAssets::Load(GetTestDataPath() + "/basic/basic.apk");
   ASSERT_THAT(loaded_apk, NotNull());
 
-  auto asset = loaded_apk->Open("assets/uncompressed.txt", Asset::ACCESS_UNKNOWN);
+  auto asset = loaded_apk->GetAssetsProvider()->Open("assets/uncompressed.txt",
+                                                     Asset::ACCESS_UNKNOWN);
   ASSERT_THAT(asset, NotNull());
 
   off64_t start, length;