Passed kUsb and kSd flags

Initially, we were thinking to pass kInternal for non usb drive/sd card
drive (for local external storage like directory shared from ChromeOS).
Fortunately, the DocumentsUI logic apparently has TYPE_LOCAL with
R.drawable.ic_root_smartphone (that is overlayable) for external storage
other than TYPE_USB and TYPE_SD.

Therefore, instead of creating a kInternal flags, we can just passed kUsb
and kSd and not passing anything for "internal external storage" - which
will render ic_root_usb, ic_root_sd, and ic_root_smartphone as icons
accordingly. And since ic_root_smartphone is already overlayable,  we
could overlayed in /vendor - which effectively is what we initially
wanted when thinking of introducing kInternal flag.

Bug: 132796154
Test: Customize flags in /vendor for different devices and DocumentsUI
shows the ic_root_smartphone (which can be overlayed) when kUsb is not
passed, and USB icon when kUsb is passed.
Change-Id: I55f13e214bbb2aeed96b6950bcf391121174c354

VolumeManager.cpp

@@ -899,18 +899,19 @@ int VolumeManager::destroyObb(const std::string& volId) {
 
 int VolumeManager::createStubVolume(const std::string& sourcePath, const std::string& mountPath,
                                     const std::string& fsType, const std::string& fsUuid,
-                                    const std::string& fsLabel, int32_t flags __unused,
+                                    const std::string& fsLabel, int32_t flags,
                                     std::string* outVolId) {
     dev_t stubId = --mNextStubId;
     auto vol = std::shared_ptr<android::vold::StubVolume>(
             new android::vold::StubVolume(stubId, sourcePath, mountPath, fsType, fsUuid, fsLabel));
 
-    // TODO (b/132796154): Passed each supported flags explicitly here.
+    int32_t passedFlags = android::vold::Disk::Flags::kStub;
+    passedFlags |= (flags & android::vold::Disk::Flags::kUsb);
+    passedFlags |= (flags & android::vold::Disk::Flags::kSd);
     // StubDisk doesn't have device node corresponds to it. So, a fake device
-    // number is used. The supported flags will be infered from the
-    // currently-unused flags parameter.
+    // number is used.
     auto disk = std::shared_ptr<android::vold::Disk>(
-            new android::vold::Disk("stub", stubId, "stub", android::vold::Disk::Flags::kStub));
+            new android::vold::Disk("stub", stubId, "stub", passedFlags));
     disk->initializePartition(vol);
     handleDiskAdded(disk);
     *outVolId = vol->getId();