resources: add build method to SystemAllocator

AddressRanges' name doesn't suggest that it's a SystemAllocator builder.
This CL renames it to SystemAllocatorBuilder, and adds a
SystemAllocator::builder() that removes the need to have a separate
import for the Builder.

A minor change, but it cleans up the interface a bit.

BUG=chromium:936567
TEST=cargo test -p resources && cargo build

Change-Id: I6d14368490c0d3c4018858f541e4ae5390995878
Reviewed-on: https://chromium-review.googlesource.com/1540398
Commit-Ready: Daniel Prilik <prilik@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Zach Reizner <zachr@chromium.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/devices/src/pci/ac97.rs b/devices/src/pci/ac97.rs
index 4bbe090..d883894 100644
--- a/devices/src/pci/ac97.rs
+++ b/devices/src/pci/ac97.rs
@@ -216,14 +216,13 @@ impl PciDevice for Ac97Dev {
 mod tests {
     use super::*;
     use audio_streams::DummyStreamSource;
-    use resources::AddressRanges;
     use sys_util::GuestAddress;
 
     #[test]
     fn create() {
         let mem = GuestMemory::new(&[(GuestAddress(0u64), 4 * 1024 * 1024)]).unwrap();
         let mut ac97_dev = Ac97Dev::new(mem, Box::new(DummyStreamSource::new()));
-        let mut allocator = AddressRanges::new()
+        let mut allocator = SystemAllocator::builder()
             .add_io_addresses(0x1000_0000, 0x1000_0000)
             .add_mmio_addresses(0x2000_0000, 0x1000_0000)
             .add_device_addresses(0x3000_0000, 0x1000_0000)