Store hosts found in NetworkScanner as lowercase

Stores the hosts found in NetworkScanner as lower case in order to
do URL resolving

Bug: 757625
Change-Id: I791072ecb07d9afb03aa2ba75aacedffcddcd5b0
Reviewed-on: https://chromium-review.googlesource.com/1097707
Commit-Queue: Allen Vicencio <allenvic@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567325}

chrome/browser/chromeos/smb_client/discovery/network_scanner.cc

@@ -84,11 +84,11 @@ void NetworkScanner::AddHostsToResults(uint32_t request_id,
 
   HostMap& existing_hosts = request_iter->second.hosts_found;
   for (const auto& new_host : new_hosts) {
-    const Hostname& new_hostname = new_host.first;
+    const Hostname& new_hostname = base::ToLowerASCII(new_host.first);
     const Address& new_ip = new_host.second;
 
     if (!HostExists(existing_hosts, new_hostname)) {
-      existing_hosts.insert(new_host);
+      existing_hosts.insert(std::pair<Hostname, Address>(new_hostname, new_ip));
     } else if (existing_hosts[new_hostname] != new_ip) {
       LOG(WARNING) << "Different addresses found for host: " << new_hostname;
       LOG(WARNING) << existing_hosts[new_hostname] << ":" << new_ip;

chrome/browser/chromeos/smb_client/discovery/network_scanner_unittest.cc

@@ -176,5 +176,24 @@ TEST_F(NetworkScannerTest, ResolveHostWithUppercaseHost) {
   ExpectResolvedHostEquals("1.2.3.4", "SHARE1");
 }
 
+TEST_F(NetworkScannerTest, HostsAreStoredAsLowercase) {
+  HostMap hosts;
+  hosts["SHARE1"] = "1.2.3.4";
+  hosts["sHaRe2"] = "11.12.13.14";
+  hosts["Share3"] = "21.22.23.24";
+  RegisterHostLocatorWithHosts(hosts);
+
+  // expected_hosts should have all lowercase hosts.
+  HostMap expected_hosts;
+  expected_hosts["share1"] = "1.2.3.4";
+  expected_hosts["share2"] = "11.12.13.14";
+  expected_hosts["share3"] = "21.22.23.24";
+  ExpectHostMapEqual(expected_hosts);
+
+  ExpectResolvedHostEquals("1.2.3.4", "share1");
+  ExpectResolvedHostEquals("11.12.13.14", "share2");
+  ExpectResolvedHostEquals("21.22.23.24", "share3");
+}
+
 }  // namespace smb_client
 }  // namespace chromeos