Add fromIterable(s) constructors in SplayTreeMap and LinkedHashMap.

tests/corelib/linked_hash_map_from_iterables_test.dart

Index: tests/corelib/linked_hash_map_from_iterables_test.dart
diff --git a/tests/corelib/map_from_iterables_test.dart b/tests/corelib/linked_hash_map_from_iterables_test.dart
similarity index 63%
copy from tests/corelib/map_from_iterables_test.dart
copy to tests/corelib/linked_hash_map_from_iterables_test.dart
index 8c21e9f6b2ced4971c45672988ace394a07aa040..0212dd4b4ef7f7041d5f00a44928eb961472f528 100644
--- a/tests/corelib/map_from_iterables_test.dart
+++ b/tests/corelib/linked_hash_map_from_iterables_test.dart
@@ -15,9 +15,10 @@ main() {
 }
 
 void positiveTest() {
-  var map = new Map.fromIterables([1, 2, 3], ["one", "two", "three"]);
+  var map = new LinkedHashMap.fromIterables([1, 2, 3], ["one", "two", "three"]);
   Expect.isTrue(map is Map);
-  Expect.isTrue(map is HashMap);
+  Expect.isTrue(map is LinkedHashMap);
+  Expect.isFalse(map is HashMap);
 
   Expect.equals(3, map.length);
   Expect.equals(3, map.keys.length);
@@ -29,9 +30,10 @@ void positiveTest() {
 }
 
 void emptyMapTest() {
-  var map = new Map.fromIterables([], []);
+  var map = new LinkedHashMap.fromIterables([], []);
   Expect.isTrue(map is Map);
-  Expect.isTrue(map is HashMap);
+  Expect.isTrue(map is LinkedHashMap);
+  Expect.isFalse(map is HashMap);
 
   Expect.equals(0, map.length);
   Expect.equals(0, map.keys.length);
@@ -39,17 +41,18 @@ void emptyMapTest() {
 }
 
 void fewerValuesIterableTest() {
-  Expect.throws(() => new Map.fromIterables([1,2], [0]));
+  Expect.throws(() => new LinkedHashMap.fromIterables([1,2], [0]));
 }
 
 void fewerKeysIterableTest() {
-  Expect.throws(() => new Map.fromIterables([1], [0,2]));
+  Expect.throws(() => new LinkedHashMap.fromIterables([1], [0,2]));
 }
 
 void equalElementsTest() {
-  var map = new Map.fromIterables([1, 2, 2], ["one", "two", "three"]);
+  var map = new LinkedHashMap.fromIterables([1, 2, 2], ["one", "two", "three"]);
   Expect.isTrue(map is Map);
-  Expect.isTrue(map is HashMap);
+  Expect.isTrue(map is LinkedHashMap);
+  Expect.isFalse(map is HashMap);
 
   Expect.equals(2, map.length);
   Expect.equals(2, map.keys.length);
@@ -61,13 +64,14 @@ void equalElementsTest() {
 
 
 void genericTypeTest() {
-  var map = new Map<int, String>.fromIterables(
+  var map = new LinkedHashMap<int, String>.fromIterables(
       [1, 2, 3], ["one", "two", "three"]);
   Expect.isTrue(map is Map<int, String>);
+  Expect.isTrue(map is LinkedHashMap<int, String>);
 
-  // Make sure it is not just Map<dynamic, dynamic>.
-  Expect.isFalse(map is Map<String, dynamic>);
-  Expect.isFalse(map is Map<dynamic, int>);
+  // Make sure it is not just LinkedHashMap<dynamic, dynamic>.
+  Expect.isFalse(map is LinkedHashMap<String, dynamic>);
+  Expect.isFalse(map is LinkedHashMap<dynamic, int>);
 
   Expect.equals(3, map.length);
   Expect.equals(3, map.keys.length);