Add fromIterable(s) constructors in SplayTreeMap and LinkedHashMap.

tests/corelib/linked_hash_map_from_iterable_test.dart

Index: tests/corelib/linked_hash_map_from_iterable_test.dart
diff --git a/tests/corelib/map_from_iterable_test.dart b/tests/corelib/linked_hash_map_from_iterable_test.dart
similarity index 64%
copy from tests/corelib/map_from_iterable_test.dart
copy to tests/corelib/linked_hash_map_from_iterable_test.dart
index 4d0468db66a48f55f4dbe162491cb47d5b90355b..d581532612911d3d1c289fc50704855dcb2adb16 100644
--- a/tests/corelib/map_from_iterable_test.dart
+++ b/tests/corelib/linked_hash_map_from_iterable_test.dart
@@ -16,10 +16,11 @@ main() {
 }
 
 void defaultFunctionValuesTest() {
-  var map = new Map.fromIterable([1, 2, 3]);
+  var map = new LinkedHashMap.fromIterable([1, 2, 3]);
 
   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);
@@ -31,10 +32,11 @@ void defaultFunctionValuesTest() {
 }
 
 void defaultKeyFunctionTest() {
-  var map = new Map.fromIterable([1, 2, 3], value: (x) => x + 1);
+  var map = new LinkedHashMap.fromIterable([1, 2, 3], value: (x) => x + 1);
 
   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);
@@ -46,10 +48,11 @@ void defaultKeyFunctionTest() {
 }
 
 void defaultValueFunctionTest() {
-  var map = new Map.fromIterable([1, 2, 3], key: (x) => x + 1);
+  var map = new LinkedHashMap.fromIterable([1, 2, 3], key: (x) => x + 1);
 
   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);
@@ -61,12 +64,12 @@ void defaultValueFunctionTest() {
 }
 
 void noDefaultValuesTest() {
-  var map = new Map.fromIterable([1, 2, 3],
+  var map = new LinkedHashMap.fromIterable([1, 2, 3],
       key: (x) => x + 1, value: (x) => x - 1);
 
-
   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);
@@ -78,9 +81,10 @@ void noDefaultValuesTest() {
 }
 
 void emptyIterableTest() {
-  var map = new Map.fromIterable([]);
+  var map = new LinkedHashMap.fromIterable([]);
   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);
@@ -88,10 +92,11 @@ void emptyIterableTest() {
 }
 
 void equalElementsTest() {
-  var map = new Map.fromIterable([1, 2, 2], key: (x) => x + 1);
+  var map = new LinkedHashMap.fromIterable([1, 2, 2], key: (x) => x + 1);
 
   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);
@@ -102,11 +107,12 @@ void equalElementsTest() {
 }
 
 void genericTypeTest() {
-  var map = new Map<int, String>.fromIterable([1, 2, 3], value: (x) => '$x');
+  var map = new LinkedHashMap<int, String>.fromIterable([1, 2, 3], value: (x) => '$x');
   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>);
 }