Add fromIterable(s) constructors in SplayTreeMap and LinkedHashMap.

sdk/lib/core/map.dart

Index: sdk/lib/core/map.dart
diff --git a/sdk/lib/core/map.dart b/sdk/lib/core/map.dart
index 67bc8927abba7c5dde144b1b6eb36da3654d0e3d..e74b93627f8bcd80d45d4101d02e2366fb67a6a1 100644
--- a/sdk/lib/core/map.dart
+++ b/sdk/lib/core/map.dart
@@ -20,20 +20,6 @@ abstract class Map<K, V> {
   factory Map.from(Map<K, V> other) => new HashMap<K, V>.from(other);
 
   /**
-   * Creates a [Map] associating the given [keys] to [values].
-   *
-   * This constructor iterates over [keys] and [values] and maps each element of
-   * [keys] to the corresponding element of [values].
-   *
-   * If [keys] contains the same object multiple times, the last occurrence
-   * overwrites the previous value.
-   *
-   * It is an error if the two [Iterable]s don't have the same length.
-   */
-  factory Map.fromIterables(Iterable<K> keys, Iterable<V> values)
-      = HashMap<K, V>.fromIterables;
-
-  /**
    * Creates a [Map] where the keys and values are computed from the [iterable].
    *
    * For each element of the [iterable] this constructor computes a key/value
@@ -45,10 +31,24 @@ abstract class Map<K, V> {
    * If no values are specified for [key] and [value] the default is the
    * identity function.
    */
-  factory Map.fromIterable(Iterable iterable,
+  factory Map.fromIterable(Iterable<K> iterable,
       {K key(element), V value(element)}) = HashMap<K, V>.fromIterable;
 
   /**
+   * Creates a [Map] associating the given [keys] to [values].
+   *
+   * This constructor iterates over [keys] and [values] and maps each element of
+   * [keys] to the corresponding element of [values].
+   *
+   * If [keys] contains the same object multiple times, the last occurrence
+   * overwrites the previous value.
+   *
+   * It is an error if the two [Iterable]s don't have the same length.
+   */
+  factory Map.fromIterables(Iterable<K> keys, Iterable<V> values)
+      = HashMap<K, V>.fromIterables;
+
+  /**
    * Returns whether this map contains the given [value].
    */
   bool containsValue(Object value);