Introduce heap snapshot into Memory Dashboard

runtime/observatory/lib/src/elements/memory/allocations.dart

Index: runtime/observatory/lib/src/elements/memory/allocations.dart
diff --git a/runtime/observatory/lib/src/elements/memory/profile.dart b/runtime/observatory/lib/src/elements/memory/allocations.dart
similarity index 92%
copy from runtime/observatory/lib/src/elements/memory/profile.dart
copy to runtime/observatory/lib/src/elements/memory/allocations.dart
index 2d0e0093f224b73b8b3a9000f03d00fc00ac44b2..b02a81a50d8e97ad9a53e26ff0b3b022055aab09 100644
--- a/runtime/observatory/lib/src/elements/memory/profile.dart
+++ b/runtime/observatory/lib/src/elements/memory/allocations.dart
@@ -32,13 +32,14 @@ enum _SortingField {
 
 enum _SortingDirection { ascending, descending }
 
-class MemoryProfileElement extends HtmlElement implements Renderable {
-  static const tag = const Tag<MemoryProfileElement>('memory-profile',
+class MemoryAllocationsElement extends HtmlElement implements Renderable {
+  static const tag = const Tag<MemoryAllocationsElement>('memory-allocations',
       dependencies: const [ClassRefElement.tag, VirtualCollectionElement.tag]);
 
-  RenderingScheduler<MemoryProfileElement> _r;
+  RenderingScheduler<MemoryAllocationsElement> _r;
 
-  Stream<RenderedEvent<MemoryProfileElement>> get onRendered => _r.onRendered;
+  Stream<RenderedEvent<MemoryAllocationsElement>> get onRendered =>
+      _r.onRendered;
 
   M.IsolateRef _isolate;
   M.EventRepository _events;
@@ -51,14 +52,17 @@ class MemoryProfileElement extends HtmlElement implements Renderable {
 
   M.IsolateRef get isolate => _isolate;
 
-  factory MemoryProfileElement(M.IsolateRef isolate, M.EditorRepository editor,
-      M.EventRepository events, M.AllocationProfileRepository repository,
+  factory MemoryAllocationsElement(
+      M.IsolateRef isolate,
+      M.EditorRepository editor,
+      M.EventRepository events,
+      M.AllocationProfileRepository repository,
       {RenderingQueue queue}) {
     assert(isolate != null);
     assert(events != null);
     assert(editor != null);
     assert(repository != null);
-    MemoryProfileElement e = document.createElement(tag.name);
+    MemoryAllocationsElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._isolate = isolate;
     e._editor = editor;
@@ -67,7 +71,7 @@ class MemoryProfileElement extends HtmlElement implements Renderable {
     return e;
   }
 
-  MemoryProfileElement.created() : super.created();
+  MemoryAllocationsElement.created() : super.created();
 
   @override
   attached() {
@@ -232,7 +236,7 @@ class MemoryProfileElement extends HtmlElement implements Renderable {
     e.children[4] = new ClassRefElement(_isolate, item.clazz, queue: _r.queue)
       ..classes = ['name'];
     Element.clickEvent.forTarget(e.children[4], useCapture: true).listen((e) {
-      if (_editor.canOpenClass) {
+      if (_editor.isAvailable) {
         e.preventDefault();
         _editor.openClass(isolate, item.clazz);
       }