Add pause/resume for isolates in vmservice/observatory.

runtime/bin/vmservice/client/lib/src/elements/isolate_view.dart

Index: runtime/bin/vmservice/client/lib/src/elements/isolate_view.dart
diff --git a/runtime/bin/vmservice/client/lib/src/elements/isolate_view.dart b/runtime/bin/vmservice/client/lib/src/elements/isolate_view.dart
index 2c6b121091e26a11796352fae4a00dd835954c0e..582c9eef83c37135ee1941f57813b471cf670327 100644
--- a/runtime/bin/vmservice/client/lib/src/elements/isolate_view.dart
+++ b/runtime/bin/vmservice/client/lib/src/elements/isolate_view.dart
@@ -121,12 +121,21 @@ class IsolateViewElement extends ObservatoryElement {
     isolate.reload().whenComplete(done);
   }
 
-  void resume(var a, var b, var c) {
-    isolate.get("resume").then((result) {
-      // TODO(turnidge): Instead of asserting here, handling errors
-      // properly.
-      assert(result.serviceType == 'Success');
-      isolate.reload();
-    });
+  Future pause(_) {
+    return isolate.get("debug/pause").then((result) {
+        // TODO(turnidge): Instead of asserting here, handle errors
+        // properly.
+        assert(result.serviceType == 'Success');
+        return isolate.reload();
+      });
+  }
+
+  Future resume(_) {
+    return isolate.get("resume").then((result) {
+        // TODO(turnidge): Instead of asserting here, handle errors
+        // properly.
+        assert(result.serviceType == 'Success');
+        return isolate.reload();
+      });
   }
 }