Support $0, $1, ... $6, inspect, and other console api methods.

LayoutTests/dart/inspector/debugger-eval-on-call-frame.html

Index: LayoutTests/dart/inspector/debugger-eval-on-call-frame.html
diff --git a/LayoutTests/dart/inspector/debugger-eval-on-call-frame.html b/LayoutTests/dart/inspector/debugger-eval-on-call-frame.html
index 72564a9aaf44e2fd1f0f70c107693f0b6364ab3b..7c4cd43121c5905b281cf4d981d493ee17383d95 100644
--- a/LayoutTests/dart/inspector/debugger-eval-on-call-frame.html
+++ b/LayoutTests/dart/inspector/debugger-eval-on-call-frame.html
@@ -65,6 +65,17 @@ function test()
                     // executing closure.
                     'foo',
                     'z',
+                    // Command line API
+                    'inspect(document.documentElement)',
+                    'inspect(document.body)',
+                    'inspect(document.body.children.first)',
+                    '$0.toString()',
+                    '$1.toString()',
+                    '$2.toString()',
+                    '$1 == document.body',
+                    '$1 == document.body',
+                    '$2 == document.documentElement',
+                    'dir([1,2,3,4,5])',
                 ];
                 evaluate(expressions.shift());
             }