Implement function entry breakpoints in Observatory debugger.

runtime/observatory/lib/src/service/object.dart

Index: runtime/observatory/lib/src/service/object.dart
diff --git a/runtime/observatory/lib/src/service/object.dart b/runtime/observatory/lib/src/service/object.dart
index fb46c10304d9e2289c62703137111807d430c6a5..ac336add2f81344431d87f32153331a0cefc30e9 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -1091,7 +1091,7 @@ class Isolate extends ServiceObjectOwner with Coverage {
   Future<ServiceObject> addBreakpoint(Script script, int line) {
     // TODO(turnidge): Pass line as an int instead of a string.
     return invokeRpc('addBreakpoint',
-                     { 'script': script.id, 'line': '$line' }).then((result) {
+                     { 'scriptId': script.id, 'line': '$line' }).then((result) {
         if (result is ServiceMap &&
             result.type == 'Breakpoint' &&
             result['resolved'] &&
@@ -1108,6 +1108,17 @@ class Isolate extends ServiceObjectOwner with Coverage {
       });
   }
 
+  Future<ServiceObject> addBreakpointAtEntry(ServiceFunction function) {
+    return invokeRpc('addBreakpointAtEntry',
+                     { 'functionId': function.id }).then((result) {
+        // TODO(turnidge): Instead of reloading all of the breakpoints,
+        // rely on events to update the breakpoint list.
+        return reloadBreakpoints().then((_) {
+            return result;
+        });
+      });
+  }
+
   Future removeBreakpoint(ServiceMap bpt) {
     return invokeRpc('removeBreakpoint',
                      { 'breakpointId': bpt.id }).then((result) {