Support stepin for combination of apply and bound function

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index 7624f26d7ad9490b58fceef330095b8b15f0ca11..07b4a935259cb813e887b98ea6a3e617e4bdb0ff 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -1793,10 +1793,14 @@ void Debug::HandleStepIn(Handle<JSFunction> function,
         // function to be called and not the code for Builtins::FunctionApply or
         // Builtins::FunctionCall. The receiver of call/apply is the target
         // function.
-        if (!holder.is_null() && holder->IsJSFunction() &&
-            !JSFunction::cast(*holder)->IsBuiltin()) {
+        if (!holder.is_null() && holder->IsJSFunction()) {
           Handle<JSFunction> js_function = Handle<JSFunction>::cast(holder);
-          Debug::FloodWithOneShot(js_function);
+          if (!js_function->IsBuiltin()) {
+            Debug::FloodWithOneShot(js_function);
+          } else if (js_function->shared()->bound()) {
+            // Handle Function.prototype.bind
+            Debug::FloodBoundFunctionWithOneShot(js_function);
+          }
         }
       } else {
         Debug::FloodWithOneShot(function);