[debugger] refactor debug-scopes.

src/debug/debug-scopes.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DEBUG_DEBUG_SCOPES_H_
 #define V8_DEBUG_DEBUG_SCOPES_H_
 
 #include "src/debug/debug-frames.h"
 #include "src/frames.h"
 
@@ skipping 112 matching lines @@
   bool SetLocalVariableValue(Handle<String> variable_name,
                              Handle<Object> new_value);
   bool SetBlockVariableValue(Handle<String> variable_name,
                              Handle<Object> new_value);
   bool SetClosureVariableValue(Handle<String> variable_name,
                                Handle<Object> new_value);
   bool SetScriptVariableValue(Handle<String> variable_name,
                               Handle<Object> new_value);
   bool SetCatchVariableValue(Handle<String> variable_name,
                              Handle<Object> new_value);
-  bool SetContextLocalValue(Handle<ScopeInfo> scope_info,
-                            Handle<Context> context,
-                            Handle<String> variable_name,
-                            Handle<Object> new_value);
+
+  // Helper functions.
+  bool SetParameterValue(Handle<ScopeInfo> scope_info, JavaScriptFrame* frame,
+                         Handle<String> parameter_name,
+                         Handle<Object> new_value);
+  bool SetStackVariableValue(Handle<ScopeInfo> scope_info,
+                             JavaScriptFrame* frame,
+                             Handle<String> variable_name,
+                             Handle<Object> new_value);
+  bool SetContextVariableValue(Handle<ScopeInfo> scope_info,
+                               Handle<Context> context,
+                               Handle<String> variable_name,
+                               Handle<Object> new_value);
 
   void CopyContextLocalsToScopeObject(Handle<ScopeInfo> scope_info,
                                       Handle<Context> context,
                                       Handle<JSObject> scope_object);
   bool CopyContextExtensionToScopeObject(Handle<JSObject> extension,
                                          Handle<JSObject> scope_object,
                                          KeyCollectionType type);
 
   // Get the chain of nested scopes within this scope for the source statement
   // position. The scopes will be added to the list from the outermost scope to
   // the innermost scope. Only nested block, catch or with scopes are tracked
   // and will be returned, but no inner function scopes.
   void GetNestedScopeChain(Isolate* isolate, Scope* scope,
                            int statement_position);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ScopeIterator);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_SCOPES_H_