ResizeSynchronously should resize the visible viewport as well.

content/renderer/render_widget.h

 // Copyright (c) 2012 The Chromium 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 CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 382 matching lines @@
   // Resizes the render widget.
   void Resize(const gfx::Size& new_size,
               const gfx::Size& physical_backing_size,
               bool top_controls_shrink_blink_size,
               float top_controls_height,
               const gfx::Size& visible_viewport_size,
               const gfx::Rect& resizer_rect,
               bool is_fullscreen,
               ResizeAck resize_ack);
   // Used to force the size of a window when running layout tests.
-  void ResizeSynchronously(
-      const gfx::Rect& new_position,
-      const gfx::Size& visible_viewport_size);
+  void SetWindowRectSynchronously(const gfx::Rect& new_window_rect);
   virtual void SetScreenMetricsEmulationParameters(
       float device_scale_factor,
       const gfx::Point& root_layer_offset,
       float root_layer_scale);
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   void SetExternalPopupOriginAdjustmentsForEmulation(
       ExternalPopupMenu* popup, ScreenMetricsEmulator* emulator);
 #endif
 
   // RenderWidget IPC message handlers
@@ skipping 197 matching lines @@
 
   // Set to the ID of the view that initiated creating this view, if any. When
   // the view was initiated by the browser (the common case), this will be
   // MSG_ROUTING_NONE. This is used in determining ownership when opening
   // child tabs. See RenderWidget::createWebViewWithRequest.
   //
   // This ID may refer to an invalid view if that view is closed before this
   // view is.
   int32 opener_id_;
 
-  // The position where this view should be initially shown.
-  gfx::Rect initial_pos_;
+  // The rect where this view should be initially shown.
+  gfx::Rect initial_rect_;
 
   bool init_complete_;
 
   // We store the current cursor object so we can avoid spamming SetCursor
   // messages.
   WebCursor current_cursor_;
 
   // The size of the RenderWidget.
   gfx::Size size_;
 
@@ skipping 178 matching lines @@
   ui::MenuSourceType context_menu_source_type_;
   bool has_host_context_menu_location_;
   gfx::Point host_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_