Handle resize corner layout entirely in the platform BrowserWindow*/BrowserView* code...

chrome/browser/renderer_host/render_widget_host_view.h

 // Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #pragma once
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
 #endif
 
 #include <string>
 #include <vector>
 
 #include "app/surface/transport_dib.h"
 #include "gfx/native_widget_types.h"
+#include "gfx/rect.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebPopupType.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebTextInputType.h"
 
 namespace gfx {
 class Rect;
 class Size;
 }
 namespace IPC {
 class Message;
@@ skipping 229 matching lines @@
   // Returns true if the native view, |native_view|, is contained within in the
   // widget associated with this RenderWidgetHostView.
   virtual bool ContainsNativeView(gfx::NativeView native_view) const = 0;
 
   virtual void UpdateAccessibilityTree(
       const webkit_glue::WebAccessibility& tree) { }
   virtual void OnAccessibilityNotifications(
       const std::vector<ViewHostMsg_AccessibilityNotification_Params>& params) {
   }
 
+  gfx::Rect reserved_contents_rect() const {
+    return reserved_rect_;
+  }
+  void set_reserved_contents_rect(const gfx::Rect& reserved_rect) {
+    reserved_rect_ = reserved_rect;
+  }
+
  protected:
   // Interface class only, do not construct.
   RenderWidgetHostView() : popup_type_(WebKit::WebPopupTypeNone) {}
 
   // Whether this view is a popup and what kind of popup it is (select,
   // autofill...).
   WebKit::WebPopupType popup_type_;
 
   // A custom background to paint behind the web content. This will be tiled
   // horizontally. Can be null, in which case we fall back to painting white.
   SkBitmap background_;
 
+  // The current reserved area in view coordinates where contents should not be
+  // rendered to draw the resize corner, sidebar mini tabs etc.
+  gfx::Rect reserved_rect_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostView);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_