Implement layoutTestController.display() method....

webkit/tools/test_shell/webwidget_host.h

 // Copyright (c) 2006-2008 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 WEBKIT_TOOLS_TEST_SHELL_WEBWIDGET_HOST_H_
 #define WEBKIT_TOOLS_TEST_SHELL_WEBWIDGET_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/gfx/native_widget_types.h"
 #include "base/gfx/rect.h"
@@ skipping 43 matching lines @@
   void DiscardBackingStore();
   // Allow clients to update the paint rect. For example, if we get a gdk
   // expose or WM_PAINT event, we need to update the paint rect.
   void UpdatePaintRect(const gfx::Rect& rect);
   void Paint();
 
   skia::PlatformCanvas* canvas() const { return canvas_.get(); }
 
   WebKit::WebScreenInfo GetScreenInfo();
 
+  // Paints the entire canvas a semi-transparent black (grayish). This is used
+  // by the layout tests in fast/repaint. The alpha value matches upstream.
+  void DisplayRepaintMask() {
+    canvas()->drawARGB(167, 0, 0, 0);
+  }
+
  protected:
   WebWidgetHost();
   ~WebWidgetHost();
 
 #if defined(OS_WIN)
   // Per-class wndproc.  Returns true if the event should be swallowed.
   virtual bool WndProc(UINT message, WPARAM wparam, LPARAM lparam);
 
   void Resize(LPARAM lparam);
   void MouseEvent(UINT message, WPARAM wparam, LPARAM lparam);
@@ skipping 52 matching lines @@
   int scroll_dy_;
 
   bool track_mouse_leave_;
 
 #ifndef NDEBUG
   bool painting_;
 #endif
 };
 
 #endif  // WEBKIT_TOOLS_TEST_SHELL_WEBWIDGET_HOST_H_