Add support for the "repaint" layout tests (LayoutTests/fast/repaint/*), whic...

webkit/tools/test_shell/webwidget_host_gtk.cc

Index: webkit/tools/test_shell/webwidget_host_gtk.cc
===================================================================
--- webkit/tools/test_shell/webwidget_host_gtk.cc	(revision 9433)
+++ webkit/tools/test_shell/webwidget_host_gtk.cc	(working copy)
@@ -278,6 +278,11 @@
 }
 
 void WebWidgetHost::Paint() {
+  PaintToCanvas();
+  PaintCanvasToView();
+}
+
+void WebWidgetHost::PaintToCanvas() {
   int width = view_->allocation.width;
   int height = view_->allocation.height;
   gfx::Rect client_rect(width, height);
@@ -316,14 +321,17 @@
   }
   DCHECK(paint_rect_.IsEmpty());
 
+}
+
+void WebWidgetHost::PaintCanvasToView() {
   // Invalidate the paint region on the widget's underlying gdk window. Note
   // that gdk_window_invalidate_* will generate extra expose events, which
   // we wish to avoid. So instead we use calls to begin_paint/end_paint.
   GdkRectangle grect = {
-      total_paint.x(),
-      total_paint.y(),
-      total_paint.width(),
-      total_paint.height(),
+      0,
+      0,
+      canvas_->width(),
+      canvas_->height(),
   };
   GdkWindow* window = view_->window;
   gdk_window_begin_paint_rect(window, &grect);
@@ -340,6 +348,16 @@
   gdk_window_end_paint(window);
 }
 
+void WebWidgetHost::DisplayForRepaint() {
+  PaintToCanvas();
+
+  // Paint a gray mask over everything for the repaint Layout tests.
+  const SkColor kMaskColor = SkColorSetARGB(168, 0, 0, 0);  // alpha=0.66
+  canvas_->drawColor(kMaskColor, SkPorterDuff::kSrcOver_Mode);
+
+  PaintCanvasToView();
+}
+
 void WebWidgetHost::ResetScrollRect() {
   // This method is only needed for optimized scroll painting, which we don't
   // care about in the test shell, yet.