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

webkit/tools/test_shell/webwidget_host_win.cc

Index: webkit/tools/test_shell/webwidget_host_win.cc
===================================================================
--- webkit/tools/test_shell/webwidget_host_win.cc	(revision 9433)
+++ webkit/tools/test_shell/webwidget_host_win.cc	(working copy)
@@ -207,6 +207,11 @@
 }
 
 void WebWidgetHost::Paint() {
+  PaintToCanvas();
+  PaintCanvasToView();
+}
+
+void WebWidgetHost::PaintToCanvas() {
   RECT r;
   GetClientRect(view_, &r);
   gfx::Rect client_rect(r);
@@ -248,8 +253,9 @@
     }
   }
   DCHECK(paint_rect_.IsEmpty());
+}
 
-  // Paint to the screen
+void WebWidgetHost::PaintCanvasToView() {
   PAINTSTRUCT ps;
   BeginPaint(view_, &ps);
   canvas_->getTopPlatformDevice().drawToHDC(ps.hdc,
@@ -262,6 +268,16 @@
   UpdateWindow(view_);
 }
 
+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::Resize(LPARAM lparam) {
   // Force an entire re-paint.  TODO(darin): Maybe reuse this memory buffer.
   DiscardBackingStore();