cc: Add pixel tests for PictureDrawQuad

cc/test/fake_picture_pile_impl.cc

Index: cc/test/fake_picture_pile_impl.cc
diff --git a/cc/test/fake_picture_pile_impl.cc b/cc/test/fake_picture_pile_impl.cc
index 9c58313c25fc225f3e82ae2cb49806cab0ab916f..15c1d17e886f654cf26d974bee95103adb0ca614 100644
--- a/cc/test/fake_picture_pile_impl.cc
+++ b/cc/test/fake_picture_pile_impl.cc
@@ -80,4 +80,13 @@ void FakePicturePileImpl::RemoveRecordingAt(int x, int y) {
   UpdateRecordedRegion();
 }
 
+void FakePicturePileImpl::RerecordPile() {
+  for (int y = 0; y < num_tiles_y(); ++y) {
+    for (int x = 0; x < num_tiles_x(); ++x) {
+      RemoveRecordingAt(x, y);
+      AddRecordingAt(x, y);
+    }
+  }
+}
+
 }  // namespace cc