[BUG REPRO ONLY] Demonstrates texture reuse for mask layers

ash/common/wm/overview/scoped_transform_overview_window.cc

Index: ash/common/wm/overview/scoped_transform_overview_window.cc
diff --git a/ash/common/wm/overview/scoped_transform_overview_window.cc b/ash/common/wm/overview/scoped_transform_overview_window.cc
index ca1974343fc8cc04797ae5dae6cc593286b98d7c..7dee4306c9e3e9c489ac6c6f2851c28662ed7c01 100644
--- a/ash/common/wm/overview/scoped_transform_overview_window.cc
+++ b/ash/common/wm/overview/scoped_transform_overview_window.cc
@@ -16,6 +16,7 @@
 #include "ash/common/wm_window_property.h"
 #include "base/macros.h"
 #include "base/single_thread_task_runner.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
@@ -213,29 +214,18 @@ ScopedTransformOverviewWindow::OverviewContentMask::~OverviewContentMask() {
 void ScopedTransformOverviewWindow::OverviewContentMask::OnPaintLayer(
     const ui::PaintContext& context) {
   ui::PaintRecorder recorder(context, layer()->size());
-  gfx::Rect bounds(layer()->bounds().size());
-  bounds.Inset(0, inset_, 0, 0);
-
-  // Tile a window into an area, rounding the bottom corners.
-  const SkRect rect = gfx::RectToSkRect(bounds);
-  const SkScalar corner_radius_scalar = SkIntToScalar(radius_);
-  SkScalar radii[8] = {0,
-                       0,  // top-left
-                       0,
-                       0,  // top-right
-                       corner_radius_scalar,
-                       corner_radius_scalar,  // bottom-right
-                       corner_radius_scalar,
-                       corner_radius_scalar};  // bottom-left
-  SkPath path;
-  path.addRoundRect(rect, radii, SkPath::kCW_Direction);
-
-  // Set a mask.
-  SkPaint paint;
-  paint.setAlpha(kOverviewContentMaskAlpha);
-  paint.setStyle(SkPaint::kFill_Style);
-  paint.setAntiAlias(true);
-  recorder.canvas()->DrawPath(path, paint);
+
+  (void)inset_;
+  (void)radius_;
+  (void)kOverviewContentMaskAlpha;
+
+  LOG(ERROR) << __FUNCTION__ << " id=" << layer_.cc_layer_for_testing()->id();
+  gfx::Rect bounds(50, 10 * (layer_.cc_layer_for_testing()->id() % 10), 100,
+                   100);
+  std::string txt = std::to_string(layer_.cc_layer_for_testing()->id());
+  base::string16 text(base::UTF8ToUTF16(txt));
+  recorder.canvas()->DrawStringRect(text, gfx::FontList(), SK_ColorWHITE,
+                                    bounds);
 }
 
 void ScopedTransformOverviewWindow::OverviewContentMask::