1 files changed, 60 insertions, 0 deletions
diff --git a/chromium/cc/layers/content_layer_unittest.cc b/chromium/cc/layers/content_layer_unittest.cc
new file mode 100644
index 00000000000..724845883e9
--- /dev/null
+++ b/chromium/cc/layers/content_layer_unittest.cc
@@ -0,0 +1,60 @@
+// Copyright 2012 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.
+
+#include "cc/layers/content_layer.h"
+
+#include "cc/layers/content_layer_client.h"
+#include "cc/resources/bitmap_content_layer_updater.h"
+#include "cc/test/fake_rendering_stats_instrumentation.h"
+#include "cc/test/geometry_test_utils.h"
+#include "skia/ext/platform_canvas.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/rect_conversions.h"
+
+namespace cc {
+namespace {
+
+class MockContentLayerClient : public ContentLayerClient {
+ public:
+  explicit MockContentLayerClient(gfx::Rect opaque_layer_rect)
+      : opaque_layer_rect_(opaque_layer_rect) {}
+
+  virtual void PaintContents(SkCanvas* canvas,
+                             gfx::Rect clip,
+                             gfx::RectF* opaque) OVERRIDE {
+    *opaque = gfx::RectF(opaque_layer_rect_);
+  }
+  virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
+
+ private:
+  gfx::Rect opaque_layer_rect_;
+};
+
+TEST(ContentLayerTest, ContentLayerPainterWithDeviceScale) {
+  float contents_scale = 2.f;
+  gfx::Rect content_rect(10, 10, 100, 100);
+  gfx::Rect opaque_rect_in_layer_space(5, 5, 20, 20);
+  gfx::Rect opaque_rect_in_content_space = gfx::ScaleToEnclosingRect(
+      opaque_rect_in_layer_space, contents_scale, contents_scale);
+  MockContentLayerClient client(opaque_rect_in_layer_space);
+  FakeRenderingStatsInstrumentation stats_instrumentation;
+  scoped_refptr<BitmapContentLayerUpdater> updater =
+      BitmapContentLayerUpdater::Create(
+          ContentLayerPainter::Create(&client).PassAs<LayerPainter>(),
+          &stats_instrumentation,
+          0);
+
+  gfx::Rect resulting_opaque_rect;
+  updater->PrepareToUpdate(content_rect,
+                           gfx::Size(256, 256),
+                           contents_scale,
+                           contents_scale,
+                           &resulting_opaque_rect);
+
+  EXPECT_EQ(opaque_rect_in_content_space.ToString(),
+            resulting_opaque_rect.ToString());
+}
+
+}  // namespace
+}  // namespace cc