Match html canvas which is transferred to OffscreenCanvas to CSS style

cc/layers/surface_layer_impl_unittest.cc

Index: cc/layers/surface_layer_impl_unittest.cc
diff --git a/cc/layers/surface_layer_impl_unittest.cc b/cc/layers/surface_layer_impl_unittest.cc
index ea556d8dae165f109aa62c55536b2e1ab792abc7..33d8b49ba785f5d8cdd9a42c22a575775d6abf2e 100644
--- a/cc/layers/surface_layer_impl_unittest.cc
+++ b/cc/layers/surface_layer_impl_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <stddef.h>
 
+#include "cc/layers/append_quads_data.h"
 #include "cc/test/layer_test_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -66,5 +67,38 @@ TEST(SurfaceLayerImplTest, Occlusion) {
   }
 }
 
+TEST(SurfaceLayerImplTest, LayerBoundsDiffFromSurfaceLayerSize) {
+  LayerTestCommon::LayerImplTest impl;
+  SurfaceLayerImpl* surface_layer_impl =
+      impl.AddChildToRoot<SurfaceLayerImpl>();
+  const LocalFrameId kArbitraryLocalFrameId(9,
+                                            base::UnguessableToken::Create());
+
+  gfx::Size layer_size(100, 300);
+  gfx::Size surface_size(350, 350);
+  float surface_scale = 2.f;
+  surface_layer_impl->SetBounds(layer_size);
+  surface_layer_impl->SetDrawsContent(true);
+  SurfaceId surface_id(kArbitraryFrameSinkId, kArbitraryLocalFrameId);
+  surface_layer_impl->SetSurfaceId(surface_id);
+  surface_layer_impl->SetSurfaceScale(surface_scale);
+  surface_layer_impl->SetSurfaceSize(surface_size);
+
+  std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
+  AppendQuadsData data;
+  surface_layer_impl->AppendQuads(render_pass.get(), &data);
+
+  const QuadList& quads = render_pass->quad_list;
+  ASSERT_EQ(1u, quads.size());
+  EXPECT_EQ(DrawQuad::SURFACE_CONTENT, quads.front()->material);
+  const SharedQuadState* shared_quad_state = quads.front()->shared_quad_state;
+
+  gfx::Transform transform;
+  float scale_x = 350.f / 100.f;
+  float scale_y = 350.f / 300.f;
+  transform.Scale(SK_MScalar1 / scale_x, SK_MScalar1 / scale_y);
+  EXPECT_EQ(transform, shared_quad_state->quad_to_target_transform);
+}
+
 }  // namespace
 }  // namespace cc