Update scaling of video layers on every swap.

gpu/ipc/service/direct_composition_surface_win_unittest.cc

Index: gpu/ipc/service/direct_composition_surface_win_unittest.cc
diff --git a/gpu/ipc/service/direct_composition_surface_win_unittest.cc b/gpu/ipc/service/direct_composition_surface_win_unittest.cc
index f60de060b0e3212ab5c81c0039fe8698aa3155f7..432251d9b0c1759af7cdceeda43f0ec3bcc816c0 100644
--- a/gpu/ipc/service/direct_composition_surface_win_unittest.cc
+++ b/gpu/ipc/service/direct_composition_surface_win_unittest.cc
@@ -493,13 +493,25 @@ TEST_F(DirectCompositionPixelTest, VideoSwapchain) {
       new gl::GLImageDXGI(texture_size, nullptr));
   image_dxgi->SetTexture(texture, 0);
 
-  ui::DCRendererLayerParams params(false, gfx::Rect(), 1, gfx::Transform(),
-                                   image_dxgi.get(),
-                                   gfx::RectF(gfx::Rect(texture_size)),
-                                   gfx::Rect(window_size), 0, 0, 1.0, 0);
+  ui::DCRendererLayerParams params(
+      false, gfx::Rect(), 1, gfx::Transform(),
+      image_dxgi.get(),
+      gfx::RectF(gfx::Rect(texture_size)), gfx::Rect(texture_size), 0, 0, 1.0,
+      0);
   surface_->ScheduleDCLayer(params);
 
   EXPECT_EQ(gfx::SwapResult::SWAP_ACK, surface_->SwapBuffers());
+
+  // Scaling up the swapchain with the same image should cause it to be
+  // transformed again, but not presented again.
+  ui::DCRendererLayerParams params2(
+      false, gfx::Rect(), 1, gfx::Transform(),
+      image_dxgi.get(),
+      gfx::RectF(gfx::Rect(texture_size)), gfx::Rect(window_size), 0, 0, 1.0,
+      0);
+  surface_->ScheduleDCLayer(params2);
+
+  EXPECT_EQ(gfx::SwapResult::SWAP_ACK, surface_->SwapBuffers());
   Sleep(1000);
 
   SkColor expected_color = SkColorSetRGB(0xff, 0xb7, 0xff);