Implements core logic for Pixel Canvas

ui/compositor/test/test_compositor_host_win.cc

Index: ui/compositor/test/test_compositor_host_win.cc
diff --git a/ui/compositor/test/test_compositor_host_win.cc b/ui/compositor/test/test_compositor_host_win.cc
index cbf1d4830fbba5f95d64f6b4cdc959ddb54f29a9..c2e90b0813acc4e7467954514d884204f617d524 100644
--- a/ui/compositor/test/test_compositor_host_win.cc
+++ b/ui/compositor/test/test_compositor_host_win.cc
@@ -24,7 +24,8 @@ class TestCompositorHostWin : public TestCompositorHost,
     compositor_.reset(new ui::Compositor(
         context_factory_private->AllocateFrameSinkId(), context_factory,
         context_factory_private, base::ThreadTaskRunnerHandle::Get(),
-        false /* enable_surface_synchronization */));
+        false /* enable_surface_synchronization */,
+        false /* enable_pixel_canvas */));
     compositor_->SetAcceleratedWidget(hwnd());
     compositor_->SetScaleAndSize(1.0f, GetSize());
   }