Implements core logic for Pixel Canvas

ui/compositor/compositor_unittest.cc

Index: ui/compositor/compositor_unittest.cc
diff --git a/ui/compositor/compositor_unittest.cc b/ui/compositor/compositor_unittest.cc
index 4378ec91b59b4821b1ca90fd154395adb8660112..4284504b5e27d19c9943dc0dea87a9f0d54e45ab 100644
--- a/ui/compositor/compositor_unittest.cc
+++ b/ui/compositor/compositor_unittest.cc
@@ -40,7 +40,8 @@ class CompositorTest : public testing::Test {
     compositor_.reset(new ui::Compositor(
         context_factory_private->AllocateFrameSinkId(), context_factory,
         context_factory_private, CreateTaskRunner(),
-        false /* enable_surface_synchronization */));
+        false /* enable_surface_synchronization */,
+        false /* enable_pixel_canvas */));
     compositor_->SetAcceleratedWidget(gfx::kNullAcceleratedWidget);
   }