Implements core logic for Pixel Canvas

ui/compositor/compositor_switches.cc

Index: ui/compositor/compositor_switches.cc
diff --git a/ui/compositor/compositor_switches.cc b/ui/compositor/compositor_switches.cc
index 2a999a81a5094f05a9ba629feafdf8220f444ed4..914942356e760f147104eccd15d19e7a90a2ad20 100644
--- a/ui/compositor/compositor_switches.cc
+++ b/ui/compositor/compositor_switches.cc
@@ -28,6 +28,11 @@ const char kUIShowPaintRects[] = "ui-show-paint-rects";
 
 const char kUISlowAnimations[] = "ui-slow-animations";
 
+// If enabled, all draw commnads recorded on canvas are done in pixel aligned
+// measurements. This also enables scaling of all elements in views and layers
+// to be done via corner points. See go/pixel-canvas
+const char kEnablePixelCanvasRecording[] = "enable-pixel-canvas-recording";
+
 }  // namespace switches
 
 namespace ui {