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 991aba5e0ef1b54462bd01258d1991601f1d7db1..4833b4f8139a23fd5e72e49f0997b8f8e62a7f46 100644
--- a/ui/compositor/compositor_switches.cc
+++ b/ui/compositor/compositor_switches.cc
@@ -32,6 +32,11 @@ const char kUIShowPaintRects[] = "ui-show-paint-rects";
 
 const char kUISlowAnimations[] = "ui-slow-animations";
 
+// If enabled, all draw commands 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 https://goo.gl/Dqig5s
+const char kEnablePixelCanvasRecording[] = "enable-pixel-canvas-recording";
+
 }  // namespace switches
 
 namespace ui {
@@ -42,4 +47,11 @@ bool IsUIZeroCopyEnabled() {
   return command_line.HasSwitch(switches::kUIEnableZeroCopy);
 }
 
+bool IsPixelCanvasRecordingEnabled() {
+  static const bool is_pixel_canvas_recording_enabled =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnablePixelCanvasRecording);
+  return is_pixel_canvas_recording_enabled;
+}
+
 }  // namespace ui