Implements core logic for Pixel Canvas

ui/compositor/compositor_switches.h

Index: ui/compositor/compositor_switches.h
diff --git a/ui/compositor/compositor_switches.h b/ui/compositor/compositor_switches.h
index 54fc33542171d9ac5d52b27939fbfd5f48ed222f..9f669a4633b6d37ffa0ea510b3711eb8c7172838 100644
--- a/ui/compositor/compositor_switches.h
+++ b/ui/compositor/compositor_switches.h
@@ -17,6 +17,7 @@ COMPOSITOR_EXPORT extern const char kUIEnableRGBA4444Textures[];
 COMPOSITOR_EXPORT extern const char kUIEnableZeroCopy[];
 COMPOSITOR_EXPORT extern const char kUIShowPaintRects[];
 COMPOSITOR_EXPORT extern const char kUISlowAnimations[];
+COMPOSITOR_EXPORT extern const char kEnablePixelCanvasRecording[];
 
 }  // namespace switches
 
@@ -24,6 +25,8 @@ namespace ui {
 
 bool IsUIZeroCopyEnabled();
 
+bool COMPOSITOR_EXPORT IsPixelCanvasRecordingEnabled();
+
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_SWITCHES_H_