Add rec-2020 and p3 color spaces to canvas

third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl

Index: third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl
diff --git a/third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl b/third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl
index ff24c90ab2c05478cb9eabbf3ff8a8934cd9b414..5063c92163f2fff9a292c61ca80ba7058f2f8f36 100644
--- a/third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl
+++ b/third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl
@@ -21,11 +21,14 @@
 //
 // N.B.: Web IDL doesn't support multiple inheritance of dictionaries.
 
+
+enum CanvasColorSpace { "legacy-srgb", "srgb", "linear-rgb", "rec-2020", "p3"};
+
 [PermissiveDictionaryConversion]
 dictionary CanvasContextCreationAttributes {
     // Canvas 2D attributes
     boolean alpha = true;  // Also used for WebGL.
-    [RuntimeEnabled=ExperimentalCanvasFeatures] DOMString colorSpace = "legacy-srgb";
+    [RuntimeEnabled=ExperimentalCanvasFeatures] CanvasColorSpace colorSpace = "legacy-srgb";
 
     // WebGL attributes
     boolean depth = true;