Implement canvas color space IDL format for 2D 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 5063c92163f2fff9a292c61ca80ba7058f2f8f36..752714c9933030067cfca095ed98cc013c442255 100644
--- a/third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl
+++ b/third_party/WebKit/Source/core/html/canvas/CanvasContextCreationAttributes.idl
@@ -21,14 +21,28 @@
 //
 // N.B.: Web IDL doesn't support multiple inheritance of dictionaries.
 
+enum CanvasColorSpace {
+    "srgb", // default
+    "rec2020",
+    "p3",
+};
 
-enum CanvasColorSpace { "legacy-srgb", "srgb", "linear-rgb", "rec-2020", "p3"};
+enum CanvasPixelFormat {
+    "8-8-8-8", // default
+    "10-10-10-2",
+    "12-12-12-12",
+    "float16",
+};
 
 [PermissiveDictionaryConversion]
 dictionary CanvasContextCreationAttributes {
     // Canvas 2D attributes
     boolean alpha = true;  // Also used for WebGL.
+    // TODO(crbug.com/637288): Do we keep "legacy-srgb" as the default?
+    // Must decide before shipping.
     [RuntimeEnabled=ExperimentalCanvasFeatures] CanvasColorSpace colorSpace = "legacy-srgb";
+    [RuntimeEnabled=ExperimentalCanvasFeatures] CanvasPixelFormat pixelFormat = "8-8-8-8";
+    [RuntimeEnabled=ExperimentalCanvasFeatures] boolean linearPixelMath = false;
 
     // WebGL attributes
     boolean depth = true;