Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage-with-options.html

Index: third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage-with-options.html
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage-with-options.html b/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage-with-options.html
index dd8d311af442f7a5ccc153040e7d803224a4f78d..d7a5bdc7bb7d89e4b71ea9809da1896853c4f5d2 100644
--- a/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage-with-options.html
+++ b/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage-with-options.html
@@ -163,10 +163,10 @@ function loaded() {
         // check all elements
         elements = [image, aCanvas, d, testBitmap, blob];
         imageOrientationOptions = ["none", "flipY", "invalid"];
-        premultiplyAlphaOptions = ["default", "none", "invalid"];
-        optionIndexArray = [[0, 0], [0, 1], [0, 2],
-                            [1, 0], [1, 1], [1, 2],
-                            [2, 0], [2, 1], [2, 2]];
+        premultiplyAlphaOptions = ["default", "none", "premultiply", "invalid"];
+        optionIndexArray = [[0, 0], [0, 1], [0, 2], [0, 3],
+                            [1, 0], [1, 1], [1, 2], [1, 3],
+                            [2, 0], [2, 1], [2, 2], [2, 3]];
         // wait for callback to finish before each check to ensure synchronous behavior
         nextCheck(0, 0);
     }
@@ -207,8 +207,7 @@ function nextCheck(elementIndex, optionIndex) {
             nextCheck(elementIndex, optionIndex + 1);
     }, function() {
         // when the options are invalid, we expect the promise to be rejected.
-        if ((imageOrientationOptions[optionIndex1] != "none" && imageOrientationOptions[optionIndex1] != "flipY") ||
-            (premultiplyAlphaOptions[optionIndex2] != "default" && premultiplyAlphaOptions[optionIndex2] != "none")) {
+        if (imageOrientationOptions[optionIndex1] == "invalid" || premultiplyAlphaOptions[optionIndex2] == "invalid") {
             testPassed("createImageBitmap with invalid options are rejected");
             if (optionIndex == optionIndexArray.length - 1)
                 nextCheck(elementIndex + 1, 0);