Fix errors in fast/canvas/toBlob/canvas-toBlob-defaultpng.html

The dw and dh parameters passed to drawImage should be 300x150, which is the default
size of canvas elment. Otherwise, the image will be scaled when drawing. This is why
the test fails.

BUG=577687

Review URL: https://codereview.chromium.org/1600603002

Cr-Commit-Position: refs/heads/master@{#370070}

1 files changed, 3 insertions, 2 deletions

diff --git a/third_party/WebKit/LayoutTests/fast/canvas/toBlob/canvas-toBlob-defaultpng.html b/third_party/WebKit/LayoutTests/fast/canvas/toBlob/canvas-toBlob-defaultpng.html
index 6f09ee8..c2fec4c 100644
--- a/third_party/WebKit/LayoutTests/fast/canvas/toBlob/canvas-toBlob-defaultpng.html
+++ b/third_party/WebKit/LayoutTests/fast/canvas/toBlob/canvas-toBlob-defaultpng.html
@@ -16,10 +16,11 @@ var ctx2 = canvas2.getContext("2d");
 
 var newImg = new Image();
 newImg.onload = function() {
-    ctx2.drawImage(newImg, 0, 0, 150, 75);
+    // 300x150 is the default size of the canvas, which is the source of the newImg.
+    ctx2.drawImage(newImg, 0, 0, 300, 150);
 
     var imageData1 = ctx.getImageData(0, 0, 150, 75).data;
-    var imageData2 = ctx.getImageData(0, 0, 150, 75).data;
+    var imageData2 = ctx2.getImageData(0, 0, 150, 75).data;
     var imageMatched = true;
     for (var i = 1; i < imageData1.length; i++)
     {