Make the canvas in race layout test smaller

BUG=536293

Review URL: https://codereview.chromium.org/1375573002

Cr-Commit-Position: refs/heads/master@{#351121}

third_party/WebKit/LayoutTests/MSANExpectations

@@ -60,17 +60,6 @@ crbug.com/522376 [ Linux ] virtual/gpu/fast/canvas/canvas-filter-shadow.html [ C
 crbug.com/522376 [ Linux ] virtual/gpu/fast/canvas/canvas-incremental-repaint.html [ Crash ]
 crbug.com/522376 [ Linux ] virtual/gpu/fast/canvas/canvas-scale-drawImage-shadow.html [ Crash ]
 
-# These tests may require more time to execute
-crbug.com/536293 [ Linux ] virtual/gpu/fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-png.html [ Timeout ]
-crbug.com/536293 [ Linux ] virtual/display_list_2d_canvas/fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-jpeg.html [ Timeout ]
-crbug.com/536293 [ Linux ] virtual/display_list_2d_canvas/fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-webp.html [ Timeout ]
-crbug.com/536293 [ Linux ] virtual/gpu/fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-webp.html [ Timeout ]
-crbug.com/536293 [ Linux ] fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-png.html [ Timeout ]
-crbug.com/536293 [ Linux ] fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-jpeg.html [ Timeout ]
-crbug.com/536293 [ Linux ] virtual/display_list_2d_canvas/fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-png.html [ Timeout ]
-crbug.com/536293 [ Linux ] virtual/gpu/fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-jpeg.html [ Timeout ]
-crbug.com/536293 [ Linux ] fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-webp.html [ Timeout ]
-
 # Flaky under MSAN (hang forever)
 crbug.com/456525 [ Linux ] inspector/sources/debugger [ Skip ]
 

third_party/WebKit/LayoutTests/fast/canvas/script-tests/canvas-toBlob-toDataURL-race.js

@@ -12,16 +12,16 @@ var canvasCtxs = [];
 var canvas = document.createElement("canvas");
 var ctx = canvas.getContext("2d");
 ctx.fillStyle = "#EE21AF";
-ctx.fillRect(0, 0, 2500, 1750);
+ctx.fillRect(0, 0, 250, 150);
 
 function testIfAllImagesAreCorrect()
 {
     // All resultant images should be the same as both async and main threads use the same image encoder
     var imageMatched = true;
-    var firstImageData = canvasCtxs[0].getImageData(0, 0, 2500, 1750).data;
+    var firstImageData = canvasCtxs[0].getImageData(0, 0, 250, 150).data;
     for (var i = 1; i < (numToBlobCalls + numToDataURLCalls); i++) 
     {
-        var nextImageData = canvasCtxs[i].getImageData(0, 0, 2500, 1750).data;
+        var nextImageData = canvasCtxs[i].getImageData(0, 0, 250, 150).data;
         for (var k = 0; k < firstImageData.length; k++) 
         {
             if (firstImageData[k]!=nextImageData[k]) 
@@ -58,7 +58,7 @@ function createTestCase(i)
 
     var newImg = new Image();
     newImg.onload = function() {
-        ctx_test.drawImage(newImg, 0, 0, 2500, 1750);
+        ctx_test.drawImage(newImg, 0, 0, 250, 150);
         onCanvasDrawCompleted(ctx_test);
     }    
     testImages[i] = newImg;