Tweaks to canvas perf tests to make them stay on the GPU

third_party/WebKit/PerformanceTests/Canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html

Index: third_party/WebKit/PerformanceTests/Canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html
diff --git a/third_party/WebKit/PerformanceTests/Canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html b/third_party/WebKit/PerformanceTests/Canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html
index fa221baec7e872d42ba36cd88430f39a8751bbef..56dbe559196ab09e91a2133386f1961ead971a16 100644
--- a/third_party/WebKit/PerformanceTests/Canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html
+++ b/third_party/WebKit/PerformanceTests/Canvas/draw-dynamic-canvas-2d-to-hw-accelerated-canvas-2d.html
@@ -11,14 +11,13 @@ var destCtx2D = destCanvas2D.getContext("2d");
 var dummyCanvas2D = document.createElement("canvas");
 var dummyCtx2D = dummyCanvas2D.getContext("2d");
 
-dummyCanvas2D.width = 1;
-dummyCanvas2D.height = 1;
-
 function setSize(sourceWidth, sourceHeight, destWidth, destHeight) {
     sourceCanvas2D.width = sourceWidth;
     sourceCanvas2D.height = sourceHeight;
     destCanvas2D.width = destWidth;
     destCanvas2D.height = destHeight;
+    dummyCanvas2D.width = destWidth;
+    dummyCanvas2D.height = destHeight;
 }
 
 function rand(range) {