Establish mojo service between Canvas (blink) and SurfaceManager (browser)

third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html

Index: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
index 36ba020363fc99fa734b309e3289ba04a3d5b0df..1f168cd124324c8a82ff27d9f6db821eb8bc86dc 100644
--- a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
+++ b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferControlToOffscreen.html
@@ -9,19 +9,33 @@
 description("Test transferControlToOffscreen.");
 window.jsTestIsAsync = true;
 
+function createCanvas(width, height) {
+    var canvas = document.createElement("canvas");
+    canvas.width = width;
+    canvas.height = height;
+    return canvas;
+}
+
+// Tests whether transferControlToOffscreen can be run correctly.
 var width = 50;
 var height = 50;
-var canvas = document.createElement("canvas");
-canvas.width = width;
-canvas.height = height;
-
-var offscreenCanvas = canvas.transferControlToOffscreen();
-shouldBe("offscreenCanvas.width", "width");
-shouldBe("offscreenCanvas.height", "height");
+var canvas1 = createCanvas(width, height);
+var offscreenCanvas1;
+try {
+    offscreenCanvas1 = canvas1.transferControlToOffscreen();
+    testPassed("Successfully created layer for offscreencanvas");
+    shouldBe("offscreenCanvas1.width", "width");
+    shouldBe("offscreenCanvas1.height", "height");
+} catch (ex) {
+    testFailed(ex.message);
+}
 
-var ctx = canvas.getContext("2d");
+// Tests whether transferControlToOffscreen throws exception correctly. 
+var canvas2 = createCanvas(50, 50);
+var offscreenCanvas2;
+var ctx = canvas2.getContext("2d");
 try {
-    offscreenCanvas = canvas.transferControlToOffscreen();
+    offscreenCanvas2 = canvas2.transferControlToOffscreen();
     testFailed("transferControlToOffscreen from a canvas with context didn't throw an exception.");
 } catch (ex) {
     testPassed("transferControlToOffscreen from a canvas with context throws an exception: " + ex);