Implementation of 2D canvas context lost/restored events

LayoutTests/virtual/gpu/fast/canvas/canvas-lost-gpu-context-expected.txt

Index: LayoutTests/virtual/gpu/fast/canvas/canvas-lost-gpu-context-expected.txt
diff --git a/LayoutTests/virtual/gpu/fast/canvas/canvas-lost-gpu-context-expected.txt b/LayoutTests/virtual/gpu/fast/canvas/canvas-lost-gpu-context-expected.txt
index 34fb462c616aee7b89658ddeda7b53932dcc42a5..8f9b55a3c07eba8cb49a9bad401b35b68f273b3f 100644
--- a/LayoutTests/virtual/gpu/fast/canvas/canvas-lost-gpu-context-expected.txt
+++ b/LayoutTests/virtual/gpu/fast/canvas/canvas-lost-gpu-context-expected.txt
@@ -3,16 +3,17 @@ Test the behavior of canvas recovery after a gpu context loss
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS imgdata[0] is 255
-PASS imgdata[1] is 0
-PASS imgdata[2] is 0
-PASS imgdata[3] is 255
-PASS imgdata[0] is 0
-PASS imgdata[1] is 0
-PASS imgdata[2] is 0
-PASS imgdata[3] is 0
+PASS contextLostTest is false
+PASS ctx.isContextLost() is false
+PASS contextLostTest is true
+PASS ctx.isContextLost() is true
 PASS successfullyParsed is true
 
 TEST COMPLETE
-PASS Graphics context recovered.
+PASS Graphics context lost event dispatched.
+PASS contextLostTest is true
+PASS ctx.isContextLost() is true
+PASS Context restored event dispatched after context lost.
+PASS contextLostTest is false
+PASS ctx.isContextLost() is false