Implement HTMLCanvasElement's transferControlToOffscreen

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DTest.cpp

Index: third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DTest.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DTest.cpp b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DTest.cpp
index 3ab020a9f880b3752e362ac5e121fd7da50ef3e8..bc53fef463a0b9ff43b7360012e4c5f10fdb0ffd 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DTest.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DTest.cpp
@@ -13,8 +13,10 @@
 #include "core/imagebitmap/ImageBitmapOptions.h"
 #include "core/loader/EmptyClients.h"
 #include "core/testing/DummyPageHolder.h"
+#include "modules/canvas/HTMLCanvasElementModule.h"
 #include "modules/canvas2d/CanvasGradient.h"
 #include "modules/canvas2d/CanvasPattern.h"
+#include "modules/offscreencanvas/OffscreenCanvas.h"
 #include "modules/webgl/WebGLRenderingContext.h"
 #include "platform/graphics/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/RecordingImageBufferSurface.h"
@@ -719,4 +721,12 @@ TEST_F(CanvasRenderingContext2DTest, GPUMemoryUpdateForAcceleratedCanvas)
     EXPECT_EQ(0, getGlobalGPUMemoryUsage());
 }
 
+TEST_F(CanvasRenderingContext2DTest, TransferControlToOffscreen)

[Justin Novosad, 2016/03/30 19:51:06]

Good test, but wrong place for it. It has nothing to do with 2D contexts.  I
think a new source file is in order. Ideally it should be in the same module as
the code it tests.
third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp would
make sense IMHO

+{
+    NonThrowableExceptionState exceptionState;
+    OffscreenCanvas* offscreenCanvas = HTMLCanvasElementModule::transferControlToOffscreen(canvasElement(), exceptionState);
+    HTMLCanvasElement* canvas = offscreenCanvas->getAssociatedCanvas();
+    EXPECT_EQ(canvas, canvasElement());
+}
+
 } // namespace blink