Adding nullability support to ImageBitmapRenderingContext.transferImageBitmap

third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.cpp

Index: third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.cpp
diff --git a/third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.cpp b/third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.cpp
index 20b6491e85010f2bf0c79c649415f7e6e0351a80..da01d05da34c31c42930c9f8750b29491e36b2aa 100644
--- a/third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.cpp
+++ b/third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.cpp
@@ -27,6 +27,9 @@ void ImageBitmapRenderingContext::setCanvasGetContextResult(RenderingContext& re
 
 void ImageBitmapRenderingContext::transferFromImageBitmap(ImageBitmap* imageBitmap)
 {
+    if (!imageBitmap)
+        return;

[Justin Novosad, 2016/08/16 19:38:55]

This is not the correct behavior. Passing null is supposed to reset the contents
of the canvas.

[zakerinasab, 2016/08/16 20:34:49]

Done.

+
     m_image = imageBitmap->bitmapImage();
     if (!m_image)
         return;