Fixing performance issue of creating imagebitmap from ImageData

third_party/WebKit/Source/core/frame/ImageBitmap.cpp

Index: third_party/WebKit/Source/core/frame/ImageBitmap.cpp
diff --git a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
index 62388bc0fb578bd02059e4556ea598892a587f45..100ce271b6adbedbd69b6ce1f4701d9ab15ca908 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
@@ -98,7 +98,9 @@ ImageBitmap::ImageBitmap(ImageData* data, const IntRect& cropRect)
     , m_bitmapOffset(IntPoint())
 {
     IntRect srcRect = intersection(cropRect, IntRect(IntPoint(), data->size()));
-    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(data->size());
+    OpacityMode opacityMode = Opaque;
+    ImageBitmapSourceType sourceType = FromImageData;

[Justin Novosad, 2015/10/14 14:25:28]

No need to use temporaries like this when you already have nicely named enum
types.

+    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(data->size(), opacityMode, sourceType);
     if (!buffer)
         return;