Unit test for non-default orientation images which don't produce pixels.

Source/platform/graphics/BitmapImage.cpp

Index: Source/platform/graphics/BitmapImage.cpp
diff --git a/Source/platform/graphics/BitmapImage.cpp b/Source/platform/graphics/BitmapImage.cpp
index 74a69778c19efa716f4ab7dd6d08ac4a117b6fc3..7d674be144ce55f8f30640e5829cd16dfc5706e2 100644
--- a/Source/platform/graphics/BitmapImage.cpp
+++ b/Source/platform/graphics/BitmapImage.cpp
@@ -48,6 +48,15 @@ PassRefPtr<BitmapImage> BitmapImage::create(PassRefPtr<NativeImageSkia> nativeIm
     return adoptRef(new BitmapImage(nativeImage, observer));
 }
 
+PassRefPtr<BitmapImage> BitmapImage::createWithOrientationForTesting(PassRefPtr<NativeImageSkia> nativeImage, ImageOrientation orientation)
+{
+    RefPtr<BitmapImage> result = create(nativeImage);
+    result->m_frames[0].m_orientation = orientation;
+    if (orientation.usesWidthAsHeight())
+        result->m_sizeRespectingOrientation = IntSize(result->m_size.height(), result->m_size.width());
+    return result.release();
+}
+
 BitmapImage::BitmapImage(ImageObserver* observer)
     : Image(observer)
     , m_currentFrame(0)