Bug 1341763 - stylo: Add support for -moz-image-rect value r=manishearth

MozReview-Commit-ID: CjjX6SI3sWX

--HG--
extra : rebase_source : be56e929d5ed9b0253ae5777ca60e6c73a403222

layout/style/ServoBindings.cpp

@@ -926,6 +926,14 @@ Gecko_CopyImageValueFrom(nsStyleImage* aImage, const nsStyleImage* aOther)
   *aImage = *aOther;
 }
 
+void
+Gecko_InitializeImageCropRect(nsStyleImage* aImage)
+{
+  MOZ_ASSERT(aImage);
+  nsStyleSides cropRect;
+  aImage->SetCropRect(MakeUnique<nsStyleSides>(cropRect));
+}
+
 void
 Gecko_SetCursorArrayLength(nsStyleUserInterface* aStyleUI, size_t aLen)
 {

layout/style/ServoBindings.h

@@ -230,6 +230,7 @@ void Gecko_SetGradientImageValue(nsStyleImage* image, nsStyleGradient* gradient)
 void Gecko_SetUrlImageValue(nsStyleImage* image,
                             ServoBundledURI uri);
 void Gecko_CopyImageValueFrom(nsStyleImage* image, const nsStyleImage* other);
+void Gecko_InitializeImageCropRect(nsStyleImage* image);
 
 nsStyleGradient* Gecko_CreateGradient(uint8_t shape,
                                       uint8_t size,