Removing unnecessary assert from BitmapImage::draw

Source/platform/graphics/GraphicsContext.cpp

Index: Source/platform/graphics/GraphicsContext.cpp
diff --git a/Source/platform/graphics/GraphicsContext.cpp b/Source/platform/graphics/GraphicsContext.cpp
index ce53c4b73bc776681c6627ebb628f3f2006ee3f3..d2f41647533837dbd573d1027bb73a862f346a9a 100644
--- a/Source/platform/graphics/GraphicsContext.cpp
+++ b/Source/platform/graphics/GraphicsContext.cpp
@@ -932,6 +932,20 @@ void GraphicsContext::drawImage(Image* image, const IntRect& r, SkXfermode::Mode
     drawImage(image, FloatRect(r), FloatRect(FloatPoint(), FloatSize(image->size())), op, shouldRespectImageOrientation);
 }
 
+static FloatRect adjustRectForNegativeSize(const FloatRect& rect)
+{
+    FloatRect norm = rect;
+    if (norm.width() < 0) {
+        norm.setX(norm.x() + norm.width());
+        norm.setWidth(-norm.width());
+    }
+    if (norm.height() < 0) {
+        norm.setY(norm.y() + norm.height());
+        norm.setHeight(-norm.height());
+    }
+    return norm;
+}
+
 void GraphicsContext::drawImage(Image* image, const FloatRect& dest, const FloatRect& src, SkXfermode::Mode op, RespectImageOrientationEnum shouldRespectImageOrientation)
 {
     if (contextDisabled() || !image)
@@ -946,7 +960,9 @@ void GraphicsContext::drawImage(Image* image, const FloatRect& dest, const Float
     // regardless of whether content is pixel aligned. Is this correct?
     // For now, just preserving legacy behavior.
     imagePaint.setAntiAlias(shouldAntialiasImages());
-    image->draw(m_canvas, imagePaint, dest, src, shouldRespectImageOrientation, Image::ClampImageToSourceRect);

[chrishtr, 2015/06/12 16:45:12]

Why is the rect of negative width or height? Can it be fixed earlier in the call
stack?

+    FloatRect normDest = adjustRectForNegativeSize(dest);
+    FloatRect normSrc = adjustRectForNegativeSize(src);
+    image->draw(m_canvas, imagePaint, normDest, normSrc, shouldRespectImageOrientation, Image::ClampImageToSourceRect);
 }
 
 SkFilterQuality GraphicsContext::computeFilterQuality(Image* image, const FloatRect& dest, const FloatRect& src) const