Merge 138170

Source/WebCore/platform/image-encoders/skia/WEBPImageEncoder.cpp

Index: Source/WebCore/platform/image-encoders/skia/WEBPImageEncoder.cpp
===================================================================
--- Source/WebCore/platform/image-encoders/skia/WEBPImageEncoder.cpp	(revision 139669)
+++ Source/WebCore/platform/image-encoders/skia/WEBPImageEncoder.cpp	(working copy)
@@ -122,7 +122,7 @@
 {
     SkAutoLockPixels bitmapLock(bitmap);
 
-    if (bitmap.config() != SkBitmap::kARGB_8888_Config)
+    if (bitmap.config() != SkBitmap::kARGB_8888_Config || !bitmap.getPixels())
         return false; // Only support 32 bit/pixel skia bitmaps.
 
     return encodePixels(IntSize(bitmap.width(), bitmap.height()), static_cast<unsigned char *>(bitmap.getPixels()), true, quality, output);