Use SkJpegEncoder in WebKit platform

third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h

Index: third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h
diff --git a/third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h b/third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h
index 93b6db0ed310969cf73d21617e8c7a3e4bb87678..db84ecbf0a4e343f75558dc19e6fd26f06e578ce 100644
--- a/third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h
+++ b/third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h
@@ -143,6 +143,25 @@ inline PaintCanvas::SrcRectConstraint WebCoreClampingModeToSkiaRectConstraint(
              : PaintCanvas::kFast_SrcRectConstraint;
 }
 
+class VectorWStream : public SkWStream {
+ public:
+  VectorWStream(Vector<unsigned char>* dst) : dst_(dst) {
+    DCHECK(dst_);
+    DCHECK_EQ(0UL, dst->size());
+  }
+
+  bool write(const void* buffer, size_t size) override {
+    dst_->Append((const unsigned char*)buffer, size);
+    return true;
+  }
+
+  size_t bytesWritten() const override { return dst_->size(); }
+
+ private:
+  // Does not own
+  Vector<unsigned char>* dst_;
+};
+
 // Skia's smart pointer APIs are preferable over their legacy raw pointer
 // counterparts.
 //