Extra cookie params (#371)

* Added missing specs for `Ferrum::Cookies::Cookie`.

* Added additional cookie params to `Ferrum::Cookies::Cookie`.

* Chrome Devtools Protocol 1.3 includes additional new params for
  cookies.

lib/ferrum/cookies/cookie.rb

@@ -113,6 +113,38 @@ def expires
         Time.at(attributes["expires"]) if attributes["expires"].positive?
       end
 
+      #
+      # The priority of the cookie.
+      #
+      # @return [String]
+      #
+      def priority
+        @attributes['priority']
+      end
+
+      #
+      # @return [Boolean]
+      #
+      def sameparty?
+        @attributes['sameParty']
+      end
+
+      alias same_party? sameparty?
+
+      #
+      # @return [String]
+      #
+      def source_scheme
+        @attributes['sourceScheme']
+      end
+
+      #
+      # @return [Integer]
+      #
+      def source_port
+        @attributes['sourcePort']
+      end
+
       #
       # Compares different cookie objects.
       #

spec/cookies/cookie_spec.rb

@@ -83,6 +83,30 @@
     end
   end
 
+  describe "#priority" do
+    it "must return the 'priority' attribute" do
+      expect(subject.priority).to eq(attributes['priority'])
+    end
+  end
+
+  describe "#sameparty?" do
+    it "must return the 'sameParty' attribute" do
+      expect(subject.sameparty?).to eq(attributes['sameParty'])
+    end
+  end
+
+  describe "#source_scheme" do
+    it "must return the 'sourceScheme' attribute" do
+      expect(subject.source_scheme).to eq(attributes['sourceScheme'])
+    end
+  end
+
+  describe "#source_port" do
+    it "must return the 'sourcePort' attribute" do
+      expect(subject.source_port).to eq(attributes['sourcePort'])
+    end
+  end
+
   describe "#==" do
     context "when given a #{described_class}" do
       context "and the other #{described_class}'s attributes are the same" do