[dom_distiller] Add support for incremental viewer.

components/dom_distiller/content/dom_distiller_viewer_source_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/dom_distiller/content/dom_distiller_viewer_source.h"
 
 #include "components/dom_distiller/core/url_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace dom_distiller {
 
 const char kTestScheme[] = "myscheme";
 
 class DomDistillerViewerSourceTest : public testing::Test {
  public:
   virtual void SetUp() OVERRIDE {
     source_.reset(new DomDistillerViewerSource(NULL, kTestScheme));
   }
 
  protected:
   scoped_ptr<DomDistillerViewerSource> source_;
 };
 
 TEST_F(DomDistillerViewerSourceTest, TestMimeType) {
-  EXPECT_EQ("text/css", source_.get()->GetMimeType(kCssPath));
+  EXPECT_EQ("text/css", source_.get()->GetMimeType(kViewerCssPath));
   EXPECT_EQ("text/html", source_.get()->GetMimeType("anythingelse"));
+  EXPECT_EQ("text/javascript", source_.get()->GetMimeType(kViewerJsPath));
+
 }
 
 }  // namespace dom_distiller