Avoid srcset upscaling for 1x DPR scenarios

Source/core/html/parser/HTMLSrcsetParserTest.cpp

 // 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 "config.h"
 #include "core/html/parser/HTMLSrcsetParser.h"
 
 #include <gtest/gtest.h>
 #include <limits.h>
 
@@ skipping 70 matching lines @@
         {1.0, 400, "", "400.gif 400w, 6000.gif 6000w", "400.gif", 1.0, 400},
         {1.0, 400, "", "400.gif 400pw, 6000.gif 6000w", "6000.gif", 15.0, 6000},
         {1.0, 400, "fallback.gif", "400.gif 400pw", "fallback.gif", 1.0, -1},
         {1.0, 400, "fallback.gif", "400.gif +400w", "fallback.gif", 1.0, -1},
         {1.0, 400, "", "400.gif 400w 400h, 6000.gif 6000w", "400.gif", 1.0, 400},
         {4.0, 400, "", "400.gif 400w, 6000.gif 6000w", "6000.gif", 15.0, 6000},
         {3.8, 400, "", "400.gif 400w, 6000.gif 6000w", "400.gif", 1.0, 400},
         {0.9, 800, "src.gif", "400.gif 400w", "400.gif", 0.5, 400},
         {0.9, 800, "src.gif", "1x.gif 1x, 400.gif 400w", "1x.gif", 1.0, -1},
         {0.9, 800, "src.gif", "1x.gif 0.6x, 400.gif 400w", "1x.gif", 0.6, -1},
+        {0.9, 800, "src.gif", "1x.gif 1x, 400.gif 720w", "400.gif", 0.9, 720},
+        {0.9, 800, "src.gif", "1x.gif 1x, 400.gif 719w", "1x.gif", 1.0, -1},
         {2.0, 800, "src.gif", "400.gif 400w", "400.gif", 0.5, 400},
         {1.0, 400, "src.gif", "800.gif 800w", "800.gif", 2.0, 800},
         {1.0, 400, "src.gif", "0.gif 0w, 800.gif 800w", "800.gif", 2.0, 800},
         {1.0, 400, "src.gif", "0.gif 0w, 2x.gif 2x", "src.gif", 1.0, -1},
         {1.0, 400, "src.gif", "800.gif 2x, 1600.gif 1600w", "800.gif", 2.0, -1},
         {1.0, 400, "", "400.gif 400w, 2x.gif 2x", "400.gif", 1.0, 400},
         {2.0, 400, "", "400.gif 400w, 2x.gif 2x", "2x.gif", 2.0, -1},
         {1.0, 0, "", "400.gif 400w, 6000.gif 6000w", "400.gif", std::numeric_limits<float>::infinity(), 400},
         {2.0, -1, "", ", 1x.gif 1x, 2x.gif 2x", "2x.gif", 2.0, -1},
         {1.0, -1, "", ",1x.gif 1x, 2x.gif 2x", "1x.gif", 1.0, -1},
@@ skipping 16 matching lines @@
     for (unsigned i = 0; testCases[i].srcInput; ++i) {
         TestCase test = testCases[i];
         ImageCandidate candidate = bestFitSourceForImageAttributes(test.deviceScaleFactor, test.effectiveSize, test.srcInput, test.srcsetInput);
         ASSERT_EQ(test.outputDensity, candidate.density());
         ASSERT_EQ(test.outputResourceWidth, candidate.resourceWidth());
         ASSERT_STREQ(test.outputURL, candidate.toString().ascii().data());
     }
 }
 
 } // namespace