DevTools: [Audits] Add test for ViewportDimensions artifact

Bug: 1004875
Change-Id: I3fc4cc0d6fdaaa366bfb20b95ab7d79049b3c21f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809102
Commit-Queue: Paul Irish <paulirish@chromium.org>
Reviewed-by: Paul Irish <paulirish@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697695}

third_party/blink/web_tests/http/tests/devtools/audits/audits-emulate-run-expected.txt

@@ -14,6 +14,13 @@ Run audits: enabled visible
 URL: http://127.0.0.1:8000/devtools/audits/resources/audits-emulate-pass.html
 Version: 5.2.0
 TestedAsMobileDevice: true
+ViewportDimensions: {
+  "innerWidth": 412,
+  "innerHeight": 660,
+  "outerWidth": 412,
+  "outerHeight": 660,
+  "devicePixelRatio": 2.625
+}
 
 
 content-width: pass 

third_party/blink/web_tests/http/tests/devtools/audits/audits-emulate-run.js

@@ -17,6 +17,7 @@
   TestRunner.addResult(`URL: ${lhr.finalUrl}`);
   TestRunner.addResult(`Version: ${lhr.lighthouseVersion}`);
   TestRunner.addResult(`TestedAsMobileDevice: ${artifacts.TestedAsMobileDevice}`);
+  TestRunner.addResult(`ViewportDimensions: ${JSON.stringify(artifacts.ViewportDimensions, null, 2)}`);
   TestRunner.addResult('\n');
 
   const auditName = 'content-width';

third_party/blink/web_tests/http/tests/devtools/audits/audits-successful-run-expected.txt

@@ -284,6 +284,13 @@ Generating results...
 URL: http://127.0.0.1:8000/devtools/resources/inspected-page.html
 Version: 5.2.0
 TestedAsMobileDevice: true
+ViewportDimensions: {
+  "innerWidth": 981,
+  "innerHeight": 1570,
+  "outerWidth": 412,
+  "outerHeight": 660,
+  "devicePixelRatio": 2.625
+}
 
 
 accesskeys: notApplicable

third_party/blink/web_tests/http/tests/devtools/audits/audits-successful-run.js

@@ -50,6 +50,7 @@
   TestRunner.addResult(`URL: ${lhr.finalUrl}`);
   TestRunner.addResult(`Version: ${lhr.lighthouseVersion}`);
   TestRunner.addResult(`TestedAsMobileDevice: ${artifacts.TestedAsMobileDevice}`);
+  TestRunner.addResult(`ViewportDimensions: ${JSON.stringify(artifacts.ViewportDimensions, null, 2)}`);
   TestRunner.addResult('\n');
 
   Object.keys(lhr.audits).sort().forEach(auditName => {