DevTools: enable backwards-compatibility testing

third_party/WebKit/Source/devtools/scripts/npm_test.js

Index: third_party/WebKit/Source/devtools/scripts/npm_test.js
diff --git a/third_party/WebKit/Source/devtools/scripts/npm_test.js b/third_party/WebKit/Source/devtools/scripts/npm_test.js
index 37a93acd4e29e00dbf17c33c56179b5d49b11565..08bbdc61405f45a940f5c9755e8cee6bd5e8693a 100644
--- a/third_party/WebKit/Source/devtools/scripts/npm_test.js
+++ b/third_party/WebKit/Source/devtools/scripts/npm_test.js
@@ -13,10 +13,16 @@ var Flags = {
     DEBUG_DEVTOOLS: "--debug-devtools",
     DEBUG_DEVTOOLS_SHORTHAND: "-d",
     FETCH_CONTENT_SHELL: "--fetch-content-shell",
+    COMPAT_PROTOCOL: "--compat-protocol",
+};
+
+var COMPAT_URL_MAPPING = {
+    "1.2": "https://storage.googleapis.com/content-shell-devtools-compat/content_shell_417361.zip",
 };
 
 var IS_DEBUG_ENABLED = utils.includes(process.argv, Flags.DEBUG_DEVTOOLS) ||
     utils.includes(process.argv, Flags.DEBUG_DEVTOOLS_SHORTHAND);
+var COMPAT_PROTOCOL = utils.parseArgs(process.argv)[Flags.COMPAT_PROTOCOL];
 var IS_FETCH_CONTENT_SHELL = utils.includes(process.argv, Flags.FETCH_CONTENT_SHELL);
 
 var CONTENT_SHELL_ZIP = "content-shell.zip";
@@ -31,6 +37,14 @@ var CACHE_PATH = path.resolve(__dirname, "..", ".test_cache");
 var SOURCE_PATH = path.resolve(__dirname, "..", "front_end");
 
 function main(){
+    if (!utils.isDir(CACHE_PATH))
+        fs.mkdirSync(CACHE_PATH);
+    deleteOldContentShells();
+
+    if (COMPAT_PROTOCOL) {
+        runCompatibilityTests();
+        return;
+    }
     var hasUserCompiledContentShell = utils.isFile(getContentShellBinaryPath(RELEASE_PATH));
     if (!IS_FETCH_CONTENT_SHELL && hasUserCompiledContentShell) {
         var outDir = path.resolve(RELEASE_PATH, "..");
@@ -40,9 +54,7 @@ function main(){
         runTests(outDir, IS_DEBUG_ENABLED);
         return;
     }
-    if (!utils.isDir(CACHE_PATH))
-        fs.mkdirSync(CACHE_PATH);
-    deleteOldContentShells();
+
     findPreviousUploadedPosition(findMostRecentChromiumCommit())
         .then(onUploadedCommitPosition)
         .catch(onError);
@@ -54,6 +66,26 @@ function main(){
 }
 main();
 
+function runCompatibilityTests()
+{
+    const folder = `compat-protocol-${COMPAT_PROTOCOL}`;
+    compileFrontend();
+    var outPath = path.resolve(CACHE_PATH, folder, "out");
+    var contentShellDirPath = path.resolve(outPath, "Release");
+    var hasCachedContentShell = utils.isFile(getContentShellBinaryPath(contentShellDirPath));
+    if (hasCachedContentShell) {
+        console.log(`Using cached content shell at: ${outPath}`);
+        copyFrontendToCompatBuildPath(contentShellDirPath, RELEASE_PATH);
+        runTests(outPath, IS_DEBUG_ENABLED);
+        return;
+    }
+    prepareContentShellDirectory(folder)
+        .then(() => downloadContentShell(COMPAT_URL_MAPPING[COMPAT_PROTOCOL], folder))
+        .then(extractContentShell)
+        .then(() => copyFrontendToCompatBuildPath(contentShellDirPath, RELEASE_PATH))
+        .then(() => runTests(outPath, IS_DEBUG_ENABLED));
+}
+
 function compileFrontend()
 {
     console.log("Compiling devtools frontend");
@@ -78,13 +110,24 @@ function onUploadedCommitPosition(commitPosition)
         copyFrontend(contentShellResourcesPath);
         return runTests(contentShellPath, true);
     }
+    var url = `http://commondatastorage.googleapis.com/chromium-browser-snapshots/${PLATFORM}/${commitPosition}/${CONTENT_SHELL_ZIP}`;
     return prepareContentShellDirectory(commitPosition)
-        .then(downloadContentShell)
+        .then(() => downloadContentShell(url, commitPosition))
         .then(extractContentShell)
         .then(() => copyFrontend(contentShellResourcesPath))
         .then(() => runTests(contentShellPath, true));
 }
 
+function copyFrontendToCompatBuildPath(compatBuildPath, latestBuildPath)
+{
+    var customDevtoolsResourcesPath = path.resolve(compatBuildPath, "resources");
+    var latestDevtoolsInspectorPath  = path.resolve(latestBuildPath, "resources", "inspector");
+    var copiedFrontendPath = path.resolve(customDevtoolsResourcesPath, "inspector");
+    if (utils.isDir(copiedFrontendPath))
+        utils.removeRecursive(copiedFrontendPath);
+    utils.copyRecursive(latestDevtoolsInspectorPath, customDevtoolsResourcesPath);
+}
+
 function copyFrontend(contentShellResourcesPath)
 {
     var devtoolsResourcesPath = path.resolve(contentShellResourcesPath, "inspector");
@@ -170,18 +213,17 @@ function findPreviousUploadedPosition(commitPosition)
     }
 }
 
-function prepareContentShellDirectory(contentShellCommitPosition)
+function prepareContentShellDirectory(folder)
 {
-    var contentShellPath = path.join(CACHE_PATH, contentShellCommitPosition);
+    var contentShellPath = path.join(CACHE_PATH, folder);
     if (utils.isDir(contentShellPath))
         utils.removeRecursive(contentShellPath);
     fs.mkdirSync(contentShellPath);
-    return Promise.resolve(contentShellCommitPosition);
+    return Promise.resolve(folder);
 }
 
-function downloadContentShell(commitPosition)
+function downloadContentShell(url, folder)
 {
-    var url = `http://commondatastorage.googleapis.com/chromium-browser-snapshots/${PLATFORM}/${commitPosition}/${CONTENT_SHELL_ZIP}`;
     console.log("Downloading content shell from:", url);
     console.log("NOTE: Download is ~35-65 MB depending on OS");
     return utils.fetch(url)
@@ -191,7 +233,7 @@ function downloadContentShell(commitPosition)
     function writeZip(buffer)
     {
         console.log("Completed download of content shell");
-        var contentShellZipPath = path.join(CACHE_PATH, commitPosition, CONTENT_SHELL_ZIP);
+        var contentShellZipPath = path.join(CACHE_PATH, folder, CONTENT_SHELL_ZIP);
         fs.writeFileSync(contentShellZipPath, buffer);
         return contentShellZipPath;
     }
@@ -247,6 +289,9 @@ function runTests(buildDirectoryPath, useDebugDevtools)
     } else {
         console.log("TIP: You can debug a test using: npm run debug-test inspector/test-name.html")
     }
+    if (COMPAT_PROTOCOL) {
+        testArgs.push(`--platform=linux-devtools-${COMPAT_PROTOCOL}`);
+    }
     if (IS_DEBUG_ENABLED) {
         testArgs.push("--additional-driver-flag=--remote-debugging-port=9222");
         testArgs.push("--time-out-ms=6000000");
@@ -265,7 +310,10 @@ function getTestFlags()
     var flagValues = Object.keys(Flags).map(key => Flags[key]);
     return process.argv
         .slice(2)
-        .filter(arg => !utils.includes(flagValues, arg) && !utils.includes(arg, "inspector"));
+        .filter(arg => {
+            var flagName = utils.includes(arg, "=") ? arg.slice(0, arg.indexOf('=')) : arg;
+            return !utils.includes(flagValues, flagName) && !utils.includes(arg, "inspector")
+        });
 }
 
 function getInspectorTests()