feat(@angular/cli): add flags to the process title

Closes #8772
Fixes #6888

Special thanks to @tomastrajan for original PR.

Author: hansl

packages/angular/cli/bin/ng

@@ -3,8 +3,14 @@
 
 // Provide a title to the process in `ps`.
 // Due to an obscure Mac bug, do not start this title with any symbol.
-process.title = 'ng';
+try {
+  process.title = 'ng ' + Array.from(process.argv).slice(2).join(' ');
+} catch(_) {
+  // If an error happened above, use the most basic title.
+  process.title = 'ng';
+}
 
+// Some older versions of Node do not support let or const.
 var version = process.version.substr(1).split('.');
 if (Number(version[0]) < 8 || (Number(version[0]) === 8 && Number(version[1]) < 9)) {
   process.stderr.write(

tests/legacy-cli/e2e/tests/misc/title.ts

@@ -0,0 +1,16 @@
+import {exec, execAndWaitForOutputToMatch, killAllProcesses} from '../../utils/process';
+
+
+export default async function() {
+  try {
+    await execAndWaitForOutputToMatch('ng', ['build', '--watch'], /./);
+
+    const output = await exec('ps');
+
+    if (!output.stdout.match(/ng build --watch/)) {
+      throw new Error('Title of the process was not properly set.');
+    }
+  } finally {
+    await killAllProcesses();
+  }
+}