Update example vscode tasks

- Try to make the tasks more general purpose.
  * Add mechanism to switch output directories. Most
    tasks will work with this value.
  * Add tasks to run tests for the current file or directory
    instead of pre-determined targets.
- Try to simplify it.
  * Remove some parameters which are defaults
  * Move pattern matches to top-level, to avoid duplicates.

Change-Id: Ifff15bc264be510c0859e4adcce7b996349ac343
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402189Reviewed-by: Chase Phillips <cmp@chromium.org>
Commit-Queue: Chase Phillips <cmp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805872}

docs/vscode.md

@@ -259,12 +259,12 @@ in the Explorer tab) is chromium/src. If this is not the case, replace any
 references to ${workspaceFolder} with the path to chromium/src.
 
 ### Tasks
-Next, we'll tell VS Code how to compile our code and how to read warnings and
-errors from the build output. Open the file
-[//tools/vscode/tasks.json5](/tools/vscode/tasks.json5). This will provide 5
-tasks to do basic things. You might have to adjust the commands to your
-situation and needs. To use these settings wholesale, enter the following
-command into your terminal:
+Next, we'll tell VS Code how to compile our code, run tests, and to read
+warnings and errors from the build output. Open the file
+[//tools/vscode/tasks.json5](/tools/vscode/tasks.json5). This will provide tasks
+to do basic things. You might have to adjust the commands to your situation and
+needs. To use these settings wholesale, enter the following command into your
+terminal:
 ```
 $ cp tools/vscode/tasks.json5 .vscode/tasks.json
 ```

tools/vscode/launch.json5

@@ -8,7 +8,7 @@
       "targetArchitecture": "x64",
       "program": "${workspaceRoot}/out/Debug/chrome",
       "args": [], // Optional command line args
-      "preLaunchTask": "1-build_chrome_debug",
+      "preLaunchTask": "6-build_chrome_debug",
       "stopAtEntry": false,
       "cwd": "${workspaceRoot}/out/Debug/",
       "environment": [],
@@ -35,7 +35,7 @@
       "targetArchitecture": "x64",
       "program": "${workspaceRoot}/out/Release/chrome",
       "args": [], // Optional command line args
-      "preLaunchTask": "2-build_chrome_release",
+      "preLaunchTask": "7-build_chrome_release",
       "stopAtEntry": false,
       "cwd": "${workspaceRoot}/out/Release/",
       "environment": [],
@@ -53,7 +53,7 @@
         "--ui-test-action-max-timeout=1000000",
         "--test-launcher-timeout=1000000"
       ],
-      "preLaunchTask": "5-build_test_debug",
+      "preLaunchTask": "8-build_test_debug",
       "stopAtEntry": false,
       "cwd": "${workspaceRoot}/out/Debug/",
       "environment": [],