Add support for cc_perftests and other non-telemetry gtest based tests.

Add support for cc_perftests and other non-telemetry gtest based tests.

This adds a src-side script for running non-telemetry based performance tests.

Will be followed by: https://codereview.chromium.org/873403002/

Example chromium.perf.json:

{
  "Linux Perf (1)": {
    "scripts": [
      {
        "name": "media_perftests",
        "script": "perf_gtests.py",
        "args": ["media_perftests", "--single-process-tests"]
      },
      {
        "name": "load_library_perf_tests",
        "script": "perf_gtests.py",
        "args": ["load_library_perf_tests", "--single-process-tests"]
      }
    ]
  },
  "Android Nexus7v2 Perf": {
    "scripts": [
      {
        "name": "media_perftests",
        "script": "perf_gtests.py",
        "args": ["media_perftests"]
      }
    ]
  }
}

BUG=392620

Review URL: https://codereview.chromium.org/890653002

Cr-Commit-Position: refs/heads/master@{#318109}