Re-land: Switch GPU pixel tests to use cloud storage instead of the local disk.

scripts/slave/recipes/gpu/build_and_test.expected/linux_debug_tryserver.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "config",
       "--spec",
       "cache_dir = None\nsolutions = [{'custom_deps': {'src/third_party/WebKit/LayoutTests': None, 'src/webkit/data/layout_tests/LayoutTests': None}, 'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}, {'custom_deps': {'src/chrome/test/data/firefox2_profile/searchplugins': None, 'src/chrome/test/data/firefox2_searchplugins': None, 'src/chrome/test/data/firefox3_profile/searchplugins': None, 'src/chrome/test/data/firefox3_searchplugins': None, 'src/chrome/test/data/osdd': None, 'src/chrome/test/data/plugin': None, 'src/chrome/test/data/ssl/certs': None, 'src/data/autodiscovery': None, 'src/data/esctf': None, 'src/data/mach_ports': None, 'src/data/memory_test': None, 'src/data/mozilla_js_tests': None, 'src/data/page_cycler': None, 'src/data/selenium_core': None, 'src/data/tab_switching': None, 'src/tools/grit/grit/test/data': None, 'src/webkit/data/bmp_decoder': None, 'src/webkit/data/ico_decoder': None, 'src/webkit/data/test_shell/plugins': None, 'src/webkit/data/xbm_decoder': None}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src-internal', 'url': 'svn://svn-mirror.golo.chromium.org/chrome-internal/trunk/src-internal'}]"
     ],
@@ skipping 249 matching lines @@
       "--results-directory=[SLAVE_BUILD]/gtest-results/pixel_test",
       "--build-number=571",
       "--builder-name=TestBuilder",
       "--run-python-script",
       "[SLAVE_BUILD]/src/content/test/gpu/run_gpu_test",
       "pixel_test",
       "--show-stdout",
       "--output-format=gtest",
       "--browser=debug",
       "-v",
-      "--generated-dir=[SLAVE_BUILD]/content_gpu_data/telemetry/generated",
-      "--reference-dir=[SLAVE_BUILD]/content_gpu_data/telemetry/reference",
-      "--build-revision=170242"
+      "--build-revision",
+      "170242",
+      "--download-refimg-from-cloud-storage",
+      "--refimg-cloud-storage-bucket",
+      "chromium-gpu-archive/reference-images",
+      "--os-type",
+      "linux",
+      "--test-machine-name",
+      "TestBuilder"
     ],
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "pixel_test"
   },
   {
     "always_run": true,
     "cmd": [
       "python",
@@ skipping 180 matching lines @@
       "--output-format=gtest",
       "--browser=debug",
       "-v"
     ],
     "env": {
       "CHROME_DEVEL_SANDBOX": "/opt/chromium/chrome_sandbox"
     },
     "name": "gpu_process_launch_tests"
   }
 ]