Add script which gathers JSON output from a Swarming task's shards.

testing/buildbot/chromium.gpu.fyi.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See generate_buildbot_json.py to make changes": {},
   "Android Release (Nexus 5)": {
     "gtest_tests": [
       {
         "override_isolate_target": "angle_unittests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
@@ skipping 2888 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 390 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 390 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 424 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc --use-gl=angle",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_angle_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "gpu": "10de:104a",
               "os": "Linux"
             }
           ],
           "shards": 12
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 390 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc --use-gl=angle",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_angle_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 1094 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 373 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 757 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 759 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 82 matching lines @@
     ],
     "isolated_scripts": [
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 43 matching lines @@
     ],
     "isolated_scripts": [
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 45 matching lines @@
     ],
     "isolated_scripts": [
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 46 matching lines @@
     ],
     "isolated_scripts": [
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 81 matching lines @@
     ],
     "isolated_scripts": [
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 130 matching lines @@
     ],
     "isolated_scripts": [
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 1692 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 427 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 427 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 497 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 450 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 895 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release_x64",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 891 matching lines @@
         }
       },
       {
         "args": [
           "webgl_conformance",
           "--show-stdout",
           "--browser=release",
           "-v",
           "--extra-browser-args=--enable-logging=stderr --js-flags=--expose-gc",
           "--webgl-conformance-version=2.0.0",
-          "--webgl2-only=true"
+          "--webgl2-only=true",
+          "--read-abbreviated-json-results-from=../../content/test/data/gpu/webgl2_conformance_tests_output.json"
         ],
         "isolate_name": "telemetry_gpu_integration_test",
         "name": "webgl2_conformance_tests",
         "override_compile_targets": [
           "telemetry_gpu_integration_test_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 69 matching lines @@
             {
               "gpu": "10de:104a",
               "os": "Windows-2012ServerR2-SP0"
             }
           ]
         }
       }
     ]
   }
 }