(Re-land) Switch GPU FYI bots to new Telemetry GPU isolate.

scripts/slave/recipe_modules/gpu/api.py

Index: scripts/slave/recipe_modules/gpu/api.py
diff --git a/scripts/slave/recipe_modules/gpu/api.py b/scripts/slave/recipe_modules/gpu/api.py
index b9ff5c5594b6fc0ffa86979db22c58298ee6b455..d59f12251d7aa8d75e61c736dabcb320dd8e3416 100644
--- a/scripts/slave/recipe_modules/gpu/api.py
+++ b/scripts/slave/recipe_modules/gpu/api.py
@@ -600,9 +600,30 @@ class GpuApi(recipe_api.RecipeApi):
       extra_browser_args_string += ' ' + ' '.join(extra_browser_args)
     test_args.append(extra_browser_args_string)
 
-    return self.m.chromium_tests.steps.TelemetryGPUTest(
-        name, chrome_revision, webkit_revision, args=test_args,
-        target_name=target_name, enable_swarming=enable_swarming,
-        swarming_dimensions=swarming_dimensions,
-        master_class_name=self._master_class_name_for_testing,
-        swarming_extra_suffix=self._get_gpu_suffix(swarming_dimensions))
+    # Run the new Telemetry GPU test isolate on the FYI waterfall.
+    # Once it's running well on all platforms, the old isolate, and
+    # the code which launches it, will be removed.
+    if self.is_fyi_waterfall:
+      # The step name must end in 'test' or 'tests' in order for the
+      # results to automatically show up on the flakiness dashboard.
+      # (At least, this was true some time ago.) Continue to use this
+      # naming convention for the time being to minimize changes.
+      step_name = name
+      if not (step_name.endswith('test') or step_name.endswith('tests')):
+        step_name = '%s_tests' % step_name
+      # Prepend Telemetry GPU-specific flags.
+      benchmark_name = target_name or name
+      prefix_args = [
+        benchmark_name, '--show-stdout',
+        '--browser=%s' % self.m.chromium.c.build_config_fs.lower() ]
+      return self.m.chromium_tests.steps.LocalIsolatedScriptTest(
+          step_name, args=prefix_args + test_args,
+          target_name='telemetry_gpu_new_test',
+          override_compile_targets=['telemetry_gpu_new_test_run'])
+    else:
+      return self.m.chromium_tests.steps.TelemetryGPUTest(
+          name, chrome_revision, webkit_revision, args=test_args,
+          target_name=target_name, enable_swarming=enable_swarming,
+          swarming_dimensions=swarming_dimensions,
+          master_class_name=self._master_class_name_for_testing,
+          swarming_extra_suffix=self._get_gpu_suffix(swarming_dimensions))