Added fastbuild config variable to isolate.gypi to let isolates test it.

Also added chrome_child.dll.pdb to telemetry_gpu_test isolate. This is
in order to get better stack traces for debugging Issue 383963.

BUG=385976,383963
NOTRY=true

Review URL: https://codereview.chromium.org/409113005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284760 0039d316-1c4b-4281-b951-d872f2087c98

build/isolate.gypi

@@ -93,6 +93,7 @@
         '--config-variable', 'CONFIGURATION_NAME=<(CONFIGURATION_NAME)',
         '--config-variable', 'chromeos=<(chromeos)',
         '--config-variable', 'component=<(component)',
+        '--config-variable', 'fastbuild=<(fastbuild)',
         # TODO(kbr): move this to chrome_tests.gypi:gles2_conform_tests_run
         # once support for user-defined config variables is added.
         '--config-variable',

chrome/telemetry_gpu_test.isolate

@@ -24,5 +24,13 @@
         ],
       },
     }],
+    # For debugging crbug.com/383963
+    ['OS=="win" and (fastbuild==0 or fastbuild==1)', {
+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/chrome_child.dll.pdb',
+        ],
+      },
+    }],
   ]
 }