Added isolates for remaining tests on GPU bots.

chrome/content_gl_tests.isolate

+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+{
+  # TODO(kbr): including all of chrome.isolate is overkill -- the only
+  # real dependency is on ffmpegsumo. However, wait to refactor
+  # chrome.isolate (perhaps adding a media.isolate) for the moment.
+  'includes': [
+    'chrome.isolate',
+  ],
+  'conditions': [
+    ['OS=="android" or OS=="linux" or OS=="mac" or OS=="win"', {
+      'variables': {
+        'command': [
+          '<(PRODUCT_DIR)/content_gl_tests<(EXECUTABLE_SUFFIX)',
+        ],
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/content_gl_tests<(EXECUTABLE_SUFFIX)',
+        ],
+      },
+    }],
+  ],
+}