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diff --git a/chromium/third_party/skia/gm/gm_json.py b/chromium/third_party/skia/gm/gm_json.py
new file mode 100644
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+++ b/chromium/third_party/skia/gm/gm_json.py
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+#!/usr/bin/env python
+# Copyright (c) 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.
+
+"""Schema of the JSON summary file written out by the GM tool.
+
+This must be kept in sync with the kJsonKey_ constants in gm_expectations.cpp !
+"""
+
+__author__ = 'Elliot Poger'
+
+
+# system-level imports
+import io
+import json
+import os
+import posixpath
+import re
+
+
+# Key strings used in GM results JSON files (both expected-results.json and
+# actual-results.json).
+#
+# NOTE: These constants must be kept in sync with the kJsonKey_ constants in
+# gm_expectations.cpp and tools/PictureRenderer.cpp !
+# Eric suggests: create gm/gm_expectations_constants.h containing ONLY variable
+# declarations so as to be readable by both gm/gm_expectations.cpp and Python.
+
+
+JSONKEY_ACTUALRESULTS = 'actual-results'
+
+# Tests whose results failed to match expectations.
+JSONKEY_ACTUALRESULTS_FAILED = 'failed'
+
+# Tests whose results failed to match expectations, but IGNOREFAILURE causes
+# us to take them less seriously.
+JSONKEY_ACTUALRESULTS_FAILUREIGNORED = 'failure-ignored'
+
+# Tests for which we do not have any expectations.  They may be new tests that
+# we haven't had a chance to check in expectations for yet, or we may have
+# consciously decided to leave them without expectations because we are unhappy
+# with the results (although we should try to move away from that, and instead
+# check in expectations with the IGNOREFAILURE flag set).
+JSONKEY_ACTUALRESULTS_NOCOMPARISON = 'no-comparison'
+
+# Tests whose results matched their expectations.
+JSONKEY_ACTUALRESULTS_SUCCEEDED = 'succeeded'
+
+
+JSONKEY_EXPECTEDRESULTS = 'expected-results'
+
+# One or more [HashType/DigestValue] pairs representing valid results for this
+# test.  Typically, there will just be one pair, but we allow for multiple
+# expectations, and the test will pass if any one of them is matched.
+JSONKEY_EXPECTEDRESULTS_ALLOWEDDIGESTS = 'allowed-digests'
+
+# Optional: one or more integers listing Skia bugs (under
+# https://code.google.com/p/skia/issues/list ) that pertain to this expectation.
+JSONKEY_EXPECTEDRESULTS_BUGS = 'bugs'
+
+# If IGNOREFAILURE is set to True, a failure of this test will be reported
+# within the FAILUREIGNORED section (thus NOT causing the buildbots to go red)
+# rather than the FAILED section (which WOULD cause the buildbots to go red).
+JSONKEY_EXPECTEDRESULTS_IGNOREFAILURE = 'ignore-failure'
+
+# Optional: a free-form text string with human-readable information about
+# this expectation.
+JSONKEY_EXPECTEDRESULTS_NOTES = 'notes'
+
+# Optional: boolean indicating whether this expectation was reviewed/approved
+# by a human being.
+# If True: a human looked at this image and approved it.
+# If False: this expectation was committed blind.  (In such a case, please
+#   add notes indicating why!)
+# If absent: this expectation was committed by a tool that didn't enforce human
+#   review of expectations.
+JSONKEY_EXPECTEDRESULTS_REVIEWED = 'reviewed-by-human'
+
+# Allowed hash types for test expectations.
+JSONKEY_HASHTYPE_BITMAP_64BITMD5 = 'bitmap-64bitMD5'
+
+JSONKEY_HEADER = 'header'
+JSONKEY_HEADER_TYPE = 'type'
+JSONKEY_HEADER_REVISION = 'revision'
+JSONKEY_IMAGE_CHECKSUMALGORITHM = 'checksumAlgorithm'
+JSONKEY_IMAGE_CHECKSUMVALUE = 'checksumValue'
+JSONKEY_IMAGE_COMPARISONRESULT = 'comparisonResult'
+JSONKEY_IMAGE_FILEPATH = 'filepath'
+JSONKEY_SOURCE_TILEDIMAGES = 'tiled-images'
+JSONKEY_SOURCE_WHOLEIMAGE = 'whole-image'
+
+
+# Root directory where the buildbots store their actually-generated images...
+#  as a publicly readable HTTP URL:
+GM_ACTUALS_ROOT_HTTP_URL = (
+    'http://chromium-skia-gm.commondatastorage.googleapis.com/gm')
+#  as a GS URL that allows credential-protected write access:
+GM_ACTUALS_ROOT_GS_URL = 'gs://chromium-skia-gm/gm'
+
+# Root directory where buildbots store skimage actual results json files.
+SKIMAGE_ACTUALS_BASE_URL = (
+    'http://chromium-skia-gm.commondatastorage.googleapis.com/skimage/actuals')
+# Root directory inside trunk where skimage expectations are stored.
+SKIMAGE_EXPECTATIONS_ROOT = os.path.join('expectations', 'skimage')
+
+# Pattern used to assemble each image's filename
+IMAGE_FILENAME_PATTERN = '(.+)_(.+)\.png'  # matches (testname, config)
+
+# Pattern used to create image URLs, relative to some base URL.
+GM_RELATIVE_URL_FORMATTER = '%s/%s/%s.png' # pass in (hash_type, test_name,
+                                           #          hash_digest)
+GM_RELATIVE_URL_PATTERN = '(.+)/(.+)/(.+).png' # matches (hash_type, test_name,
+                                               #          hash_digest)
+GM_RELATIVE_URL_RE = re.compile(GM_RELATIVE_URL_PATTERN)
+
+
+def CreateGmActualUrl(test_name, hash_type, hash_digest,
+                      gm_actuals_root_url=GM_ACTUALS_ROOT_HTTP_URL):
+  """Return the URL we can use to download a particular version of
+  the actually-generated image for this particular GM test.
+
+  test_name: name of the test, e.g. 'perlinnoise'
+  hash_type: string indicating the hash type used to generate hash_digest,
+             e.g. JSONKEY_HASHTYPE_BITMAP_64BITMD5
+  hash_digest: the hash digest of the image to retrieve
+  gm_actuals_root_url: root url where actual images are stored
+  """
+  return posixpath.join(
+      gm_actuals_root_url, CreateGmRelativeUrl(
+          test_name=test_name, hash_type=hash_type, hash_digest=hash_digest))
+
+
+def CreateGmRelativeUrl(test_name, hash_type, hash_digest):
+  """Returns a relative URL pointing at a test result's image.
+
+  Returns the URL we can use to download a particular version of
+  the actually-generated image for this particular GM test,
+  relative to the URL root.
+
+  Args:
+    test_name: name of the test, e.g. 'perlinnoise'
+    hash_type: string indicating the hash type used to generate hash_digest,
+               e.g. JSONKEY_HASHTYPE_BITMAP_64BITMD5
+    hash_digest: the hash digest of the image to retrieve
+  """
+  return GM_RELATIVE_URL_FORMATTER % (hash_type, test_name, hash_digest)
+
+
+def SplitGmRelativeUrl(url):
+  """Splits the relative URL into (test_name, hash_type, hash_digest) tuple.
+
+  This is the inverse of CreateGmRelativeUrl().
+
+  Args:
+    url: a URL generated with CreateGmRelativeUrl().
+
+  Returns: (test_name, hash_type, hash_digest) tuple.
+  """
+  hash_type, test_name, hash_digest = GM_RELATIVE_URL_RE.match(url).groups()
+  return (test_name, hash_type, hash_digest)
+
+
+def LoadFromString(file_contents):
+  """Loads the JSON summary written out by the GM tool.
+     Returns a dictionary keyed by the values listed as JSONKEY_ constants
+     above."""
+  # TODO(epoger): we should add a version number to the JSON file to ensure
+  # that the writer and reader agree on the schema (raising an exception
+  # otherwise).
+  json_dict = json.loads(file_contents)
+  return json_dict
+
+
+def LoadFromFile(file_path):
+  """Loads the JSON summary written out by the GM tool.
+     Returns a dictionary keyed by the values listed as JSONKEY_ constants
+     above."""
+  file_contents = open(file_path, 'r').read()
+  return LoadFromString(file_contents)
+
+
+def WriteToFile(json_dict, file_path):
+  """Writes the JSON summary in json_dict out to file_path.
+
+  The file is written Unix-style (each line ends with just LF, not CRLF);
+  see https://code.google.com/p/skia/issues/detail?id=1815 for reasons."""
+  with io.open(file_path, mode='w', newline='', encoding='utf-8') as outfile:
+    outfile.write(unicode(json.dumps(json_dict, outfile, sort_keys=True,
+                                     indent=2)))