Reland "[tools] Add benchmark owners to the config"

This is a reland of 989285b7

Original change's description:
> [tools] Add benchmark owners to the config
>
> R=machenbach@chromium.org
>
> No-Try: true
> Bug: chromium:826280
> Change-Id: Ic34d13170dfecdd9e791974a34c33ba0248c7a38
> Reviewed-on: https://chromium-review.googlesource.com/1053809
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53138}

TBR=machenbach@chromium.org

No-Try: true
Bug: chromium:826280
Change-Id: I169788ff40dd88a7017b46a15b292568b907f38e
Reviewed-on: https://chromium-review.googlesource.com/1061697
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53215}

test/js-perf-test/JSTests.json

 {
+  "owners": ["jarin@chromium.org", "mvstanston@chromium.org"],
   "name": "JSTests",
   "run_count": 3,
   "run_count_arm": 1,

test/js-perf-test/RegExp.json

 {
+  "owners": ["jgruber@chromium.org", "yangguo@chromium.org"],
   "name": "RegExp",
   "run_count": 3,
   "run_count_arm": 1,

test/js-perf-test/SixSpeed.json

 {
+  "owners": ["jarin@chromium.org", "mvstanston@chromium.org"],
   "name": "SixSpeed",
   "run_count": 3,
   "run_count_arm": 1,

test/memory/Memory.json

 {
+  "owners": ["yangguo@chromium.org"],
   "name": "Memory",
   "run_count": 5,
   "units": "bytes",

tools/run_perf.py

@@ -11,6 +11,7 @@ Call e.g. with tools/run-perf.py --arch ia32 some_suite.json
 The suite json format is expected to be:
 {
   "path": <relative path chunks to perf resources and main file>,
+  "owners": [<list of email addresses of benchmark owners (required)>],
   "name": <optional suite name, file name is default>,
   "archs": [<architecture name for which this suite is run>, ...],
   "binary": <name of binary to run, default "d8">,
@@ -55,6 +56,7 @@ A suite without "tests" is considered a performance test itself.
 Full example (suite with one runner):
 {
   "path": ["."],
+  "owner": ["username@chromium.org"],
   "flags": ["--expose-gc"],
   "test_flags": ["5"],
   "archs": ["ia32", "x64"],
@@ -74,6 +76,7 @@ Full example (suite with one runner):
 Full example (suite with several runners):
 {
   "path": ["."],
+  "owner": ["username@chromium.org", "otherowner@google.com"],
   "flags": ["--expose-gc"],
   "archs": ["ia32", "x64"],
   "run_count": 5,
@@ -402,6 +405,7 @@ class GraphConfig(Node):
     self._suite = suite
 
     assert isinstance(suite.get("path", []), list)
+    assert isinstance(suite.get("owners", []), list)
     assert isinstance(suite["name"], basestring)
     assert isinstance(suite.get("flags", []), list)
     assert isinstance(suite.get("test_flags", []), list)
@@ -412,6 +416,7 @@ class GraphConfig(Node):
     self.graphs = parent.graphs[:] + [suite["name"]]
     self.flags = parent.flags[:] + suite.get("flags", [])
     self.test_flags = parent.test_flags[:] + suite.get("test_flags", [])
+    self.owners = parent.owners[:] + suite.get("owners", [])
 
     # Values independent of parent node.
     self.resources = suite.get("resources", [])
@@ -452,6 +457,7 @@ class TraceConfig(GraphConfig):
   def __init__(self, suite, parent, arch):
     super(TraceConfig, self).__init__(suite, parent, arch)
     assert self.results_regexp
+    assert self.owners
 
   def CreateMeasurement(self, perform_measurement):
     if not perform_measurement: