Check that Diagnostic subclasses are registered in presubmit.

tracing/bin/validate_all_diagnostics

Index: tracing/bin/validate_all_diagnostics
diff --git a/tracing/bin/validate_all_diagnostics b/tracing/bin/validate_all_diagnostics
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index 0000000000000000000000000000000000000000..16fa8bb9a91dc81a680d310a93f809dce08791cf
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+++ b/tracing/bin/validate_all_diagnostics
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+# Copyright 2017 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.
+
+import argparse
+import json
+import os
+import string
+import sys
+
+sys.path.insert(
+    1,
+    os.path.join(os.path.dirname(os.path.realpath(__file__)), '..'))
+import tracing_project
+tracing_project.UpdateSysPathIfNeeded()
+import vinn
+
+
+_DISCOVER_CMDLINE = os.path.join(
+    os.path.dirname(__file__), '..', 'tracing', 'value', 'diagnostics',
+    'discover_cmdline.html')
+
+
+def DiscoverDiagnostics(project, js_args):
+  res = vinn.RunFile(_DISCOVER_CMDLINE, source_paths=list(project.source_paths),
+      js_args=js_args)
+  if res.returncode != 0:
+    raise RuntimeError('Error running diagnostics/discover_cmdline: ' + res.stdout)
+  else:
+    return set([str(m) for m in json.loads(res.stdout)])
+
+
+def Main():
+  project = tracing_project.TracingProject()
+  all_registered_diagnostics = DiscoverDiagnostics(
+    project, ['registry', '/tracing/value/diagnostics/all_diagnostics.html'])
+  all_modules = list(
+      '/' + rel_path for rel_path in
+      tracing_project.TracingProject().FindAllDiagnosticsModuleRelPaths())
+  all_possible_diagnostics = DiscoverDiagnostics(
+    project, ['namespace'] + all_modules)
+
+  unregistered_diagnostics = (all_possible_diagnostics -
+      all_registered_diagnostics)
+  if unregistered_diagnostics:
+    print ('These diagnostics are unregistered: %s. Please import their modules in '
+           'tracing/tracing/value/diagnostics/all_diagnostics.html and '
+           'ensure that they call Diagnostic.register().' %
+           ', '.join(unregistered_diagnostics))
+    return 1
+
+  lowercased_diagnostics = []
+  for m in all_possible_diagnostics:
+    if str.islower(m[0]):
+      lowercased_diagnostics.append(m)
+  if lowercased_diagnostics:
+    print ('These diagnostics must be renamed to start with a upper-case: %s' %
+           lowercased_diagnostics)
+    return 1
+
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(Main())