Introduce proximity_auth component.

components/proximity_auth/run_all_unittests.cc

 // Copyright 2014 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.
 
 #include "base/bind.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_suite.h"
 
+namespace {
+
+class ProximityAuthTestSuite : public base::TestSuite {

[blundell, 2014/08/27 13:41:58]

This isn't necessary. Instead, you'll just add your unittests to
components_tests.gyp.

[Tim Song, 2014/08/27 19:40:06]

I would strongly like to have a separate executable for these tests for a couple
of reasons:

1. There will be over a dozen test suites, and it would be unwieldy to prefix
everything so they can easily be filtered.

2. components_unittests depends on a lot of libraries that we don't need (e.g.
WebKit), so the compile and link times are unnecessarily long.

I created a separate target in components_tests.gyp for these tests. Let me know
if you agree with this reasoning.

[Ilya Sherman, 2014/08/27 19:44:48]

My understanding is that the difficulty with adding new test suites is that we
have to update all the bots to be aware of these test suites.

FWIW, I've generally found the compile and link times for components_unittests
to be fairly reasonable, though I agree that if we could have separate targets
without too much difficulty, that would be even better.

+ public:
+  ProximityAuthTestSuite(int argc, char** argv)
+    : base::TestSuite(argc, argv) {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ProximityAuthTestSuite);
+};
+
+}  // namespace
+
 int main(int argc, char** argv) {
-  base::TestSuite test_suite(argc, argv);
+  ProximityAuthTestSuite test_suite(argc, argv);
+
   return base::LaunchUnitTests(argc,
                                argv,
-                               base::Bind(&base::TestSuite::Run,
+                               base::Bind(&ProximityAuthTestSuite::Run,
                                           base::Unretained(&test_suite)));
 }