Add luci-go tool to be fetched via CIPD

Do not remove the adhoc mechanism on GCS that predates CIPD yet, as the recipes
need to be updated.

Change analyze to not ignore changes to isolate.

R=tandrii@chromium.org

Bug: 851596
Change-Id: Ic068db83dea4c3a0f17b55181de523b16c9838a5
Reviewed-on: https://chromium-review.googlesource.com/1097623
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569688}

DEPS

@@ -346,6 +346,16 @@ deps = {
       'condition': 'checkout_nacl',
   },
 
+  'src/tools/luci-go': {
+      'packages': [
+        {
+          'package': 'infra/tools/luci/isolate/${{platform}}',
+          'version': 'git_revision:8b15ba47cbaf07a56f93326e39f0c8e5069c19e8',
+        },
+      ],
+      'dep_type': 'cipd',
+  },
+
   'src/third_party/SPIRV-Tools/src':
     Var('chromium_git') + '/external/github.com/KhronosGroup/SPIRV-Tools.git' + '@' + '9166854ac93ef81b026e943ccd230fed6c8b8d3c',
 
@@ -1705,6 +1715,7 @@ hooks = [
     ],
   },
   # Pull luci-go binaries (isolate, swarming) using checked-in hashes.
+  # TODO(maruel): Remove, https://crbug.com/851596
   {
     'name': 'luci-go_win',
     'pattern': '.',

testing/buildbot/trybot_analyze_config.json

@@ -32,8 +32,7 @@
       "testing/scripts/.*",
       "testing/test_env.py",
       "third_party/android_platform/development/scripts/.*",
-      "tools/clang/blink_gc_plugin/CMakeLists.txt",
-      "tools/luci-go/.*"
+      "tools/clang/blink_gc_plugin/CMakeLists.txt"
     ],
     "ignores": [
       "infra/config/recipes.cfg",

tools/luci-go/.gitignore

+/isolate
+/isolate.exe
 /linux64/isolate
 /mac64/isolate
 /win64/isolate.exe

tools/luci-go/OWNERS

-djd@chromium.org
 maruel@chromium.org
 tandrii@chromium.org
-tansell@chromium.org
 vadimsh@chromium.org

tools/luci-go/README.md

@@ -2,9 +2,4 @@
 
 Contains executable built out of
 https://chromium.googlesource.com/infra/luci/luci-go/+/master/client/cmd
-
-The binaries are retrieved from the following builders:
-
-- mac64: http://build.chromium.org/p/chromium.infra/builders/infra-continuous-mac-10.10-64/
-- linux64: http://build.chromium.org/p/chromium.infra/builders/infra-continuous-precise-64/
-- win64: http://build.chromium.org/p/chromium.infra/builders/infra-continuous-win-64/
+Mapped through CIPD.