Switch ChromeDriver builders from GYP to GN.

scripts/slave/recipes/chromium.chromedriver.recipe_autogen.py

Index: scripts/slave/recipes/chromium.chromedriver.recipe_autogen.py
diff --git a/scripts/slave/recipes/chromium.chromedriver.recipe_autogen.py b/scripts/slave/recipes/chromium.chromedriver.recipe_autogen.py
index a9c3324a77971675bf1266b50feec515ebf12970..813e58e7ee176ffe712fe6f83851f88c2ff7f19c 100644
--- a/scripts/slave/recipes/chromium.chromedriver.recipe_autogen.py
+++ b/scripts/slave/recipes/chromium.chromedriver.recipe_autogen.py
@@ -53,27 +53,28 @@ def Linux32_steps(api):
   build_properties.update(result.json.output.get('properties', {}))
   # gclient update step; made unnecessary by bot_update
   # gclient runhooks wrapper step
-  env = {'CHROMIUM_GYP_SYNTAX_CHECK': '1', 'LANDMINES_VERBOSE': '1',
-      'DEPOT_TOOLS_UPDATE': '0',
-      'GYP_DEFINES':
-      'branding=Chrome buildtype=Official component=static_library'}
+  env = {'LANDMINES_VERBOSE': '1', 'DEPOT_TOOLS_UPDATE': '0'}
   api.python("gclient runhooks wrapper", api.path["build"].join("scripts",
     "slave", "runhooks_wrapper.py"), env=env)
   # cleanup_temp step
   api.chromium.cleanup_temp()
+  # meta build step
+  api.python("meta build", api.path["checkout"].join("tools", "mb", "mb.py",

[jbudorick, 2016/07/22 00:45:01]

This should be:

  api.python('meta build', api.path['checkout'].join('tools', 'mb', 'mb.py'),
args=['gen', '-m', ...])

[samuong, 2016/07/22 02:49:12]

Done.

+      "gen", "-m", "chromium.chromedriver", "-b", "Linux32", "//out/Default"))
   # chromedriver compile.py step
   api.python("compile", api.path["build"].join("scripts", "slave",
-    "compile.py"), args=['--target', 'Release',
-      'chromium_builder_chromedriver'])
+    "compile.py"), args=['--target', 'Default',
+      'chromedriver', 'chromedriver_tests', 'chromedriver_unittests'])
+  # strip binary
+  api.m.step('strip', cmd=['strip', str(api.path['checkout'].join(

[jbudorick, 2016/07/22 00:45:01]

What's with the strip step?

[samuong, 2016/07/22 02:49:12]

I'm seeing very large (144M) binaries when I build with GN. After we strip, this
goes down to ~7M. There's a bit more context at
https://bugs.chromium.org/p/chromedriver/issues/detail?id=1384.

[jbudorick, 2016/07/22 02:58:31]

That's what I get for not reading that bug closely enough. SGTM.

+      'out', 'Default', 'chromedriver'))])
   # annotated_steps step
   api.python("annotated_steps", api.path["build"].join("scripts", "slave",
     "chromium", "chromedriver_buildbot_run.py"),
     args=['--build-properties=%s' % api.json.dumps(build_properties,
       separators=(',', ':')), '--factory-properties={"annotated_script":'+\
           '"chromedriver_buildbot_run.py","blink_config":"chromium",'+\
-          '"gclient_env":{"CHROMIUM_GYP_SYNTAX_CHECK":"1",'+\
-          '"DEPOT_TOOLS_UPDATE"'':"0","GYP_DEFINES":"branding=Chrome '+\
-          'buildtype=Official component=static_library","LANDMINES_VERBOSE":'+\
+          '"gclient_env":{"DEPOT_TOOLS_UPDATE":"0","LANDMINES_VERBOSE":'+\
           '"1"},"needs_webdriver_java_tests":true,"use_xvfb_on_linux":true}'],
     allow_subannotations=True)