bind-gen: Get rid of gclient_paths.py

It turned out that gclient_paths.py seems not working as expected
on canary build (could be a conflict with Google-internal src).

Implements the similar (but simplified) logic without depending on
unknown factors.

Bug: 839389
Change-Id: I70032d60098c018f139bdceb78ea73996393ddfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029405Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736850}

third_party/blink/renderer/bindings/scripts/bind_gen/__init__.py

@@ -21,8 +21,6 @@ def _setup_sys_path():
         # //third_party/blink/renderer/build/scripts/blinkbuild
         os.path.join(root_dir, 'third_party', 'blink', 'renderer', 'build',
                      'scripts'),
-        # //third_party/depot_tools
-        os.path.join(root_dir, 'third_party', 'depot_tools'),
         # //third_party/mako/mako
         os.path.join(root_dir, 'third_party', 'mako'),
     ] + sys.path
@@ -47,7 +45,7 @@ def init(root_src_dir, root_gen_dir, component_reldirs):
             "//out/Default/gen" in GN.
         component_reldirs: Pairs of component and output directory.
     """
-    style_format.init()
+    style_format.init(root_src_dir)
 
     PathManager.init(
         root_src_dir=root_src_dir,

third_party/blink/renderer/bindings/scripts/bind_gen/style_format.py

@@ -4,30 +4,43 @@
 
 import os.path
 import subprocess
-
-import gclient_paths
+import sys
 
 _clang_format_command_path = None
 _gn_command_path = None
 
 
-def init():
+def init(root_src_dir):
     global _clang_format_command_path
     global _gn_command_path
 
+    assert _clang_format_command_path is None
+    assert _gn_command_path is None
+
+    root_src_dir = os.path.abspath(root_src_dir)
+
+    # Determine //buildtools/<platform>/ directory
+    if sys.platform.startswith("linux"):
+        platform = "linux64"
+        exe_suffix = ""
+    elif sys.platform.startswith("darwin"):
+        platform = "mac"
+        exe_suffix = ""
+    elif sys.platform.startswith(("cygwin", "win")):
+        platform = "win"
+        exe_suffix = ".exe"
+    else:
+        assert False, "Unknown platform: {}".format(sys.platform)
+    buildtools_platform_dir = os.path.join(root_src_dir, "buildtools",
+                                           platform)
+
     # //buildtools/<platform>/clang-format
-    command_name = "clang-format{}".format(gclient_paths.GetExeSuffix())
-    command_path = os.path.abspath(
-        os.path.join(gclient_paths.GetBuildtoolsPlatformBinaryPath(),
-                     command_name))
-    _clang_format_command_path = command_path
+    _clang_format_command_path = os.path.join(
+        buildtools_platform_dir, "clang-format{}".format(exe_suffix))
 
     # //buildtools/<platform>/gn
-    command_name = "gn{}".format(gclient_paths.GetExeSuffix())
-    command_path = os.path.abspath(
-        os.path.join(gclient_paths.GetBuildtoolsPlatformBinaryPath(),
-                     command_name))
-    _gn_command_path = command_path
+    _gn_command_path = os.path.join(buildtools_platform_dir,
+                                    "gn{}".format(exe_suffix))
 
 
 def auto_format(contents, filename):

third_party/blink/renderer/bindings/scripts/generate_bindings.pydeps

 # Generated by running:
 #   build/print_python_deps.py --root third_party/blink/renderer/bindings/scripts --output third_party/blink/renderer/bindings/scripts/generate_bindings.pydeps third_party/blink/renderer/bindings/scripts/generate_bindings.py
-../../../../depot_tools/gclient_paths.py
-../../../../depot_tools/gclient_utils.py
-../../../../depot_tools/subprocess2.py
 ../../../../mako/mako/__init__.py
 ../../../../mako/mako/_ast_util.py
 ../../../../mako/mako/ast.py