Copy cdb.exe to build_root_dir so it's available to isolated tests

build/toolchain/win/BUILD.gn

Index: build/toolchain/win/BUILD.gn
diff --git a/build/toolchain/win/BUILD.gn b/build/toolchain/win/BUILD.gn
index 8efa40c26314fa1dfe14795242fe284f02863fee..3a7134e731aa60f8a67e6ca54a084abc86ce473b 100644
--- a/build/toolchain/win/BUILD.gn
+++ b/build/toolchain/win/BUILD.gn
@@ -44,6 +44,17 @@ if (current_toolchain == default_toolchain) {
               ])
 }
 
+# Copy cdb.exe for the default toolchain to the root build directory for
+# isolated tests that need to symbolize minidumps.
+if (current_toolchain == default_toolchain) {
+  exec_script("../../vs_toolchain.py",
+              [
+                "copy_debugger",
+                rebase_path(root_build_dir),
+                target_cpu,
+              ])
+}

[Dirk Pranke, 2017/02/10 18:06:18]

Can we merge this into the prior exec_script() call to make things faster?

+
 # Parameters:
 #   environment: File name of environment file.
 #