diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000..639be9dc50
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+src/chrome/android/profiles/afdo.prof
+src/chrome/build/pgo_profiles/
+src/gn/
+src/third_party/llvm-build/
+src/third_party/android_toolchain/
+src/out/
+src/.host_tool_cache/
+.vscode/
+*.pyc