diff --git a/tools_webrtc/iwyu/apply-include-cleaner b/tools_webrtc/iwyu/apply-include-cleaner
index c96bf35a5e..262b6019e3 100755
--- a/tools_webrtc/iwyu/apply-include-cleaner
+++ b/tools_webrtc/iwyu/apply-include-cleaner
@@ -55,8 +55,8 @@ error() {
 WORKDIR=out/Default
 
 usage() {
-  echo "Usage: $0 [-r] file.cc"
-  echo "Runs the include-cleaner tool on a file"
+  echo "Usage: $0 [-r] file.cc [file2.cc ...]"
+  echo "Runs the include-cleaner tool on a list of files"
   echo "Arguments:"
   echo " -n : Just print changes, don't do them"
   echo " -c : Just return non-zero exit code if there are changes, don't do them"
@@ -95,39 +95,47 @@ if [[ -z "$COMPILE_COMMANDS" ]]; then
   fi
 fi
 
-FILE="$1"
-
-if [ -z $FILE ] || [ ! -f $FILE ]; then
-  usage
-  error "File $FILE is not found"
-fi
-
-# Run the command in $WORKDIR because of this reported issue:
-# https://github.com/llvm/llvm-project/issues/110843
-cd $WORKDIR
-OUTPUT=$(../../$CLEANER $INCLUDE_ARGS $COMMAND ../../$FILE)
-cd -
-
-# include-cleaner does not support custom mappings for certain deps
-# this ensures that the gtest/gmock deps it inserts are replaced
-# with the right paths for those includes.
-# Since sed inplace argument acts differently between GNU/BSD based systems
-# we handle this here.
-case "$(uname -s)" in
-    Linux*)     INPLACE_ARG=( -i );;
-    Darwin*)    INPLACE_ARG=( -i '' );;
-    *)          INPLACE_ARG=( -i )
-esac
-for INCLUDE in "gtest" "gmock"; do
-  if grep -q "#include \"test\/${INCLUDE}\.h\"" $FILE; then
-    OUTPUT=${OUTPUT//"+ \"${INCLUDE}"\/"${INCLUDE}.h\""/}
-    sed "${INPLACE_ARG[@]}" -e "/#include \"${INCLUDE}\/${INCLUDE}\.h\"/d" $FILE
-  else
-    sed "${INPLACE_ARG[@]}" -e "s@^#include \"${INCLUDE}\/${INCLUDE}\.h@#include \"test\/${INCLUDE}\.h@g" $FILE
+# To get a list of files in a commit: git diff-tree --no-commit-id --name-only -r HEAD
+for FILE in "$@"
+do
+  if [ -z $FILE ] || [ ! -f $FILE ]; then
+    usage
+    error "File $FILE is not found"
   fi
 done
 
-echo "${OUTPUT}"
+HAS_OUTPUT=false
+for FILE in "$@"
+do
+  # Run the command in $WORKDIR because of this reported issue:
+  # https://github.com/llvm/llvm-project/issues/110843
+  cd $WORKDIR
+  OUTPUT=$(../../$CLEANER $INCLUDE_ARGS $COMMAND ../../$FILE)
+  cd -
+
+  # include-cleaner does not support custom mappings for certain deps
+  # this ensures that the gtest/gmock deps it inserts are replaced
+  # with the right paths for those includes.
+  # Since sed inplace argument acts differently between GNU/BSD based systems
+  # we handle this here.
+  case "$(uname -s)" in
+      Linux*)     INPLACE_ARG=( -i );;
+      Darwin*)    INPLACE_ARG=( -i '' );;
+      *)          INPLACE_ARG=( -i )
+  esac
+  for INCLUDE in "gtest" "gmock"; do
+    if grep -q "#include \"test\/${INCLUDE}\.h\"" $FILE; then
+      OUTPUT=${OUTPUT//"+ \"${INCLUDE}"\/"${INCLUDE}.h\""/}
+      sed "${INPLACE_ARG[@]}" -e "/#include \"${INCLUDE}\/${INCLUDE}\.h\"/d" $FILE
+    else
+      sed "${INPLACE_ARG[@]}" -e "s@^#include \"${INCLUDE}\/${INCLUDE}\.h@#include \"test\/${INCLUDE}\.h@g" $FILE
+    fi
+  done
+
+  echo "${OUTPUT}"
+  HAS_OUTPUT=$HAS_OUTPUT || [[ ! -z $OUTPUT ]]
+done
+
 echo "Finished. Check diff, compile, gn gen --check and git cl format"
 echo "before uploading."