diff --git a/build/lib/build.js b/build/lib/build.js
index 3039975e1a2b..44d2e9a5f2fe 100644
--- a/build/lib/build.js
+++ b/build/lib/build.js
@@ -1,10 +1,58 @@
 const config = require('../lib/config')
 const util = require('../lib/util')
+const path = require('path')
+const fs = require('fs-extra')
+
+const touchOverriddenFiles = (filter) => {
+  console.log('touch original files overridden by chromium_src...')
+
+  // Return true when original file of |file| should be touched.
+  const applyFileFilter = (file) => {
+    // Exclude test files
+    if (file.indexOf('browsertest') > -1 || file.indexOf('unittest') > -1) { return false }
+
+    // Only includes cc and h files.
+    const ext = path.extname(file)
+    if (ext !== '.cc' && ext !== '.h') { return false }
+
+    // Touch all overridden files.
+    if (filter === '*') { return true }
+
+    return file.match(filter)
+  }
+
+  const walkSync = (dir, filelist = []) => {
+    fs.readdirSync(dir).forEach(file => {
+      if (fs.statSync(path.join(dir, file)).isDirectory()) {
+        filelist = walkSync(path.join(dir, file), filelist)
+      } else if (applyFileFilter(file)) {
+        filelist = filelist.concat(path.join(dir, file))
+      }
+    })
+    return filelist
+  }
+
+  const chromiumSrcDir = path.join(config.srcDir, 'brave', 'chromium_src')
+  var sourceFiles = walkSync(chromiumSrcDir)
+
+  // Touch original files by updating mtime.
+  const chromiumSrcDirLen = chromiumSrcDir.length
+  sourceFiles.forEach(file => {
+    const targetOriginalFile = path.join(config.srcDir, file.slice(chromiumSrcDirLen))
+    const date = new Date()
+    fs.utimesSync(targetOriginalFile, date, date)
+    console.log(targetOriginalFile + ' is touched.')
+  })
+}
 
 const build = (buildConfig = config.defaultBuildConfig, options) => {
   config.buildConfig = buildConfig
   config.update(options)
 
+  if (options.touch_overridden_files) {
+    touchOverriddenFiles(options.touch_overridden_files)
+  }
+
   if (!options.no_branding_update) {
     util.updateBranding()
   }
diff --git a/build/scripts/commands.js b/build/scripts/commands.js
index 3eaa6ab0c7da..00105d00f11a 100644
--- a/build/scripts/commands.js
+++ b/build/scripts/commands.js
@@ -37,6 +37,7 @@ program
   .option('--brave_google_api_endpoint <brave_google_api_endpoint>')
   .option('--no_branding_update', 'don\'t copy BRANDING to the chrome theme dir')
   .option('--channel <target_chanel>', 'target channel to build', /^(beta|canary|dev|release)$/i, 'release')
+  .option('--touch_overridden_files <target filter>', 'touch original files overridden by chromium_src. Pass '*' to touch all files')
   .arguments('[build_config]')
   .action(build)