Copying our pre-generated midl files to overwrite upstream midl files

Chromum compares pre-installed midl files and generated midl files from
IDL file during the build to check integrity.
Generated files during the build time and upstream generated files are
different because we use different IDL files for google update.
So, we should copy our pre-installed files to overwrite upstream
pre-installed files.

Also, these files should not be the target of update_patches command.

lib/updatePatches.js

@@ -16,7 +16,7 @@ const updatePatches = (options) => {
   let modifiedDiff = util.run('git', modifiedDiffArgs, runOptions)
   let moddedFileList = modifiedDiff.stdout.toString()
     .split('\n')
-    .filter(s => s.length > 0 && !s.endsWith('.xtb'))
+    .filter(s => s.length > 0 && !s.endsWith('.xtb') && !s.includes('google_update_idl'))
 
   let n = moddedFileList.length
 

lib/util.js

@@ -73,9 +73,23 @@ const util = {
     fs.copySync(path.join(braveAppDir, 'strings'), path.join(chromeComponentsDir, 'strings'))
   },
 
+  // Chromium compares pre-installed midl files and generated midl files from IDL during the build to check integrity.
+  // Generated files during the build time and upstream pre-installed files are different because we use different IDL file.
+  // So, we should copy our pre-installed files to overwrite upstream pre-installed files.
+  // After checking, pre-installed files are copied to gen dir and they are used to compile.
+  // So, this copying in every build doesn't affect compile performance.
+  updateOmahaMidlFiles: () => {
+    console.log('update omaha midl files...')
+    const srcDir = path.join(config.projects['brave-core'].dir, 'win_build_output', 'midl', 'google_update')
+    const dstDir = path.join(config.srcDir, 'third_party', 'win_build_output', 'midl', 'google_update')
+    fs.copySync(srcDir, dstDir)
+  },
+
   buildMuon: (target = 'brave', options = config.defaultOptions) => {
     console.log('building ' + target + '...')
 
+    util.updateOmahaMidlFiles()
+
     const args = util.buildArgsToString(config.buildArgs())
     util.run('gn', ['gen', config.outputDir, '--args="' + args + '"'], options)
     util.run('ninja', ['-C', config.outputDir, target], options)