Deduplicate Monochrome locale .paks

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index bf53a1314e39afe87aa4569ac7fa5577eb2c88a4..1c1a0d77e7f59264e039d6bdca0945c2d11dd1e7 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -248,6 +248,17 @@ ResourceBundle& ResourceBundle::GetSharedInstance() {
   return *g_shared_instance_;
 }
 
+void ResourceBundle::LoadSecondaryLocaleDataWithPakFileRegion(
+    base::File pak_file,
+    const base::MemoryMappedFile::Region& region) {
+  std::unique_ptr<DataPack> data_pack(new DataPack(SCALE_FACTOR_100P));
+  if (!data_pack->LoadFromFileRegion(std::move(pak_file), region)) {
+    NOTREACHED() << "failed to load secondary pak file";
+    return;
+  }
+  g_shared_instance_->secondary_locale_resources_data_ = std::move(data_pack);
+}
+
 #if !defined(OS_ANDROID)
 bool ResourceBundle::LocaleDataPakExists(const std::string& locale) {
   return !GetLocaleFilePath(locale, true).empty();
@@ -389,6 +400,7 @@ void ResourceBundle::LoadTestResources(const base::FilePath& path,
 
 void ResourceBundle::UnloadLocaleResources() {
   locale_resources_data_.reset();
+  secondary_locale_resources_data_.reset();
 }
 
 void ResourceBundle::OverrideLocalePakForTest(const base::FilePath& pak_path) {
@@ -550,20 +562,27 @@ base::string16 ResourceBundle::GetLocalizedString(int message_id) {
   }
 
   base::StringPiece data;
+  ResourceHandle::TextEncodingType encoding =
+      locale_resources_data_->GetTextEncodingType();
   if (!locale_resources_data_->GetStringPiece(static_cast<uint16_t>(message_id),
                                               &data)) {
-    // Fall back on the main data pack (shouldn't be any strings here except in
-    // unittests).
-    data = GetRawDataResource(message_id);
-    if (data.empty()) {
-      NOTREACHED() << "unable to find resource: " << message_id;
-      return base::string16();
+    if (secondary_locale_resources_data_.get() &&
+        secondary_locale_resources_data_->GetStringPiece(
+            static_cast<uint16_t>(message_id), &data)) {
+      // Fall back on the secondary locale pak if it exists.
+      encoding = secondary_locale_resources_data_->GetTextEncodingType();
+    } else {
+      // Fall back on the main data pack (shouldn't be any strings here except
+      // in unittests).
+      data = GetRawDataResource(message_id);
+      if (data.empty()) {
+        NOTREACHED() << "unable to find resource: " << message_id;
+        return base::string16();
+      }
     }
   }
 
   // Strings should not be loaded from a data pack that contains binary data.
-  ResourceHandle::TextEncodingType encoding =
-      locale_resources_data_->GetTextEncodingType();
   DCHECK(encoding == ResourceHandle::UTF16 || encoding == ResourceHandle::UTF8)
       << "requested localized string from binary pack file";
 
@@ -588,6 +607,11 @@ base::RefCountedMemory* ResourceBundle::LoadLocalizedResourceBytes(
             static_cast<uint16_t>(resource_id), &data) &&
         !data.empty()) {
       return new base::RefCountedStaticMemory(data.data(), data.length());
+    } else if (secondary_locale_resources_data_.get() &&
+        secondary_locale_resources_data_->GetStringPiece(
+            static_cast<uint16_t>(resource_id), &data) &&
+        !data.empty()) {
+      return new base::RefCountedStaticMemory(data.data(), data.length());
     }
   }
   // Release lock_scope and fall back to main data pack.