Convert Android WebView to store locale .pak files as res/raw resources

ui/android/java/src/org/chromium/ui/base/ResourceBundle.java

Index: ui/android/java/src/org/chromium/ui/base/ResourceBundle.java
diff --git a/ui/android/java/src/org/chromium/ui/base/ResourceBundle.java b/ui/android/java/src/org/chromium/ui/base/ResourceBundle.java
index a17975c3a723fc06dc18301859f218faa4c74f52..b29a291b873a778113900c6cca4bc16b52b81b5b 100644
--- a/ui/android/java/src/org/chromium/ui/base/ResourceBundle.java
+++ b/ui/android/java/src/org/chromium/ui/base/ResourceBundle.java
@@ -5,28 +5,86 @@
 package org.chromium.ui.base;
 
 import android.content.Context;
-import android.content.res.AssetFileDescriptor;
-import android.content.res.AssetManager;
+import android.content.res.Resources;
+import android.content.res.TypedArray;
 
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
+import org.chromium.base.ResourceExtractor;
+import org.chromium.base.ThreadUtils;
+import org.chromium.base.annotations.SuppressFBWarnings;
 
-import java.io.IOException;
+import java.io.File;
+import java.util.Locale;
 
 /**
- * This class provides the resource bundle related methods for the native library.
+ * This class provides the resource bundle related methods for the native
+ * library.
  */
 @JNINamespace("ui")
-class ResourceBundle {
-    @CalledByNative
-    static boolean assetContainedInApk(Context ctx, String filename) {
+public class ResourceBundle {
+    private static ResourceExtractor.ResourceEntry[] sActiveLocaleResources;
+
+    /**
+     * Applies the reverse mapping done by locale_pak_resources.py.
+     */
+    private static String toChromeLocaleName(String srcFileName) {
+        srcFileName = srcFileName.replace(".lpak", ".pak");
+        String[] parts = srcFileName.split("_");
+        if (parts.length > 1) {
+            int dotIdx = parts[1].indexOf('.');
+            return parts[0] + "-" + parts[1].substring(0, dotIdx).toUpperCase(Locale.ENGLISH)
+                    + parts[1].substring(dotIdx);
+        }
+        return srcFileName;
+    }
+
+    /**
+     * Initializes the list of locale packs for the active locale that are
+     * present within the apk.
+     *
+     * @param context Any context
+     * @param localePaksResId Resource ID locale_paks (generated by
+     *            locale_pak_resources.py)
+     */
+    @SuppressFBWarnings("LI_LAZY_INIT_UPDATE_STATIC")  // Not thread-safe.
+    public static void initializeLocalePaks(Context context, int localePaksResId) {
+        ThreadUtils.assertOnUiThread();
+        assert sActiveLocaleResources == null;
+        Resources resources = context.getResources();
+        TypedArray resIds = resources.obtainTypedArray(localePaksResId);
         try {
-            AssetManager am = ctx.getAssets();
-            AssetFileDescriptor afd = am.openFd(filename);
-            afd.close();
-            return true;
-        } catch (IOException e) {
-            return false;
+            int len = resIds.length();
+            sActiveLocaleResources = new ResourceExtractor.ResourceEntry[len];
+            for (int i = 0; i < len; ++i) {
+                int resId = resIds.getResourceId(i, 0);
+                String resPath = resources.getString(resId);
+                String srcBaseName = new File(resPath).getName();
+                String dstBaseName = toChromeLocaleName(srcBaseName);
+                sActiveLocaleResources[i] = new ResourceExtractor.ResourceEntry(resId, resPath,
+                        dstBaseName);
+            }
+        } finally {
+            resIds.recycle();
+        }
+    }
+
+    @SuppressFBWarnings("MS_EXPOSE_REP")  // Don't modify the array.
+    public static ResourceExtractor.ResourceEntry[] getActiveLocaleResources() {
+        return sActiveLocaleResources;
+    }
+
+    @CalledByNative
+    private static String getLocalePakResourcePath(String locale) {
+        if (sActiveLocaleResources == null) {
+            return null;
+        }
+        String fileName = locale + ".pak";
+        for (ResourceExtractor.ResourceEntry entry : sActiveLocaleResources) {
+            if (fileName.equals(entry.extractedFileName)) {
+                return entry.pathWithinApk;
+            }
         }
+        return null;
     }
 }