Allow OpenApkAsset() to open resource files as well as assets.

base/android/apk_assets.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_ANDROID_APK_ASSETS_H_
 #define BASE_ANDROID_APK_ASSETS_H_
 
 #include <string>
 
 #include "base/android/jni_android.h"
 #include "base/files/memory_mapped_file.h"
 #include "base/posix/global_descriptors.h"
 
 namespace base {
 namespace android {
 
 bool RegisterApkAssets(JNIEnv* env);
 
 // Opens an asset (e.g. a .pak file) from the apk.
 // Can be used from renderer process.
 // Fails if the asset is not stored uncompressed within the .apk.
 // Returns: The File Descriptor of the asset, or -1 upon failure.
+// Input arguments:
+// - |file_path|: Path to file within .apk. e.g.: assets/foo.pak
 // Output arguments:
 // - |region|: size & offset (in bytes) within the .apk of the asset.
 BASE_EXPORT int OpenApkAsset(
-    const std::string& filename,
+    const std::string& file_path,
     base::MemoryMappedFile::Region* region);
 
 // Registers an uncompressed asset from within the apk with GlobalDescriptors.
 // Returns: true in case of success, false otherwise.
 BASE_EXPORT bool RegisterApkAssetWithGlobalDescriptors(
     base::GlobalDescriptors::Key key,
-    const std::string& asset_filename);
+    const std::string& file_path);
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_APK_ASSETS_H_