[Android WebView] AwMediaUrlInterceptor to handle media assets.

android_webview/native/aw_media_url_interceptor.cc

+// Copyright (c) 2014 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.
+
+#include <string>
+
+#include "android_webview/common/url_constants.h"
+#include "android_webview/native/aw_assets.h"
+#include "android_webview/native/aw_media_url_interceptor.h"
+#include "base/strings/string_util.h"
+#include "content/public/common/url_constants.h"
+
+namespace android_webview {
+
+bool AwMediaUrlInterceptor::Intercept(const std::string& url,
+              int* fd, int64* offset, int64* size) const{
+  const std::string asset_file_prefix(
+      std::string(url::kFileScheme) +
+      std::string(url::kStandardSchemeSeparator) +
+      android_webview::kAndroidAssetPath);
+
+  if (StartsWithASCII(url, asset_file_prefix, true)) {
+    std::string filename(url);
+    ReplaceFirstSubstringAfterOffset(&filename, 0, asset_file_prefix, "");
+    return AwAssets::OpenAsset(filename, fd, offset, size);
+  }
+
+  return false;
+}
+
+}  // namespace android_webview
+