MediaUrlInterceptor for embedders to handle custom urls.

content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java

Index: content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java b/content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java
index 5e1fa49e38fbe1951085b7c31241be503ac0e8b5..d6955fa86a6fba1ab03727b974db9121235a170e 100644
--- a/content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java
+++ b/content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java
@@ -9,6 +9,7 @@ import android.content.pm.PackageManager;
 import android.media.MediaMetadataRetriever;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
+import android.os.ParcelFileDescriptor;
 import android.text.TextUtils;
 import android.util.Log;
 
@@ -117,6 +118,23 @@ class MediaResourceGetter {
                 context, url, cookies, userAgent);
     }
 
+    @CalledByNative
+    private static MediaMetadata extractMediaMetadataFromFd(int fd,
+                                                            long offset,
+                                                            long length) {
+        return new MediaResourceGetter().extract(fd, offset, length);
+    }
+
+    @VisibleForTesting
+    MediaMetadata extract(int fd, long offset, long length) {
+        if (!androidDeviceOk(android.os.Build.MODEL, android.os.Build.VERSION.SDK_INT)) {
+            return EMPTY_METADATA;
+        }
+
+        configure(fd, offset, length);
+        return doExtractMetadata();
+    }
+
     @VisibleForTesting
     MediaMetadata extract(final Context context, final String url,
                           final String cookies, final String userAgent) {
@@ -128,7 +146,10 @@ class MediaResourceGetter {
             Log.e(TAG, "Unable to configure metadata extractor");
             return EMPTY_METADATA;
         }
+        return doExtractMetadata();
+    }
 
+    private MediaMetadata doExtractMetadata() {
         try {
             String durationString = extractMetadata(
                     MediaMetadataRetriever.METADATA_KEY_DURATION);
@@ -367,6 +388,21 @@ class MediaResourceGetter {
     }
 
     @VisibleForTesting
+    void configure(int fd, long offset, long length) {
+        ParcelFileDescriptor parcelFd = ParcelFileDescriptor.adoptFd(fd);
+        try {
+            mRetriever.setDataSource(parcelFd.getFileDescriptor(),
+                    offset, length);
+        } finally {
+            try {
+                parcelFd.close();
+            } catch (IOException e) {
+                Log.e(TAG, "Failed to close file descriptor: " + e);
+            }
+        }
+    }
+
+    @VisibleForTesting
     void configure(String url, Map<String,String> headers) {
         mRetriever.setDataSource(url, headers);
     }