Fix chrome upload with content uri

base/android/java/src/org/chromium/base/ContentUriUtils.java

Index: base/android/java/src/org/chromium/base/ContentUriUtils.java
diff --git a/base/android/java/src/org/chromium/base/ContentUriUtils.java b/base/android/java/src/org/chromium/base/ContentUriUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..c639396a19a26c1125484d6df8d27354a5f71bc7
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/ContentUriUtils.java
@@ -0,0 +1,76 @@
+// Copyright (c) 2013 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.
+
+package org.chromium.base;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.net.Uri;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+
+import org.chromium.base.CalledByNative;
+
+/**
+ * This class provides methods to access content URI schemes.
+ */
+abstract class ContentUriUtils {
+    private static final String TAG = "ContentUriUtils";
+
+    // Prevent instantiation.
+    private ContentUriUtils() {}
+
+    /**
+     * Opens the content URI for reading, and returns the file descriptor to
+     * the caller. The caller is responsible for closing the file desciptor.
+     *
+     * @param context {@link Context} in interest
+     * @param uriString the content URI to open
+     * @returns file desciptor upon sucess, or -1 otherwise.
+     */
+    @CalledByNative
+    public static int openContentUriForRead(Context context, String uriString) {
+        ParcelFileDescriptor pfd = getParcelFileDescriptor(context, uriString);
+        if (pfd != null) {
+            return pfd.detachFd();
+        }
+        return -1;
+    }
+
+    /**
+     * Check whether a content URI exists.
+     *
+     * @param context {@link Context} in interest.
+     * @param uriString the content URI to query.
+     * @returns true if the uri exists, or false otherwise.
+     */
+    @CalledByNative
+    public static boolean contentUriExists(Context context, String uriString) {
+        ParcelFileDescriptor pfd = getParcelFileDescriptor(context, uriString);
+        if (pfd == null) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Helper method to open a content URI and return the ParcelFileDescriptor.
+     *
+     * @param context {@link Context} in interest.
+     * @param uriString the content URI to open.
+     * @returns ParcelFileDescriptor of the content URI, or NULL if the file does not exist.
+     */
+    private static ParcelFileDescriptor getParcelFileDescriptor(Context context, String uriString) {
+        ContentResolver resolver = context.getContentResolver();
+        Uri uri = Uri.parse(uriString);
+
+        ParcelFileDescriptor pfd = null;
+        try {
+            pfd = resolver.openFileDescriptor(uri, "r");
+        } catch (java.io.FileNotFoundException e) {
+            Log.w(TAG, "Cannot find content uri: " + uriString, e);
+        }
+        return pfd;
+    }
+}