Bug 816318 - Use Android DownloadManager for scanning downloads. r=mfinkle

mobile/android/app/mobile.js

@@ -144,6 +144,7 @@ pref("browser.download.manager.openDelay", 0);
 pref("browser.download.manager.focusWhenStarting", false);
 pref("browser.download.manager.flashCount", 2);
 pref("browser.download.manager.displayedHistoryDays", 7);
+pref("browser.download.manager.addToRecentDocs", true);
 
 /* download helper */
 pref("browser.helperApps.deleteTempFileOnExit", false);

mobile/android/base/AndroidManifest.xml.in

@@ -40,7 +40,7 @@
     <uses-permission android:name="@ANDROID_PACKAGE_NAME@.permissions.PASSWORD_PROVIDER"/>
     <uses-permission android:name="@ANDROID_PACKAGE_NAME@.permissions.BROWSER_PROVIDER"/>
     <uses-permission android:name="@ANDROID_PACKAGE_NAME@.permissions.FORMHISTORY_PROVIDER"/>
-
+    <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
 #ifdef MOZ_WEBSMS_BACKEND
     <!-- WebSMS -->
     <uses-permission android:name="android.permission.SEND_SMS"/>

mobile/android/base/GeckoAppShell.java

@@ -60,6 +60,7 @@ import org.mozilla.gecko.util.ThreadUtils;
 
 import android.app.Activity;
 import android.app.ActivityManager;
+import android.app.DownloadManager;
 import android.app.PendingIntent;
 import android.content.ActivityNotFoundException;
 import android.content.Context;
@@ -1796,7 +1797,7 @@ public class GeckoAppShell
     }
 
     @WrapElementForJNI
-    public static void scanMedia(String aFile, String aMimeType) {
+    public static void scanMedia(final String aFile, String aMimeType) {
         // If the platform didn't give us a mimetype, try to guess one from the filename
         if (TextUtils.isEmpty(aMimeType)) {
             int extPosition = aFile.lastIndexOf(".");
@@ -1805,9 +1806,21 @@ public class GeckoAppShell
             }
         }
 
+        final File f = new File(aFile);
+        if (AppConstants.Versions.feature12Plus) {
+            final DownloadManager dm = (DownloadManager) getContext().getSystemService(Context.DOWNLOAD_SERVICE);
+            dm.addCompletedDownload(f.getName(),
+                                    f.getName(),
+                                    !TextUtils.isEmpty(aMimeType),
+                                    aMimeType,
+                                    f.getAbsolutePath(),
+                                    f.length(),
+                                    false);
+        } else {
             Context context = getContext();
             GeckoMediaScannerClient.startScan(context, aFile, aMimeType);
         }
+    }
 
     @WrapElementForJNI(stubName = "GetIconForExtensionWrapper")
     public static byte[] getIconForExtension(String aExt, int iconSize) {