Enabling autoplay and fullscreen for downloaded media

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
index 13953ad51a69b4fe17a4e18497c14c3d7c79c9d6..157658d72ffe84d767620d30b4d35a6a11ce7541 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
@@ -72,6 +72,7 @@ public class DownloadUtils {
 
     private static final String DEFAULT_MIME_TYPE = "*/*";
     private static final String MIME_TYPE_DELIMITER = "/";
+    private static final String MIME_TYPE_VIDEO = "video";
 
     private static final String EXTRA_IS_OFF_THE_RECORD =
             "org.chromium.chrome.browser.download.IS_OFF_THE_RECORD";
@@ -419,6 +420,8 @@ public class DownloadUtils {
         intent.setData(contentUri);
         intent.putExtra(CustomTabIntentDataProvider.EXTRA_IS_MEDIA_VIEWER, true);
         intent.putExtra(CustomTabIntentDataProvider.EXTRA_MEDIA_VIEWER_URL, fileUri.toString());
+        intent.putExtra(CustomTabIntentDataProvider.EXTRA_ENABLE_EMBEDDED_MEDIA_EXPERIENCE,
+                isMimeTypeVideo(mimeType));
         intent.putExtra(
                 CustomTabIntentDataProvider.EXTRA_INITIAL_BACKGROUND_COLOR, mediaColor);
         intent.putExtra(
@@ -657,4 +660,13 @@ public class DownloadUtils {
         int remainingLength = limit - extensionLength;
         return fileName.substring(0, remainingLength) + ELLIPSIS + fileName.substring(index);
     }
+
+    private static boolean isMimeTypeVideo(String mimeType) {
+        if (TextUtils.isEmpty(mimeType)) return false;
+
+        String[] pieces = mimeType.split(MIME_TYPE_DELIMITER);
+        if (pieces.length != 2) return false;
+
+        return MIME_TYPE_VIDEO.equals(pieces[0]);
+    }
 }