[Downloads] Add Incognito support

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 09f820d02c26b47b4e969a1f98116ff591474242..d875a2c6a582e8eefaaa401643e52892bb28838e 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
@@ -5,7 +5,9 @@
 package org.chromium.chrome.browser.download;
 
 import android.app.Activity;
+import android.content.Intent;
 
+import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.content_public.browser.LoadUrlParams;
@@ -23,7 +25,11 @@ public class DownloadUtils {
         if (DeviceFormFactor.isTablet(activity)) {
             tab.loadUrl(new LoadUrlParams(UrlConstants.DOWNLOADS_URL));
         } else {
-            DownloadActivity.launch(activity);
+            Intent intent = new Intent();
+            intent.setClass(activity, DownloadActivity.class);
+            intent.putExtra(IntentHandler.EXTRA_PARENT_COMPONENT, activity.getComponentName());
+            intent.putExtra(IntentHandler.EXTRA_OPEN_NEW_INCOGNITO_TAB, tab.isIncognito());

[Ian Wen, 2016/08/15 23:17:27]

Haha you are sneaky.

It's a bit weird to use this constant, since this is not strictly about "open
new tab". Yet I don't see this to be a super big issue. I might leave it as is.

[gone, 2016/08/15 23:29:49]

Yeah... I wasn't sure if it was worth adding yet another extra for "use
incognito".  Theresa didn't feel too strongly about it either.

+            activity.startActivity(intent);
         }
     }
 }