Fix DecoderServiceHostTest

The failure was not caught by the CQ because there's no >=N
coverage in the CQ, and the test is disabled for <N.

Bug: none
Change-Id: I3003ed59630b707314cbc23b882bb57ba3ac8add
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398855Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805333}

components/browser_ui/photo_picker/android/java/src/org/chromium/components/browser_ui/photo_picker/DecoderServiceHostTest.java

@@ -5,6 +5,7 @@
 package org.chromium.components.browser_ui.photo_picker;
 
 import android.content.Context;
+import android.content.Intent;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Build;
@@ -60,6 +61,11 @@ public class DecoderServiceHostTest implements DecoderServiceHost.DecoderStatusC
     public void setUp() throws Exception {
         mContext = InstrumentationRegistry.getTargetContext();
 
+        TestThreadUtils.runOnUiThreadBlocking(() -> {
+            DecoderServiceHost.setIntentSupplier(
+                    () -> { return new Intent(mContext, TestImageDecoderService.class); });
+        });
+
         DecoderServiceHost.setStatusCallback(this);
     }