feed v2: Add postTask to xsurface

Bug: b/165288064, 1117571
Change-Id: Id7d98858484644044c5ac6da8714541a0eae0d96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363388
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Commit-Queue: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800218}

chrome/android/feed/core/java/src/org/chromium/chrome/browser/feed/v2/FeedStreamSurface.java

@@ -23,6 +23,7 @@
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.NativeMethods;
 import org.chromium.base.task.PostTask;
+import org.chromium.base.task.TaskTraits;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.AppHooks;
 import org.chromium.chrome.browser.feed.shared.ScrollTracker;
@@ -250,6 +251,23 @@ public void logError(String tag, String format, Object... args) {
         public void logWarning(String tag, String format, Object... args) {
             Log.w(tag, format, args);
         }
+
+        @Override
+        public void postTask(int taskType, Runnable task, long delayMs) {
+            TaskTraits traits;
+            switch (taskType) {
+                case ProcessScopeDependencyProvider.TASK_TYPE_UI_THREAD:
+                    traits = UiThreadTaskTraits.DEFAULT;
+                    break;
+                case ProcessScopeDependencyProvider.TASK_TYPE_BACKGROUND_MAY_BLOCK:
+                    traits = TaskTraits.BEST_EFFORT_MAY_BLOCK;
+                    break;
+                default:
+                    assert false : "Invalid task type";
+                    return;
+            }
+            PostTask.postDelayedTask(traits, task, delayMs);
+        }
     }
 
     /**

chrome/browser/xsurface/android/java/src/org/chromium/chrome/browser/xsurface/ProcessScopeDependencyProvider.java

@@ -46,4 +46,18 @@ default void logWarning(String tag, String messageTemplate, Object... args) {}
     default ImageFetchClient getImageFetchClient() {
         return null;
     }
+
+    // Posts task to the UI thread.
+    int TASK_TYPE_UI_THREAD = 1;
+    // Posts to a background thread. The task may block.
+    int TASK_TYPE_BACKGROUND_MAY_BLOCK = 2;
+
+    /**
+     * Runs task on a Chrome executor, see PostTask.java.
+     *
+     * @param taskType Type of task to run. Determines which thread and what priority is used.
+     * @param task The task to run
+     * @param delayMs The delay before executing the task in milliseconds.
+     */
+    default void postTask(int taskType, Runnable task, long delayMs) {}
 }