Implement deleteItem and openItem on OfflinePageDownloadBridge.

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadBridge.java
index 428353e83d7a558081c4c6901eb47668b6b202bb..5a8771e68916bd88f5d26a544d56078dafe88be7 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadBridge.java
@@ -4,9 +4,15 @@
 
 package org.chromium.chrome.browser.offlinepages.downloads;
 
+import android.app.Activity;
+import android.content.Intent;
+import android.net.Uri;
+import android.provider.Browser;
+
 import org.chromium.base.ObserverList;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.profiles.Profile;
 
 import java.util.ArrayList;
@@ -97,12 +103,41 @@ public class OfflinePageDownloadBridge {
      * Gets a download item related to the provided GUID.
      * @param guid a GUID of the item to get.
      * @return download item related to the offline page identified by GUID.
-     * */
+     */
     public OfflinePageDownloadItem getItem(String guid) {
         return nativeGetItemByGuid(mNativeOfflinePageDownloadBridge, guid);
     }
 
     /**
+     * Schedules deletion of the offline page identified by the GUID.
+     * If the item is still in the process of download, the download is canceled.
+     * Actual cancel and/or deletion happens asynchronously, Observer is notified when it's done.
+     * @param guid a GUID of the item to delete.
+     */
+    public void deleteItem(String guid) {
+        nativeDeleteItemByGuid(mNativeOfflinePageDownloadBridge, guid);
+    }
+
+    /**
+     * 'Opens' the offline page identified by the GUID.
+     * This is done by creating a new tab and navigating it to the saved local snapshot.
+     * No automatic redirection is happening based on the connection status.
+     * If the item with specified GUID is not found or can't be opened, nothing happens.
+     * @param guid a GUID of the item to open.
+     * @param activity Activity requesting to open the item (offline page).
+     */
+    public void openItem(String guid, Activity activity) {
+        String url = nativeGetOfflineUrlByGuid(
+                mNativeOfflinePageDownloadBridge, guid);
+        if (url.isEmpty()) return;
+        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+        intent.putExtra(Browser.EXTRA_APPLICATION_ID,
+                activity.getApplicationContext().getPackageName());
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        IntentHandler.startActivityForTrustedIntent(intent, activity);
+    }
+
+    /**
      * Method to ensure that the bridge is created for tests without calling the native portion of
      * initialization.
      * @param isTesting flag indicating whether the constructor will initialize native code.
@@ -163,4 +198,8 @@ public class OfflinePageDownloadBridge {
             long nativeOfflinePageDownloadBridge, List<OfflinePageDownloadItem> items);
     native OfflinePageDownloadItem nativeGetItemByGuid(
             long nativeOfflinePageDownloadBridge, String guid);
+    native void nativeDeleteItemByGuid(
+            long nativeOfflinePageDownloadBridge, String guid);
+    native String nativeGetOfflineUrlByGuid(
+            long nativeOfflinePageDownloadBridge, String guid);
 }