[Android] Allow the intent to be cancelled.

showCancelableIntent() could be used to get a request code for
cancelIntent(int).

BUG=328205

Review URL: https://codereview.chromium.org/100173007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240823 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 29 insertions, 4 deletions

diff --git a/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java
index e5812df..342ba68 100644
--- a/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java
@@ -37,20 +37,25 @@ public class ActivityWindowAndroid extends WindowAndroid {
     }
 
     @Override
-    public boolean showIntent(Intent intent, IntentCallback callback, int errorId) {
+    public int showCancelableIntent(Intent intent, IntentCallback callback, int errorId) {
         int requestCode = REQUEST_CODE_PREFIX + mNextRequestCode;
         mNextRequestCode = (mNextRequestCode + 1) % REQUEST_CODE_RANGE_SIZE;
 
         try {
             mActivity.startActivityForResult(intent, requestCode);
         } catch (ActivityNotFoundException e) {
-            return false;
+            return -1;
         }
 
         mOutstandingIntents.put(requestCode, callback);
         mIntentErrors.put(requestCode, mApplicationContext.getString(errorId));
 
-        return true;
+        return requestCode;
+    }
+
+    @Override
+    public void cancelIntent(int requestCode) {
+        mActivity.finishActivity(requestCode);
     }
 
     @Override
diff --git a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
index 44469e5..90fbb68 100644
--- a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
@@ -53,8 +53,28 @@ public class WindowAndroid {
      * @return Whether the intent was shown.
      */
     public boolean showIntent(Intent intent, IntentCallback callback, int errorId) {
+        return showCancelableIntent(intent, callback, errorId) >= 0;
+    }
+
+    /**
+     * Shows an intent that could be canceled and returns the results to the callback object.
+     * @param intent The intent that needs to be showed.
+     * @param callback The object that will receive the results for the intent.
+     * @param errorId The ID of error string to be show if activity is paused before intent
+     *        results.
+     * @return A non-negative request code that could be used for finishActivity, or -1 if failed.
+     */
+    public int showCancelableIntent(Intent intent, IntentCallback callback, int errorId) {
         Log.d(TAG, "Can't show intent as context is not an Activity: " + intent);
-        return false;
+        return -1;
+    }
+
+    /**
+     * Force finish another activity that you had previously started with showCancelableIntent.
+     * @param requestCode The request code returned from showCancelableIntent.
+     */
+    public void cancelIntent(int requestCode) {
+        Log.d(TAG, "Can't cancel intent as context is not an Activity: " + requestCode);
     }
 
     /**