Autofill address editor in PaymentRequest UI.

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorModel.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorModel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorModel.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorModel.java
index ca423c18660526e4b9d61391c158e2c009b85088..e96a3922a371c42c4ee2892f66727e86c22cf578 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorModel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorModel.java
@@ -48,6 +48,13 @@ public class EditorModel {
     }
 
     /**
+     * Removes all fields from the editor. The field contents are not altered.
+     */
+    public void removeAllFields() {
+        mFields.clear();
+    }
+
+    /**
      * Specifies the callback to invoke when the user clicks "Done."
      *
      * @param callback The callback to invoke when the user clicks "Done."
@@ -66,7 +73,8 @@ public class EditorModel {
     }
 
     /**
-     * Called when the user clicks "Done."
+     * Called when the user clicks "Done." Can be called only once. If this method is called, then
+     * cancel() should not be called.
      */
     public void done() {
         if (mDoneCallback != null) mDoneCallback.run();
@@ -75,7 +83,8 @@ public class EditorModel {
     }
 
     /**
-     * Called when the user clicks "Cancel."
+     * Called when the user clicks "Cancel." Can be called only once. If this method is called, then
+     * done() should not be called.
      */
     public void cancel() {
         if (mCancelCallback != null) mCancelCallback.run();