[Android] Allow text handles to observe position of "parent" view

content/public/android/java/src/org/chromium/content/browser/input/SelectionHandleController.java

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser.input;
 
 import android.view.View;
 
 import com.google.common.annotations.VisibleForTesting;
 
+import org.chromium.content.browser.PositionObserver;
+
 /**
  * CursorController for selecting a range of text.
  */
 public abstract class SelectionHandleController implements CursorController {
 
     // The following constants match the ones in
     // third_party/WebKit/public/web/WebTextDirection.h
     private static final int TEXT_DIRECTION_DEFAULT = 0;
     private static final int TEXT_DIRECTION_LTR = 1;
     private static final int TEXT_DIRECTION_RTL = 2;
 
     /** The cursor controller images, lazily created when shown. */
     private HandleView mStartHandle, mEndHandle;
 
     /** Whether handles should show automatically when text is selected. */
     private boolean mAllowAutomaticShowing = true;
 
     /** Whether selection anchors are active. */
     private boolean mIsShowing;
 
     private View mParent;
 
     private int mFixedHandleX;
     private int mFixedHandleY;
 
-    public SelectionHandleController(View parent) {
+    private PositionObserver mPositionObserver;
+
+    public SelectionHandleController(View parent, PositionObserver positionObserver) {
         mParent = parent;
+        mPositionObserver = positionObserver;
     }
 
     /** Automatically show selection anchors when text is selected. */
     public void allowAutomaticShowing() {
         mAllowAutomaticShowing = true;
     }
 
     /** Hide selection anchors, and don't automatically show them. */
     public void hideAndDisallowAutomaticShowing() {
         hide();
@@ skipping 135 matching lines @@
     }
 
     @VisibleForTesting
     public HandleView getEndHandleViewForTest() {
         return mEndHandle;
     }
 
     private void createHandlesIfNeeded(int startDir, int endDir) {
         if (mStartHandle == null) {
             mStartHandle = new HandleView(this,
-                startDir == TEXT_DIRECTION_RTL ? HandleView.RIGHT : HandleView.LEFT, mParent);
+                    startDir == TEXT_DIRECTION_RTL ? HandleView.RIGHT : HandleView.LEFT, mParent,
+                    mPositionObserver);
         }
         if (mEndHandle == null) {
             mEndHandle = new HandleView(this,
-                endDir == TEXT_DIRECTION_RTL ? HandleView.LEFT : HandleView.RIGHT, mParent);
+                    endDir == TEXT_DIRECTION_RTL ? HandleView.LEFT : HandleView.RIGHT, mParent,
+                    mPositionObserver);
         }
     }
 
     private void showHandlesIfNeeded() {
         if (!mIsShowing) {
             mIsShowing = true;
             mStartHandle.show();
             mEndHandle.show();
             setHandleVisibility(HandleView.VISIBLE);
         }
     }
 }