Paste popup is positioning properly during content scroll.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

 // Copyright 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;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.SearchManager;
 import android.content.ClipboardManager;
@@ skipping 275 matching lines @@
 
     // Only valid when focused on a text / password field.
     private ImeAdapter mImeAdapter;
     private ImeAdapter.AdapterInputConnectionFactory mAdapterInputConnectionFactory;
     private AdapterInputConnection mInputConnection;
     private InputMethodManagerWrapper mInputMethodManagerWrapper;
 
     // Lazily created paste popup menu, triggered either via long press in an
     // editable region or from tapping the insertion handle.
     private PastePopupMenu mPastePopupMenu;
+    private boolean mWasPastePopupShowingOnInsertionDragStart;
 
     private PopupTouchHandleDrawableDelegate mTouchHandleDelegate;
 
     private PositionObserver mPositionObserver;
 
     // Size of the viewport in physical pixels as set from onSizeChanged.
     private int mViewportWidthPix;
     private int mViewportHeightPix;
     private int mPhysicalBackingWidthPix;
     private int mPhysicalBackingHeightPix;
@@ skipping 1896 matching lines @@
             case SelectionEventType.SELECTION_CLEARED:
                 mHasSelection = false;
                 mUnselectAllOnActionModeDismiss = false;
                 hideSelectActionBar();
                 break;
 
             case SelectionEventType.INSERTION_SHOWN:
                 mHasInsertion = true;
                 break;
 
-            case SelectionEventType.INSERTION_MOVED:
-                // TODO(jdduke): Handle case where movement triggered by focus.
+            case SelectionEventType.INSERTION_DRAG_STARTED:
+                mWasPastePopupShowingOnInsertionDragStart =
+                        mPastePopupMenu != null && mPastePopupMenu.isShowing();
                 hidePastePopup();
                 break;
 
+            case SelectionEventType.INSERTION_MOVED:
+                if (mPastePopupMenu == null) break;
+                if (!isScrollInProgress() && mPastePopupMenu.isShowing()) {
+                    showPastePopup((int) posXDip, (int) posYDip);
+                } else {
+                    hidePastePopup();
+                }
+                break;
+
             case SelectionEventType.INSERTION_TAPPED:
-                if (getPastePopup().isShowing())
-                    mPastePopupMenu.hide();
+                if (mWasPastePopupShowingOnInsertionDragStart)
+                    hidePastePopup();
                 else
                     showPastePopup((int) posXDip, (int) posYDip);
                 break;
 
             case SelectionEventType.INSERTION_CLEARED:
                 mHasInsertion = false;
                 hidePastePopup();
                 break;
 
             default:
@@ skipping 1094 matching lines @@
     private native void nativeSetBackgroundOpaque(long nativeContentViewCoreImpl, boolean opaque);
     private native void nativeSetupTransitionView(long nativeContentViewCoreImpl, String markup);
     private native void nativeBeginExitTransition(long nativeContentViewCoreImpl,
             String cssSelector);
 
     private native void nativeResumeResponseDeferredAtStart(
             long nativeContentViewCoreImpl);
     private native void nativeSetHasPendingNavigationTransitionForTesting(
             long nativeContentViewCoreImpl);
 }