Make empty selection behavior behave like Android EditText.

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index caa1c48185b691f743e5a067f123be5e2555064c..e6eb23a536823ecf8c691e22078af60c14dc27e6 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -1250,6 +1250,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
                 mGestureStateListenersIterator.hasNext();) {
             mGestureStateListenersIterator.next().onSingleTap(consumed, x, y);
         }
+        hidePastePopup();
     }
 
     @SuppressWarnings("unused")
@@ -2241,6 +2242,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
                 } else {
                     showPastePopup(xAnchor, yAnchor);
                 }
+                mWasPastePopupShowingOnInsertionDragStart = false;
                 break;
 
             case SelectionEventType.INSERTION_HANDLE_CLEARED:
@@ -2255,6 +2257,11 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
                 break;
 
             case SelectionEventType.INSERTION_HANDLE_DRAG_STOPPED:
+                if (mWasPastePopupShowingOnInsertionDragStart) {
+                    showPastePopup(xAnchor, yAnchor);
+                }
+                mWasPastePopupShowingOnInsertionDragStart = false;
+                break;
             case SelectionEventType.SELECTION_ESTABLISHED:
             case SelectionEventType.SELECTION_DISSOLVED:
                 break;