Make empty selection behavior behave like Android EditText.

third_party/WebKit/Source/core/editing/SelectionController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 286 matching lines @@
     if (!innerNode || !innerNode->layoutObject())
         return;
 
     const VisiblePositionTemplate<Strategy> pos = createVisiblePosition(fromPositionInDOMTree<Strategy>(innerNode->layoutObject()->positionForPoint(result.localPoint())));
     if (pos.isNotNull()) {
         newSelection = VisibleSelectionTemplate<Strategy>(pos);
         newSelection.expandUsingGranularity(WordGranularity);
     }
 
 #if OS(ANDROID)
-    // If node is not editable and doesn't have text except space, tab or
-    // line break, do not select that 'empty' area.
-    if (!innerNode->hasEditableStyle()) {
-        EphemeralRangeTemplate<Strategy> range = EphemeralRangeTemplate<Strategy>(newSelection.start(), newSelection.end());
-        String str = plainText(range, TextIteratorDefaultBehavior);
-        if (str.isEmpty() || str.simplifyWhiteSpace().containsOnlyWhitespace())
-            return;
-    }
+    // If node doesn't have text except space, tab or line break, do not
+    // select that 'empty' area.
+    EphemeralRangeTemplate<Strategy> range = EphemeralRangeTemplate<Strategy>(newSelection.start(), newSelection.end());
+    String str = plainText(range, TextIteratorDefaultBehavior);

[yosin_UTC9, 2016/02/03 06:49:28]

nit: |const String&| to avoid unnecessary copy of |String|

+    if (str.isEmpty() || str.simplifyWhiteSpace().containsOnlyWhitespace())
+        return;
 #endif
 
     if (appendTrailingWhitespace == AppendTrailingWhitespace::ShouldAppend && newSelection.isRange())
         newSelection.appendTrailingWhitespace();
 
     updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), WordGranularity);
 }
 
 template <typename Strategy>
 void SelectionController::selectClosestMisspellingFromHitTestResult(const HitTestResult& result, AppendTrailingWhitespace appendTrailingWhitespace)
@@ skipping 353 matching lines @@
     else
         m_selectionState = SelectionState::HaveNotStartedSelection;
 }
 
 FrameSelection& SelectionController::selection() const
 {
     return m_frame->selection();
 }
 
 } // namespace blink