Fix the problem to keep the selection when clicking the substring out of range

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index b494da3325acd28ce3d7869fbb6448eaecd65c29..16851cb0ac8393e240784595329e74d44c15fb73 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -560,7 +560,7 @@ bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestR
             granularity = m_frame->selection().granularity();
             newSelection.expandUsingGranularity(m_frame->selection().granularity());
         }
-    } else {
+    } else if (m_selectionInitiationState != ExtendedSelection) {

[Donn Denman, 2014/12/09 00:59:37]

This line causes a problem for Contextual Search (a feature for Chrome on
Android).

         newSelection = expandSelectionToRespectUserSelectAll(innerNode, VisibleSelection(visiblePos));
     }
 
@@ -2986,7 +2986,8 @@ void EventHandler::notifyElementActivated()
 
 void EventHandler::notifySelectionChanged()
 {
-    m_selectionInitiationState = ExtendedSelection;
+    if (m_frame->selection().isRange())
+        m_selectionInitiationState = ExtendedSelection;
 }
 
 bool EventHandler::handleAccessKey(const PlatformKeyboardEvent& evt)