Implement support to consider <space> key as part of typeAhead searching.

Source/core/html/forms/TypeAhead.cpp

Index: Source/core/html/forms/TypeAhead.cpp
diff --git a/Source/core/html/forms/TypeAhead.cpp b/Source/core/html/forms/TypeAhead.cpp
index 4c2b1f8313be146d89cc758aaffbdae7d2a745c2..5f2d2767fbb6b507f3ef857bf75650283ffb195e 100644
--- a/Source/core/html/forms/TypeAhead.cpp
+++ b/Source/core/html/forms/TypeAhead.cpp
@@ -70,6 +70,7 @@ int TypeAhead::handleEvent(KeyboardEvent* event, MatchModeFlags matchMode)
 
     if (delta > typeAheadTimeout)
         m_buffer.clear();
+
     m_buffer.append(c);
 
     if (optionCount < 1)
@@ -119,4 +120,10 @@ int TypeAhead::handleEvent(KeyboardEvent* event, MatchModeFlags matchMode)
     return -1;
 }
 
+bool TypeAhead::hasActiveSession(KeyboardEvent* event)
+{
+    DOMTimeStamp delta = event->timeStamp() - m_lastTypeTime;
+    return delta <= typeAheadTimeout;
+}
+
 } // namespace blink