Expose the timestamp associated with a user gesture, and make it possible to recreate a new user ge…

Source/platform/UserGestureIndicator.cpp

Index: Source/platform/UserGestureIndicator.cpp
diff --git a/Source/platform/UserGestureIndicator.cpp b/Source/platform/UserGestureIndicator.cpp
index dbebd06a9ddc724f81f454e1af6366d3c0ae55fb..b2899e171344a6af313534a0e0031dcd76b9bf30 100644
--- a/Source/platform/UserGestureIndicator.cpp
+++ b/Source/platform/UserGestureIndicator.cpp
@@ -64,6 +64,11 @@ public:
         m_timestamp = WTF::currentTime();
     }
 
+    void setTimestamp(double timestamp)
+    {
+        m_timestamp = timestamp;
+    }
+
     bool consumeGesture()
     {
         if (!m_consumableGestures)
@@ -88,6 +93,11 @@ public:
             m_javascriptPrompt = true;
     }
 
+    virtual double timestamp() const OVERRIDE
+    {
+        return m_timestamp;
+    }
+
 private:
     GestureToken()
         : m_consumableGestures(0),
@@ -167,6 +177,26 @@ UserGestureIndicator::UserGestureIndicator(PassRefPtr<UserGestureToken> token)
     ASSERT(isDefinite(s_state));
 }
 
+UserGestureIndicator::UserGestureIndicator(double timestamp)
+    : m_previousState(s_state)
+{
+    // Silently ignore UserGestureIndicators on non-main threads.
+    if (!isMainThread())
+        return;
+
+    if (!s_topmostIndicator) {
+        s_topmostIndicator = this;
+        m_token = GestureToken::create();
+    } else {
+        m_token = s_topmostIndicator->currentToken();
+    }
+    s_state = DefinitelyProcessingUserGesture;
+
+    static_cast<GestureToken*>(m_token.get())->addGesture();
+    static_cast<GestureToken*>(m_token.get())->setTimestamp(timestamp);
+    ASSERT(isDefinite(s_state));
+}
+
 UserGestureIndicator::~UserGestureIndicator()
 {
     if (!isMainThread())