Adding handlers for user gesture callbacks.

Source/web/tests/WebUserGestureTokenTest.cpp

Index: Source/web/tests/WebUserGestureTokenTest.cpp
diff --git a/Source/web/tests/WebUserGestureTokenTest.cpp b/Source/web/tests/WebUserGestureTokenTest.cpp
index 0c39c39f1130759e29d2a3a4772e4a35a831a178..7ee19e3ab7ea5429e181a072f04c66b26e1613d6 100644
--- a/Source/web/tests/WebUserGestureTokenTest.cpp
+++ b/Source/web/tests/WebUserGestureTokenTest.cpp
@@ -42,6 +42,16 @@ using namespace WebCore;
 
 namespace {
 
+class GestureHandlerTest : public WebUserGestureHandler {
+public:
+    void onGesture()
+    {
+        m_reached = true;
+    }
+
+    bool m_reached = false;
+};
+
 TEST(WebUserGestureTokenTest, Basic)
 {
     WebUserGestureToken token;
@@ -74,6 +84,13 @@ TEST(WebUserGestureTokenTest, Basic)
         WebScopedUserGesture indicator(token);
         EXPECT_FALSE(WebUserGestureIndicator::isProcessingUserGesture());
     }
+
+    {
+        GestureHandlerTest handler;
+        WebUserGestureIndicator::setHandler(&handler);
+        UserGestureIndicator indicator(DefinitelyProcessingNewUserGesture);
+        EXPECT_TRUE(handler.m_reached);
+    }
 }
 
 }