Plumb gesture source value through Blink.

third_party/WebKit/Source/web/WebInputEventConversion.cpp

Index: third_party/WebKit/Source/web/WebInputEventConversion.cpp
diff --git a/third_party/WebKit/Source/web/WebInputEventConversion.cpp b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
index 96061fa86542a3ec8d4c6b69a52ecbc6c3c6c8d9..0f70d98234bc3f5bf94bce029b191efee363c2a0 100644
--- a/third_party/WebKit/Source/web/WebInputEventConversion.cpp
+++ b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
@@ -254,6 +254,16 @@ PlatformGestureEventBuilder::PlatformGestureEventBuilder(Widget* widget, const W
     m_globalPosition = IntPoint(e.globalX, e.globalY);
     m_timestamp = e.timeStampSeconds;
     m_modifiers = e.modifiers;
+    switch (e.sourceDevice) {
+    case WebGestureDeviceUninitialized:
+        m_source = PlatformGestureSourceUninitialized;
+        break;
+    case WebGestureDeviceTouchpad:
+        m_source = PlatformGestureSourceTouchpad;
+        break;
+    case WebGestureDeviceTouchscreen:
+        m_source = PlatformGestureSourceTouchscreen;
+    }
 }
 
 // MakePlatformKeyboardEvent --------------------------------------------------
@@ -704,6 +714,17 @@ WebGestureEventBuilder::WebGestureEventBuilder(const LayoutObject* layoutObject,
     IntPoint localPoint = convertAbsoluteLocationForLayoutObject(event.absoluteLocation(), *layoutObject);
     x = localPoint.x();
     y = localPoint.y();
+
+    switch (event.source()) {
+    case GestureSourceUninitialized:
+        sourceDevice = WebGestureDeviceUninitialized;
+        break;
+    case GestureSourceTouchpad:
+        sourceDevice = WebGestureDeviceTouchpad;
+        break;
+    case GestureSourceTouchscreen:
+        sourceDevice = WebGestureDeviceTouchscreen;
+    }
 }
 
 } // namespace blink