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..79df17fe2b29f4cdac4b70d8ae947d7b982c54a9 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:

[tdresser, 2015/10/19 12:52:39]

Let's put the exceptional case at the end.

[wjmaclean, 2015/10/19 15:26:55]

Done.

+        ASSERT_NOT_REACHED();
+        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:

[tdresser, 2015/10/19 12:52:39]

ditto

[wjmaclean, 2015/10/19 15:26:55]

Done.

+        ASSERT_NOT_REACHED();
+        break;
+    case GestureSourceTouchpad:
+        sourceDevice = WebGestureDeviceTouchpad;
+        break;
+    case GestureSourceTouchscreen:
+        sourceDevice = WebGestureDeviceTouchscreen;
+    }
 }
 
 } // namespace blink