Wires up drags to pointer watcher adapter.

ui/views/pointer_watcher.h

Index: ui/views/pointer_watcher.h
diff --git a/ui/views/pointer_watcher.h b/ui/views/pointer_watcher.h
index 715ec130193bc51707283caa7f7247ab90549e6e..ab645e6b34851534e9cfc64de20d67d5249da251 100644
--- a/ui/views/pointer_watcher.h
+++ b/ui/views/pointer_watcher.h
@@ -19,6 +19,13 @@ class PointerEvent;
 namespace views {
 class Widget;
 
+// When pointer watchers are added they need to specify which events they want

[sky, 2016/08/31 23:27:39]

How about:

When a PointerWatcher is added the types of events desired is specified by way
of PointerWatcherEventTypes.

Then move the comments for each type above the enum values, e.g.:
// The PointerWatcher is interested in press, release, capture and mouse wheel.
BASIC,
// The PointerWatcher is interested in BASIC events, as well as move events.
...

[sammiequon, 2016/09/01 00:49:24]

Done.

+// to receive. BASIC means they receive only presses, releases, capture and
+// wheel events, MOVES means they receive move events in addition, and DRAGS
+// means
+// they receive move and drag events in addition.
+enum class PointerWatcherEventTypes { BASIC, MOVES, DRAGS };
+
 // An interface for read-only observation of pointer events (in particular, the
 // events cannot be marked as handled). Only certain event types are supported.
 // The |target| is the top-level widget that will receive the event, if any.