Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_gesture.h

Index: content/browser/renderer_host/input/synthetic_gesture.h
diff --git a/content/browser/renderer_host/input/synthetic_gesture.h b/content/browser/renderer_host/input/synthetic_gesture.h
index f880e5d66718a29fffaeefddb9c3e63c065b6b3f..90d49902470c606a8e52371dd01bf8d770455006 100644
--- a/content/browser/renderer_host/input/synthetic_gesture.h
+++ b/content/browser/renderer_host/input/synthetic_gesture.h
@@ -17,7 +17,7 @@ namespace content {
 class SyntheticGestureTarget;
 
 // Base class for synthetic gesture implementations. A synthetic gesture class
-// is responsible for forwaring InputEvents, simulating the gesture, to a
+// is responsible for forwarding InputEvents, simulating the gesture, to a
 // SyntheticGestureTarget.
 //
 // Adding new gesture types involved the following steps:
@@ -38,6 +38,9 @@ class CONTENT_EXPORT SyntheticGesture {
   enum Result {
     GESTURE_RUNNING,
     GESTURE_FINISHED,
+    // Received when the user input parameters for SyntheticPointerAction are
+    // invalid.
+    POINTER_ACTION_INPUT_INVALID,
     GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED,
     GESTURE_RESULT_MAX = GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED
   };