Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_gesture_controller.h

Index: content/browser/renderer_host/input/synthetic_gesture_controller.h
diff --git a/content/browser/renderer_host/input/synthetic_gesture_controller.h b/content/browser/renderer_host/input/synthetic_gesture_controller.h
index 5a92f31edf4ff8de63ad723c3f370d5f155d33fa..bdd2fdde0abc5121e592b61e24be0e0cc3173b6b 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_controller.h
+++ b/content/browser/renderer_host/input/synthetic_gesture_controller.h
@@ -14,8 +14,10 @@
 #include "base/memory/scoped_vector.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
+#include "content/browser/renderer_host/input/synthetic_pointer_action_controller.h"
 #include "content/common/content_export.h"
 #include "content/common/input/synthetic_gesture_params.h"
+#include "content/common/input/synthetic_pointer_action_params.h"
 
 namespace content {
 
@@ -36,6 +38,10 @@ class CONTENT_EXPORT SyntheticGestureController {
       std::unique_ptr<SyntheticGesture> synthetic_gesture,
       const OnGestureCompleteCallback& completion_callback);
 
+  void QueueSyntheticPointerAction(
+      const SyntheticPointerActionParams& gesture_params,
+      const OnGestureCompleteCallback& completion_callback);
+
   // Forward input events of the currently processed gesture.
   void Flush(base::TimeTicks timestamp);
 
@@ -43,7 +49,11 @@ class CONTENT_EXPORT SyntheticGestureController {
   // fully flushed from the input pipeline (i.e., sent, processed and ack'ed).
   void OnDidFlushInput();
 
+  void ResetSyntheticPointer();
+
  private:
+  friend class TestSyntheticGestureController;
+
   void StartGesture(const SyntheticGesture& gesture);
   void StopGesture(const SyntheticGesture& gesture,
                    const OnGestureCompleteCallback& completion_callback,
@@ -51,6 +61,7 @@ class CONTENT_EXPORT SyntheticGestureController {
 
   std::unique_ptr<SyntheticGestureTarget> gesture_target_;
   std::unique_ptr<SyntheticGesture::Result> pending_gesture_result_;
+  SyntheticPointerActionController pointer_action_controller_;
 
   // A queue of gesture/callback pairs.  Implemented as two queues to
   // simplify the ownership of SyntheticGesture pointers.