Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_gesture_target_base.cc

Index: content/browser/renderer_host/input/synthetic_gesture_target_base.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_target_base.cc b/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
index b6fed781dbefa194aef444f8597dace95ab94674..cb568bfac4a5a3c048cbb55a72132fead49c70d1 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_target_base.cc
@@ -56,13 +56,11 @@ void SyntheticGestureTargetBase::DispatchInputEventToPlatform(
         static_cast<const WebTouchEvent&>(event);
 
     // Check that all touch pointers are within the content bounds.
-    if (web_touch.type == WebInputEvent::TouchStart) {
-      for (unsigned i = 0; i < web_touch.touchesLength; i++)
-        CHECK(web_touch.touches[i].state != WebTouchPoint::StatePressed ||
-              PointIsWithinContents(web_touch.touches[i].position.x,
-                                    web_touch.touches[i].position.y))
-            << "Touch coordinates are not within content bounds on TouchStart.";
-    }
+    for (unsigned i = 0; i < web_touch.touchesLength; i++)
+      CHECK(web_touch.touches[i].state != WebTouchPoint::StatePressed ||
+            PointIsWithinContents(web_touch.touches[i].position.x,
+                                  web_touch.touches[i].position.y))
+          << "Touch coordinates are not within content bounds on TouchStart.";
 
     DispatchWebTouchEventToPlatform(web_touch, latency_info);
   } else if (event.type == WebInputEvent::MouseWheel) {