Indicate whether a touch event will cause scrolling

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/android/build_info.h"
 #include "base/basictypes.h"
@@ skipping 687 matching lines @@
   if (!host_)
     return false;
 
   if (selection_controller_ &&
       selection_controller_->WillHandleTouchEvent(event))
     return true;
 
   if (gesture_text_selector_.OnTouchEvent(event))
     return true;
 
-  if (!gesture_provider_.OnTouchEvent(event))
+  auto result = gesture_provider_.OnTouchEvent(event);
+  if (!result.succeeded)
     return false;
 
   if (host_->ShouldForwardTouchEvent()) {
-    blink::WebTouchEvent web_event = CreateWebTouchEventFromMotionEvent(event);
+    blink::WebTouchEvent web_event =
+        CreateWebTouchEventFromMotionEvent(event, result.did_generate_scroll);
     host_->ForwardTouchEventWithLatencyInfo(web_event,
                                             CreateLatencyInfo(web_event));
   } else {
     const bool event_consumed = false;
     gesture_provider_.OnTouchEventAck(event_consumed);
   }
 
   // Send a proactive BeginFrame on the next vsync to reduce latency.
   // This is good enough as long as the first touch event has Begin semantics
   // and the actual scroll happens on the next vsync.
@@ skipping 1085 matching lines @@
   results->orientationAngle = display.RotationAsDegree();
   results->orientationType =
       RenderWidgetHostViewBase::GetOrientationTypeForMobile(display);
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 } // namespace content