Use Blink's flag to prevent fling boosting.

content/browser/android/content_view_core_impl.cc

 // Copyright 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/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 1004 matching lines @@
       WebInputEvent::GestureFlingStart, time_ms, x, y);
   event.data.flingStart.velocityX = vx / dpi_scale();
   event.data.flingStart.velocityY = vy / dpi_scale();
 
   SendGestureEvent(event);
 }
 
 void ContentViewCoreImpl::FlingCancel(JNIEnv* env, jobject obj, jlong time_ms) {
   WebGestureEvent event = MakeGestureEvent(
       WebInputEvent::GestureFlingCancel, time_ms, 0, 0);
+  event.data.flingCancel.preventBoosting = true;
+
   SendGestureEvent(event);
 }
 
 void ContentViewCoreImpl::SingleTap(JNIEnv* env, jobject obj, jlong time_ms,
                                     jfloat x, jfloat y) {
   // Tap gestures should always be preceded by a TapDown, ensuring consistency
   // with the touch-based gesture detection pipeline.
   WebGestureEvent tap_down_event = MakeGestureEvent(
       WebInputEvent::GestureTapDown, time_ms, x, y);
   tap_down_event.data.tap.tapCount = 1;
@@ skipping 303 matching lines @@
       reinterpret_cast<ui::WindowAndroid*>(window_android),
       retained_objects_set);
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content