Make touch-based synthetic gesture take touch slop into account.

content/browser/renderer_host/input/synthetic_gesture_target_android.cc

 // Copyright 2013 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/input/synthetic_gesture_target_android.h"
 
 #include "content/browser/android/content_view_core_impl.h"
+#include "content/browser/renderer_host/render_widget_host_impl.h"
+#include "content/common/android/view_configuration.h"
 #include "jni/TouchEventSynthesizer_jni.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
+#include "ui/gfx/screen.h"
 
 using blink::WebTouchEvent;
 
 namespace content {
 
 SyntheticGestureTargetAndroid::SyntheticGestureTargetAndroid(
     RenderWidgetHostImpl* host,
     base::android::ScopedJavaLocalRef<jobject> touch_event_synthesizer)
     : SyntheticGestureTargetBase(host),
       touch_event_synthesizer_(touch_event_synthesizer) {
@@ skipping 53 matching lines @@
 SyntheticGestureParams::GestureSourceType
 SyntheticGestureTargetAndroid::GetDefaultSyntheticGestureSourceType() const {
   return SyntheticGestureParams::TOUCH_INPUT;
 }
 
 bool SyntheticGestureTargetAndroid::SupportsSyntheticGestureSourceType(
     SyntheticGestureParams::GestureSourceType gesture_source_type) const {
   return gesture_source_type == SyntheticGestureParams::TOUCH_INPUT;
 }
 
+int SyntheticGestureTargetAndroid::GetTouchSlopInDips() const {
+  float device_scale_factor =
+      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().device_scale_factor();
+  return ViewConfiguration::GetTouchSlopInPixels() / device_scale_factor;
+}
+
 }  // namespace content