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

content/browser/renderer_host/input/synthetic_gesture_target_android.cc

Index: content/browser/renderer_host/input/synthetic_gesture_target_android.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_target_android.cc b/content/browser/renderer_host/input/synthetic_gesture_target_android.cc
index acaee85dd949a65891179f14b98806fb53f7c1c5..6590f00859c95a764b48ab62c714b9983fa1dd52 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_target_android.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_target_android.cc
@@ -5,8 +5,11 @@
 #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;
 
@@ -80,4 +83,10 @@ bool SyntheticGestureTargetAndroid::SupportsSyntheticGestureSourceType(
   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