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

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 6df0969e7f63b7aea34bffa68193d68262514912..021688fd64ef87536d4e22bf1f382d10f3e09cb1 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -3176,6 +3176,11 @@ public class ContentViewCore
         getContentViewClient().onGeometryChanged(playerId, new RectF(x, y, x + width, y + height));
     }
 
+    @CalledByNative
+    public float getDeviceScaleFactor() {
+        return mRenderCoordinates.getDeviceScaleFactor();
+    }
+
     /**
      * Offer a subset of gesture events to the embedding View,
      * primarily for WebView compatibility.