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

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 137 matching lines @@
   return ContentViewCoreImpl::FromWebContents(web_contents);
 }
 
 // static
 ContentViewCore* ContentViewCore::GetNativeContentViewCore(JNIEnv* env,
                                                            jobject obj) {
   return reinterpret_cast<ContentViewCore*>(
       Java_ContentViewCore_getNativeContentViewCore(env, obj));
 }
 
+float ContentViewCoreImpl::GetDeviceScaleFactor() const {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
+  if (obj.is_null())
+    return 1.0f;
+  return Java_ContentViewCore_getDeviceScaleFactor(env, obj.obj());
+}
+
 ContentViewCoreImpl::ContentViewCoreImpl(JNIEnv* env, jobject obj,
                                          bool hardware_accelerated,
                                          WebContents* web_contents,
                                          ui::ViewAndroid* view_android,
                                          ui::WindowAndroid* window_android)
     : WebContentsObserver(web_contents),
       java_ref_(env, obj),
       web_contents_(static_cast<WebContentsImpl*>(web_contents)),
       root_layer_(cc::Layer::Create()),
       vsync_interval_(base::TimeDelta::FromMicroseconds(
@@ skipping 1468 matching lines @@
       reinterpret_cast<ui::ViewAndroid*>(view_android),
       reinterpret_cast<ui::WindowAndroid*>(window_android));
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content