Support dragging texts out of webview/Chrome.

ui/android/view_android.cc

 // Copyright 2016 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 "ui/android/view_android.h"
 
 #include <algorithm>
 
 #include "base/android/jni_android.h"
 #include "cc/layers/layer.h"
+#include "ui/android/window_android.h"
+
 
 namespace ui {
 
-using base::android::AttachCurrentThread;
 using base::android::JavaRef;
-using base::android::ScopedJavaLocalRef;
 
 ViewAndroid::ViewAndroid(const JavaRef<jobject>& delegate,
                          WindowAndroid* root_window)
     : parent_(nullptr), window_(root_window), delegate_(delegate) {}
 
 ViewAndroid::ViewAndroid() : parent_(nullptr), window_(nullptr) {}
 
 ViewAndroid::~ViewAndroid() {
   if (parent_)
     parent_->RemoveChild(this);
@@ skipping 49 matching lines @@
 }
 
 cc::Layer* ViewAndroid::GetLayer() const {
   return layer_.get();
 }
 
 void ViewAndroid::SetLayer(scoped_refptr<cc::Layer> layer) {
   layer_ = layer;
 }
 
+void ViewAndroid::StartDragAndDrop(const JavaRef<jstring>& jtext,
+                                   const JavaRef<jobject>& jimage) {
+  WindowAndroid* window_android = GetWindowAndroid();
+  if (!window_android)
+    return;
+
+  window_android->StartDragAndDrop(GetViewAndroidDelegate(), jtext, jimage);
+}
+
 }  // namespace ui