Gate Android drag and drop feature with a flag.

content/browser/android/content_view_core_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 264 matching lines @@
   void ExtractSmartClipData(JNIEnv* env,
                             const base::android::JavaParamRef<jobject>& obj,
                             jint x,
                             jint y,
                             jint width,
                             jint height);
 
   void SetBackgroundOpaque(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& jobj,
                            jboolean opaque);
+
+  bool IsTouchDragDropEnabled(JNIEnv* env,
+                              const base::android::JavaParamRef<jobject>& jobj);
+
   void OnDragEvent(JNIEnv* env,
                    const base::android::JavaParamRef<jobject>& jobj,
                    jint action,
                    jint x,
                    jint y,
                    jint screen_x,
                    jint screen_y,
                    const base::android::JavaParamRef<jobjectArray>& j_mimeTypes,
                    const base::android::JavaParamRef<jstring>& j_content);
 
@@ skipping 185 matching lines @@
   scoped_refptr<GinJavaBridgeDispatcherHost> java_bridge_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentViewCoreImpl);
 };
 
 bool RegisterContentViewCore(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_