Support dragging texts into Android WebView.

content/public/android/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 
 content_jni_gypi_values = exec_script("//build/gypi_to_gn.py",
                                       [ rebase_path("../../content_jni.gypi") ],
                                       "scope",
@@ skipping 264 matching lines @@
     "//content/public/common/screen_orientation_values.h",
     "//content/public/common/speech_recognition_error.h",
     "//content/public/common/top_controls_state.h",
   ]
 }
 
 generate_jar_jni("jar_jni") {
   jni_package = "content"
   classes = [
     "java/util/HashSet.class",
+    "android/view/DragEvent.class",
     "android/view/MotionEvent.class",
   ]
 }
 
 generate_jni("content_jni_headers") {
   sources = rebase_path(content_jni_gypi_values.sources, "", "../..")
   jni_package = "content"
 }
 
 group("jni") {
@@ skipping 97 matching lines @@
     "junit/src/org/chromium/content/browser/input/TextInputStateTest.java",
     "junit/src/org/chromium/content/browser/input/ThreadedInputConnectionTest.java",
     "junit/src/org/chromium/content/browser/BindingManagerImplTest.java",
   ]
   deps = [
     ":content_java",
     "//base:base_java",
     "//base:base_java_test_support",
   ]
 }