Support dragging texts into Android WebView.

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index aab7ecafbd0a15b6bac63a572ac2387791c065a1..a8e07303f2d7a27459a8e309f790f30a6eed52c3 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -278,6 +278,27 @@ class ContentViewCoreImpl : public ContentViewCore,
   void SetBackgroundOpaque(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& jobj,
                            jboolean opaque);
+  void OnDragEntered(JNIEnv* env,
+                     const base::android::JavaParamRef<jobject>& jobj,
+                     int x,
+                     int y,
+                     int screen_x,
+                     int screen_y);
+  void OnDragUpdated(JNIEnv* env,
+                     const base::android::JavaParamRef<jobject>& jobj,
+                     int x,
+                     int y,
+                     int screen_x,
+                     int screen_y);
+  void OnPerformDrop(JNIEnv* env,
+                     const base::android::JavaParamRef<jobject>& jobj,
+                     int x,
+                     int y,
+                     int screen_x,
+                     int screen_y,
+                     const base::android::JavaParamRef<jstring>& content);
+  void OnDragExited(JNIEnv* env,
+                    const base::android::JavaParamRef<jobject>& jobj);
 
   jint GetCurrentRenderProcessId(
       JNIEnv* env,