Support dragging texts out of webview/Chrome.

ui/android/java/src/org/chromium/ui/base/WindowAndroid.java

Index: ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
diff --git a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
index a848f2882d8d5b3649a9bdb1addea033ca7fe8d8..5d3d91326cd701a75dfa41a8b462b70004fbc8b8 100644
--- a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
@@ -15,6 +15,7 @@ import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.Intent;
 import android.content.pm.PackageManager;
+import android.graphics.Bitmap;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Process;
@@ -651,6 +652,15 @@ public class WindowAndroid {
         }
     }
 
+    /**
+     * Starts drag and drop operation on a ViewAndroid whose delegate is viewAndroidDelegate.
+     */
+    @CalledByNative
+    private void startDragAndDrop(
+            ViewAndroidDelegate viewAndroidDelegate, String text, Bitmap shadowImage) {
+        viewAndroidDelegate.startDragAndDrop(text, shadowImage);
+    }
+
     private native long nativeInit();
     private native void nativeOnVSync(long nativeWindowAndroid,
                                       long vsyncTimeMicros,