Fix the scale of Drag and Drop shadow image.

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

Index: ui/android/java/src/org/chromium/ui/base/ViewAndroidDelegate.java
diff --git a/ui/android/java/src/org/chromium/ui/base/ViewAndroidDelegate.java b/ui/android/java/src/org/chromium/ui/base/ViewAndroidDelegate.java
index aca3a8fe2db019187d19ff5c6ef0123c1ca2c0ae..6c0e8cb1c130c6fbb6ce1c29697ef2f9653c131d 100644
--- a/ui/android/java/src/org/chromium/ui/base/ViewAndroidDelegate.java
+++ b/ui/android/java/src/org/chromium/ui/base/ViewAndroidDelegate.java
@@ -89,7 +89,7 @@ public abstract class ViewAndroidDelegate {
     // TODO(hush): uncomment below when we build with API 24.
     // @TargetApi(Build.VERSION_CODES.N)
     @CalledByNative
-    private boolean startDragAndDrop(String text, Bitmap shadowImage) {
+    private boolean startDragAndDrop(String text, Bitmap shadowImage, float pageScale) {
         if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) return false;
 
         ViewGroup containerView = getContainerView();
@@ -97,7 +97,10 @@ public abstract class ViewAndroidDelegate {
 
         ImageView imageView = new ImageView(containerView.getContext());
         imageView.setImageBitmap(shadowImage);
-        imageView.layout(0, 0, shadowImage.getWidth(), shadowImage.getHeight());
+        // The width and height of shadowImage are already normalized by DIP scale. Now we just
+        // need to normalize it by page scale.
+        imageView.layout(0, 0, (int) (shadowImage.getWidth() * pageScale),
+                (int) (shadowImage.getHeight() * pageScale));
 
         // TODO(hush): use View#startDragAndDrop when Chromium starts to build with API 24.
         return containerView.startDrag(ClipData.newPlainText(null, text),